Subject: Re: [Fot] Collective wisdom

From: Michael Moore via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 21:19:55 +0000

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: "JS Performance Motoring, LLC via Fot" <[email-masked]>
Date: Tue, 20 Jan 2026 16:19:44 -0500

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  Chuck,  the header tank setup I have used on GT6's and Spitfires has two
feeds to the top of the tank:  One from the thermostat housing (or top of
the rad), and the other from the rear of the head as you are considering.
To encourage some circulation, the bottom of the header tank should be
plumbed to the suction side of the system:  backside of water pump housing,
or the bottom of the rad.

I mostly use 1/4" lines for this, trying to somewhat limit the amount of
flow to "just enough".

Jason Sukey
JS Performance Motoring, LLC
440.984.7720
[email-masked]
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/

On Tue, Jan 20, 2026 at 4:13=E2=80=AFPM Chuck Gee via Fot <[email-masked]=
et>
wrote:

> Hello all,
>
> In an effort to constantly improve the car, I=E2=80=99ve been looking at =
the
> cooling system on my TR4.  It currently has a header tank mounted to the
> firewall that functions as the high spot in the system.  This tank feeds
> the top of the radiator but doesn=E2=80=99t really circulate during opera=
tion.
> I=E2=80=99ve been thinking of plumbing the feed off of the back of the he=
ad into
> the top of the tank so that it circulates.
>
> Normally this rear head feed is plumbed to the back of the water pump.  I=
n
> an exercise of overthinking, I=E2=80=99m not sure if there will be suffic=
ient
> circulation since the tank is plumbed to the radiator.  Does it matter?
> What is the collective wisdom?
>
> Here are some pictures to help illustrate.
>
> Thanks,
>
> Chuck
>
>
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/[email-masked]
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>
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<div dir=3D"ltr"><div>=C2=A0 Chuck,=C2=A0 the header tank setup I have used=
 on GT6&#39;s and Spitfires has two feeds to the top of the tank:=C2=A0 One=
 from the thermostat housing (or top of the rad), and the other from the re=
ar of the head as you are considering.=C2=A0 To encourage some circulation,=
 the bottom of the header tank should be plumbed to the suction side of the=
 system:=C2=A0 backside of water pump=C2=A0housing, or the bottom of the ra=
d.<div><br></div><div>I mostly use 1/4&quot; lines for this, trying to some=
what limit the amount of flow to &quot;just enough&quot;.</div></div><div><=
br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><=
div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature=
"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"=
ltr"><div dir=3D"ltr"><div>Jason Sukey</div><div><span></span><span></span>=
JS Performance Motoring, LLC<br></div><div>440.984.7720</div><div><a href=
=3D"mailto:[email-masked]" target=3D"_blank">jason@jsperfo=
rmancemotoring.com</a><br></div><div><a href=3D"http://www.jspmparts.com" t=
arget=3D"_blank">www.jspmparts.com</a></div><div><a href=3D"https://www.fac=
ebook.com/JSPerformanceMotoring/" target=3D"_blank">https://www.facebook.co=
m/JSPerformanceMotoring/</a><br></div></div></div></div></div></div></div><=
/div></div></div><br></div><br><div class=3D"gmail_quote gmail_quote_contai=
ner"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 20, 2026 at 4:13=E2=
=80=AFPM Chuck Gee via Fot &lt;<a href=3D"mailto:[email-masked]">fot@au=
tox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">Hello all,<br>
<br>
In an effort to constantly improve the car, I=E2=80=99ve been looking at th=
e cooling system on my TR4.=C2=A0 It currently has a header tank mounted to=
 the firewall that functions as the high spot in the system.=C2=A0 This tan=
k feeds the top of the radiator but doesn=E2=80=99t really circulate during=
 operation.=C2=A0 I=E2=80=99ve been thinking of plumbing the feed off of th=
e back of the head into the top of the tank so that it circulates.=C2=A0 <b=
r>
<br>
Normally this rear head feed is plumbed to the back of the water pump.=C2=
=A0 In an exercise of overthinking, I=E2=80=99m not sure if there will be s=
ufficient circulation since the tank is plumbed to the radiator.=C2=A0 Does=
 it matter?=C2=A0 What is the collective wisdom?<br>
<br>
Here are some pictures to help illustrate.<br>
<br>
Thanks,<br>
<br>
Chuck<br>
<br>
<br>
_______________________________________________<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com" rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive" rel=3D"noreferrer" targe=
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et/pipermail/fotUnsubscribe/Manage" rel=3D"noreferrer" target=3D"_blank">ht=
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p://autox.team.net/mailman/options/fot/[email-masked]</a><=
br>
<br>
<br>
</blockquote></div>

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From: Michael Moore via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 21:22:31 +0000

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From: vfracing--- via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 22:03:18 +0000 (UTC)

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 Chuck;
That heater core port on the back of the head provides flow to an otherwise=
 blind spot in the head over an exhaust valve. =C2=A0On a race car without =
flow through that port it could lead to early exhaust valve failure. =C2=A0=
The best way to ensure flow is to plumb it to the intake side of the water =
pump, set up as if there were a heater installed. =C2=A0We control the flow=
 by using a 5/16 line, providing some flow but not overly bypassing anythin=
g. =C2=A0
=C2=A0Note that blocking that flow on a street-driven engine is OK as the e=
xhaust valve is not overly stressed during street driving compared to what =
we do on-track!
Hope this helps.
Phil

    On Tuesday, January 20, 2026 at 04:16:51 PM EST, Chuck Gee via Fot <fot=
@autox.team.net> wrote:  =20

 Hello all,

e back of the head into the top of the tank so that it circulates.=C2=A0=20

Normally this rear head feed is plumbed to the back of the water pump.=C2=
=A0 In an exercise of overthinking, I=E2=80=99m not sure if there will be s=
ufficient circulation since the tank is plumbed to the radiator.=C2=A0 Does=
 it matter?=C2=A0 What is the collective wisdom?

Thanks,

Chuck

com

 =20
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<html><head></head><body><div class=3D"ydp223f9f02yahoo-style-wrap" style=
=3D"font-family:arial;font-size:16px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Chuck;</div><div dir=3D"ltr"=
 data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Tha=
t heater core port on the back of the head provides flow to an otherwise bl=
ind spot in the head over an exhaust valve. &nbsp;On a race car without flo=
w through that port it could lead to early exhaust valve failure. &nbsp;The=
 best way to ensure flow is to plumb it to the intake side of the water pum=
p, set up as if there were a heater installed. &nbsp;We control the flow by=
 using a 5/16 line, providing some flow but not overly bypassing anything. =
&nbsp;</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"lt=
r" data-setdir=3D"false">&nbsp;Note that blocking that flow on a street-dri=
ven engine is OK as the exhaust valve is not overly stressed during street =
driving compared to what we do on-track!</div><div dir=3D"ltr" data-setdir=
=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Hope this helps=
.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" da=
ta-setdir=3D"false">Phil</div><div dir=3D"ltr" data-setdir=3D"false"><br></=
div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div><br></div>
       =20
        </div><div id=3D"yahoo_quoted_9332275551" class=3D"yahoo_quoted"><d=
iv class=3D"yahoo-style-wrap" style=3D"font-family:arial;font-size:16px;">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div class=3D"quoted-text-header">
                        On Tuesday, January 20, 2026 at 04:16:51 PM EST, Ch=
uck Gee via Fot &lt;[email-masked]&gt; wrote:
                    </div>
                </div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"inline_reply_quote_co=
ntainer">
                <div><br></div><div><br></div>
                <div><div dir=3D"ltr">Hello all,<br></div><div dir=3D"ltr">=
<br></div><div dir=3D"ltr">In an effort to constantly improve the car, I=E2=
=80=99ve been looking at the cooling system on my TR4.&nbsp; It currently h=
as a header tank mounted to the firewall that functions as the high spot in=
 the system.&nbsp; This tank feeds the top of the radiator but doesn=E2=80=
=99t really circulate during operation.&nbsp; I=E2=80=99ve been thinking of=
 plumbing the feed off of the back of the head into the top of the tank so =
that it circulates.&nbsp; <br></div><div dir=3D"ltr"><br></div><div dir=3D"=
ltr">Normally this rear head feed is plumbed to the back of the water pump.=
&nbsp; In an exercise of overthinking, I=E2=80=99m not sure if there will b=
e sufficient circulation since the tank is plumbed to the radiator.&nbsp; D=
oes it matter?&nbsp; What is the collective wisdom?<br></div><div dir=3D"lt=
r"><br></div><div dir=3D"ltr">Here are some pictures to help illustrate.<br=
></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Thanks,<br></div><div di=
r=3D"ltr"><br></div><div dir=3D"ltr">Chuck<br></div><div dir=3D"ltr"><br></=
div><br>_______________________________________________<br><a ymailto=3D"ma=
ilto:[email-masked]" href=3D"mailto:[email-masked]">[email-masked].=
net</a><br><br><a href=3D"http://www.fot-racing.com" target=3D"_blank">http=
://www.fot-racing.com</a><br><br>Donate: <a href=3D"http://www.team.net/don=
ate.html" target=3D"_blank">http://www.team.net/donate.html</a><br>Archive:=
 <a href=3D"http://autox.team.net/archive" target=3D"_blank">http://autox.t=
eam.net/archive</a> <a href=3D"http://www.team.net/pipermail/fot" target=3D=
"_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a hr=
ef=3D"http://autox.team.net/mailman/options/fot/[email-masked]" target=3D=
"_blank">http://autox.team.net/mailman/options/fot/[email-masked]</a><br>=
<br><br></div>
            </div>
        </div></div></body></html>
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From: Tony Drews via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 16:47:21 -0600

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I'm not saying it's a good idea or a bad idea, but just be aware that 
the water in the head (and block) is at a higher pressure than the water 
in the radiator.  If you have, say, a 12 psi cap on the header tank and 
it's plumbed to the head it may overflow.

We discovered that on Jack's car when he put a radiator cap on top of 
the thermostat housing so he could fill from the high point.  We ended 
up blocking off the overflow there and just using the one on the 
radiator itself for that purpose.  The radiator cap on the t-stat 
housing made filling the car with water a breeze after that.

Cheers, Tony Drews

On 1/20/2026 3:19 PM, Michael Moore via Fot wrote:
>
> Chuck, I have mine plumbed the way you mentioned, it really helped 
> with my overheating, then added a new radiator last year and now I 
> have no problems.
>
> Have a Good Day
>
> Mike
>
> Michael T. Moore, CPA
>
> 3255 West 26^th Street
>
> Erie, PA 16506
>
> Phone: 814-616-8652  ext 100
>
> Fax: 888-865-5279
>
>
> This electronic mail message contains confidential and legally 
> privileged information intended only for the use of the recipient. If 
> the reader of this message is not the intended recipient, the reader 
> is hereby notified that any dissemination, distribution, copying or 
> other use of this message is strictly prohibited and is hereby 
> instructed to notify the sender immediately by return email and 
> destroy this copy of this message.
>
> *From:*Fot <[email-masked]> *On Behalf Of *Chuck Gee via Fot
> *Sent:* Tuesday, January 20, 2026 3:27 PM
> *To:* of Triumph Friends <[email-masked]>
> *Subject:* [Fot] Collective wisdom
>
> Hello all,
>
> In an effort to constantly improve the car, I’ve been looking at the 
> cooling system on my TR4.  It currently has a header tank mounted to 
> the firewall that functions as the high spot in the system.  This tank 
> feeds the top of the radiator but doesn’t really circulate during 
> operation.  I’ve been thinking of plumbing the feed off of the back of 
> the head into the top of the tank so that it circulates.
>
> Normally this rear head feed is plumbed to the back of the water 
> pump.  In an exercise of overthinking, I’m not sure if there will be 
> sufficient circulation since the tank is plumbed to the radiator.  
> Does it matter?  What is the collective wisdom?
>
> Unsubscribe/Manage: 
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
> Donate:http://www.team.net/donate.html
> Archive:http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:http://autox.team.net/mailman/options/fot/[email-masked]
>
>
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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p>I'm not saying it's a good idea or a bad idea, but just be aware
      that the water in the head (and block) is at a higher pressure
      than the water in the radiator.  If you have, say, a 12 psi cap on
      the header tank and it's plumbed to the head it may overflow.</p>
    <p>We discovered that on Jack's car when he put a radiator cap on
      top of the thermostat housing so he could fill from the high
      point.  We ended up blocking off the overflow there and just using
      the one on the radiator itself for that purpose.  The radiator cap
      on the t-stat housing made filling the car with water a breeze
      after that.</p>
    <p>Cheers, Tony Drews</p>
    <div class="moz-cite-prefix">On 1/20/2026 3:19 PM, Michael Moore via
      Fot wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
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      <div class="WordSection1">
        <p class="MsoNormal"><span style="font-size:11.0pt">Chuck, I
            have mine plumbed the way you mentioned, it really helped
            with my overheating, then added a new radiator last year and
            now I have no problems.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <div>
          <p class="MsoNormal"><span
style="font-family:&quot;PPC Handwriting&quot;;color:#006600;mso-ligatures:standardcontextual">Have
              a Good Day</span><span
style="font-size:11.0pt;font-family:&quot;PPC Handwriting&quot;;color:#006600"><o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-family:&quot;PPC Handwriting&quot;;color:#006600;mso-ligatures:standardcontextual">Mike<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-family:&quot;Calibri&quot;,sans-serif;color:#006600;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">Michael
              T. Moore, CPA<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">3255
              West 26<sup>th</sup> Street</span><span
style="font-size:11.0pt;color:#006600;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">Erie,
              PA 16506<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">Phone: 
              814-616-8652  ext 100<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">Fax:       
              888-865-5279<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual">Email:   
              <a href="mailto:[email-masked]"
                moz-do-not-send="true"><span style="color:#0563C1">[email-masked]</span></a><o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="color:#006600;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
          <p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.0pt;font-family:&quot;Times New Roman&quot;,serif;color:black;mso-ligatures:standardcontextual">This
              electronic mail message contains confidential and legally
              privileged information intended only for the use of the
              recipient. If the reader of this message is not the
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              dissemination, distribution, copying or other use of this
              message is strictly prohibited and is hereby instructed to
              notify the sender immediately by return email and destroy
              this copy of this message.<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#006600;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
          <p class="MsoNormal"><span
              style="mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
        </div>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <div>
          <div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> Fot
                <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a>
                <b>On Behalf Of </b>Chuck Gee via Fot<br>
                <b>Sent:</b> Tuesday, January 20, 2026 3:27 PM<br>
                <b>To:</b> of Triumph Friends <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a><br>
                <b>Subject:</b> [Fot] Collective wisdom<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <div>
            <p class="MsoNormal" style="margin-bottom:12.0pt"><span
                style="font-size:11.0pt">Hello all,<br>
                <br>
                In an effort to constantly improve the car, I’ve been
                looking at the cooling system on my TR4.  It currently
                has a header tank mounted to the firewall that functions
                as the high spot in the system.  This tank feeds the top
                of the radiator but doesn’t really circulate during
                operation.  I’ve been thinking of plumbing the feed off
                of the back of the head into the top of the tank so that
                it circulates. 
                <br>
                <br>
                Normally this rear head feed is plumbed to the back of
                the water pump.  In an exercise of overthinking, I’m not
                sure if there will be sufficient circulation since the
                tank is plumbed to the radiator.  Does it matter?  What
                is the collective wisdom?<br>
                <br>
                Here are some pictures to help illustrate.<br>
                <br>
                Thanks,<br>
                <br>
                Chuck<o:p></o:p></span></p>
          </div>
        </div>
        <div>
          <p class="MsoNormal"><img border="0" width="480" height="640"
              style="width:5.0in;height:6.6666in" id="Picture_x0020_2"
              src="cid:[email-masked]" class=""><o:p></o:p></p>
        </div>
        <div>
          <p class="MsoNormal"><img border="0" width="480" height="640"
              style="width:5.0in;height:6.6666in" id="Picture_x0020_1"
              src="cid:[email-masked]" class=""><o:p></o:p></p>
        </div>
        <div>
          <div>
            <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
          </div>
        </div>
        <div>
          <div>
            <p class="MsoNormal" style="margin-bottom:12.0pt"><span
                style="font-size:11.0pt">_______________________________________________<br>
                <a href="mailto:[email-masked]"
                  moz-do-not-send="true" class="moz-txt-link-freetext">[email-masked]</a><br>
                <br>
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                  moz-do-not-send="true" class="moz-txt-link-freetext">http://www.fot-racing.com</a><br>
                <br>
                Donate: <a href="http://www.team.net/donate.html"
                  moz-do-not-send="true" class="moz-txt-link-freetext">http://www.team.net/donate.html</a><br>
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                  moz-do-not-send="true" class="moz-txt-link-freetext">http://autox.team.net/archive</a>
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                <br>
                <o:p></o:p></span></p>
          </div>
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      </div>
      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre wrap="" class="moz-quote-pre">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>

<a class="moz-txt-link-freetext" href="http://www.fot-racing.com">http://www.fot-racing.com</a>

Archive: <a class="moz-txt-link-freetext" href="http://autox.team.net/archive">http://autox.team.net/archive</a> <a class="moz-txt-link-freetext" href="http://www.team.net/pipermail/fot">http://www.team.net/pipermail/fot</a>

</pre>
    </blockquote>
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From: DAVE HOGYE via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 15:13:14 -0800 (PST)

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Hi Chuck,
Here's my setup.  I plumbed the tank in place of the heater.  So it circulates through the tank and back through the water pump housing.
The out going line from the tank passes through the battery box and turns to use the original heater line bulkhead fitting.  
I have never had a cooling issue with this.  My radiator has no filler cap.  I fill the system through the tank.  I have a air bleed petcock on the t-stat housing.  
Photos attached.

Best,
Dave H.
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From: Henry Frye via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 19:05:35 -0500

This is what has always worked for me. Plug the bypass ports on the 
water pump and thermostat housing. Install a plug in the back of the 
water pump housing for the pipe that fed the heater. The only hose off 
the water pump goes to the bottom of the radiator. Plug the head where 
the fitting goes for the heater, as shown in your picture.

On the TR2-4 engine, it is critical to block a few the coolant passages 
at the front of the head, and restrict the rest. Think tiny freeze 
plugs. Otherwise, the coolant barely circulates around the back of the 
engine, #4 will run significantly hotter than 1 - 3, so hot that 
localized steam bubbles will form. There was a thread on this here many 
years ago.

I used an oversized Griffin aluminum radiator in the 'gone but not 
forgotten' TR4 and the TR250. Runs so cool I have put a 185 degree 
thermostat in the car. The TR3 uses a stock sized Wizard aluminum 
radiator, I run a 165 degree thermostat in that one.

That's it. No header tank, no attempting to get flow out the back of the 
head from the heater port. I do use the petcock on the top of the 
thermostat housing trick to help bleed the system, that proved to be a 
nice addition to effectively fill the system with no drama.

Henry Frye
2026 KCup chair - Return to Mosport

On 2026-01-20 15:26, Chuck Gee via Fot wrote:
> Normally this rear head feed is plumbed to the back of the water pump.
>  In an exercise of overthinking, I’m not sure if there will be
> http://autox.team.net/mailman/options/fot/[email-masked]

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---

From: Joe Boruch via Fot <[email-masked]>
Date: Wed, 21 Jan 2026 00:15:13 +0000 (UTC)

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 I do not have a header tank, so I cannot help you with plumbing of that. =
=C2=A0I welded a fill port to the top of my thermostat housing (see attache=
d pic). =C2=A0It is the highest point on my cooling system. =C2=A0I also ha=
ve a 4AN line from the heater hose port and the back of the head running up=
 to the tsat by-pass port on the tstat housing. =C2=A0The fitting for the 4=
AN line is restricted down to 1/8 inch. =C2=A0This is to allow for venting =
and a small amount of circulation from the back of the head. =C2=A0JoeB

    On Tuesday, January 20, 2026 at 04:35:01 PM EST, Chuck Gee via Fot <fot=
@autox.team.net> wrote: =20
=20
 Hello all,

Thanks,

Chuck

o.com

 =20
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<html><head></head><body><div class=3D"ydpd3d0169cyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">I do not have a header tank,=
 so I cannot help you with plumbing of that. &nbsp;I welded a fill port to =
the top of my thermostat housing (see attached pic). &nbsp;It is the highes=
t point on my cooling system. &nbsp;I also have a 4AN line from the heater =
hose port and the back of the head running up to the tsat by-pass port on t=
he tstat housing. &nbsp;The fitting for the 4AN line is restricted down to =
1/8 inch. &nbsp;This is to allow for venting and a small amount of circulat=
ion from the back of the head. &nbsp;</div><div dir=3D"ltr" data-setdir=3D"=
false">JoeB</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=
=3D"ltr" data-setdir=3D"false"><br></div><div><br></div>
       =20
        </div><div id=3D"ydpc464c4a2yahoo_quoted_9386645244" class=3D"ydpc4=
64c4a2yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                        On Tuesday, January 20, 2026 at 04:35:01 PM EST, Ch=
uck Gee via Fot &lt;[email-masked]&gt; wrote:
                    </div>
                    <div><br></div>
                    <div><br></div>
               =20
               =20
                <div><div dir=3D"ltr">Hello all,<br></div><div dir=3D"ltr">=
<br></div><div dir=3D"ltr">In an effort to constantly improve the car, I=E2=
=80=99ve been looking at the cooling system on my TR4.&nbsp; It currently h=
as a header tank mounted to the firewall that functions as the high spot in=
 the system.&nbsp; This tank feeds the top of the radiator but doesn=E2=80=
=99t really circulate during operation.&nbsp; I=E2=80=99ve been thinking of=
 plumbing the feed off of the back of the head into the top of the tank so =
that it circulates.&nbsp; <br></div><div dir=3D"ltr"><br></div><div dir=3D"=
ltr">Normally this rear head feed is plumbed to the back of the water pump.=
&nbsp; In an exercise of overthinking, I=E2=80=99m not sure if there will b=
e sufficient circulation since the tank is plumbed to the radiator.&nbsp; D=
oes it matter?&nbsp; What is the collective wisdom?<br></div><div dir=3D"lt=
r"><br></div><div dir=3D"ltr">Here are some pictures to help illustrate.<br=
r=3D"ltr"><br></div><div dir=3D"ltr">Chuck<br></div><div dir=3D"ltr"><br></=
div><br>_______________________________________________<br><a href=3D"mailt=
o:[email-masked]" rel=3D"nofollow" target=3D"_blank">[email-masked]=
</a><br><br><a href=3D"http://www.fot-racing.com" rel=3D"nofollow" target=
=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a href=3D"http://=
www.team.net/donate.html" rel=3D"nofollow" target=3D"_blank">http://www.tea=
m.net/donate.html</a><br>Archive: <a href=3D"http://autox.team.net/archive"=
 rel=3D"nofollow" target=3D"_blank">http://autox.team.net/archive</a> <a hr=
ef=3D"http://www.team.net/pipermail/fot" rel=3D"nofollow" target=3D"_blank"=
>http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href=3D"ht=
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o.com</a><br><br><br></div>
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From: Bob Kramer via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 19:11:14 -0600

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Chuck

I have mine plumbed in from the back of the water pump housing using the
OEM pipe, through the same tank in the same location and flows through to
the back of the head. I have to use at least a 21-23 lb cap on it. I run an
overflow line from the neck to a small catch bottle where the washer bottle
was located. Works great except when it doesn't, and then the
overflow bottle starts spraying smelling water at me.

Bob

On Tue, Jan 20, 2026 at 6:55=E2=80=AFPM Tony Drews via Fot <[email-masked].=
net>
wrote:

> I'm not saying it's a good idea or a bad idea, but just be aware that the
> water in the head (and block) is at a higher pressure than the water in t=
he
> radiator.  If you have, say, a 12 psi cap on the header tank and it's
> plumbed to the head it may overflow.
>
> We discovered that on Jack's car when he put a radiator cap on top of the
> thermostat housing so he could fill from the high point.  We ended up
> blocking off the overflow there and just using the one on the radiator
> itself for that purpose.  The radiator cap on the t-stat housing made
> filling the car with water a breeze after that.
>
> Cheers, Tony Drews
> Chuck, I have mine plumbed the way you mentioned, it really helped with m=
y
> overheating, then added a new radiator last year and now I have no proble=
ms.
> 3255 West 26th Street
> Email:    [email-masked]
>
>
>
> This electronic mail message contains confidential and legally privileged
> information intended only for the use of the recipient. If the reader of
> this message is not the intended recipient, the reader is hereby notified
> that any dissemination, distribution, copying or other use of this messag=
e
> is strictly prohibited and is hereby instructed to notify the sender
> immediately by return email and destroy this copy of this message.
>
>
>
>
>
>
>
> *From:* Fot <[email-masked]> <[email-masked]> *On
> Behalf Of *Chuck Gee via Fot
> *To:* of Triumph Friends <[email-masked]> <[email-masked]>
the
tion.
ad into
n
ient
> [email-masked]
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/tony@tonydr=
ews.com
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
>

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<div dir=3D"ltr">Chuck<div><br></div><div>I have mine plumbed in from the b=
ack of the water pump housing using the OEM pipe, through the same tank in =
the same location and flows through to the back of the head. I have to use =
at least a 21-23 lb cap on it. I run an overflow line from the neck to a sm=
all catch bottle where the washer bottle was located. Works great except wh=
en it doesn&#39;t, and then the overflow=C2=A0bottle starts spraying smelli=
ng water at me.=C2=A0</div><div><br></div><div>Bob</div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 20, 202=
6 at 6:55=E2=80=AFPM Tony Drews via Fot &lt;<a href=3D"mailto:[email-masked]=
m.net" target=3D"_blank">[email-masked]</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><u></u>

 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF">
    <p>I&#39;m not saying it&#39;s a good idea or a bad idea, but just be a=
ware
      that the water in the head (and block) is at a higher pressure
      than the water in the radiator.=C2=A0 If you have, say, a 12 psi cap =
on
      the header tank and it&#39;s plumbed to the head it may overflow.</p>
    <p>We discovered that on Jack&#39;s car when he put a radiator cap on
      top of the thermostat housing so he could fill from the high
      point.=C2=A0 We ended up blocking off the overflow there and just usi=
ng
      the one on the radiator itself for that purpose.=C2=A0 The radiator c=
ap
      on the t-stat housing made filling the car with water a breeze
      after that.</p>
    <p>Cheers, Tony Drews</p>
    <div>On 1/20/2026 3:19 PM, Michael Moore via
      Fot wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
     =20
     =20
     =20
      <div>
        <p class=3D"MsoNormal"><span style=3D"font-size:11pt">Chuck, I
            have mine plumbed the way you mentioned, it really helped
            with my overheating, then added a new radiator last year and
            now I have no problems.<u></u><u></u></span></p>
        <p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0=
<u></u></span></p>
        <div>
          <p class=3D"MsoNormal"><span style=3D"font-family:&quot;PPC Handw=
riting&quot;;color:rgb(0,102,0)">Have
              a Good Day</span><span style=3D"font-size:11pt;font-family:&q=
uot;PPC Handwriting&quot;;color:rgb(0,102,0)"><u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"font-family:&quot;PPC Handw=
riting&quot;;color:rgb(0,102,0)">Mike<u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-se=
rif;color:rgb(0,102,0)"><u></u>=C2=A0<u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">Michael
              T. Moore, CPA<u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">3255
              West 26<sup>th</sup> Street</span><span style=3D"font-size:11=
pt;color:rgb(0,102,0)"><u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">Erie,
              PA 16506<u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)"><u></u>=
=C2=A0<u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">Phone:=
=C2=A0
              814-616-8652=C2=A0 ext 100<u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">Fax:=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
              888-865-5279<u></u><u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)">Email:=
=C2=A0=C2=A0=C2=A0
              <a href=3D"mailto:[email-masked]" target=3D"_blank"><s=
pan style=3D"color:rgb(5,99,193)">[email-masked]</span></a><u></u><u=
></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"color:rgb(0,102,0)"><u></u>=
=C2=A0<u></u></span></p>
          <p class=3D"MsoNormal"><span style=3D"font-size:9pt;font-family:&=
quot;Times New Roman&quot;,serif;color:black">This
              electronic mail message contains confidential and legally
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              recipient. If the reader of this message is not the
              intended recipient, the reader is hereby notified that any
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              notify the sender immediately by return email and destroy
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          <p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:=
Calibri,sans-serif;color:rgb(0,102,0)"><u></u>=C2=A0<u></u></span></p>
          <p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
        </div>
        <p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0=
<u></u></span></p>
        <div>
          <div style=3D"border-right:none;border-bottom:none;border-left:no=
ne;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
            <p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif">From:</span></b><span style=3D"font-size:11pt;font=
-family:Calibri,sans-serif"> Fot
                <a href=3D"mailto:[email-masked]" target=3D"_bl=
ank">&lt;[email-masked]&gt;</a>
                <b>On Behalf Of </b>Chuck Gee via Fot<br>
                <b>Sent:</b> Tuesday, January 20, 2026 3:27 PM<br>
                <b>To:</b> of Triumph Friends <a href=3D"mailto:[email-masked]=
eam.net" target=3D"_blank">&lt;[email-masked]&gt;</a><br>
                <b>Subject:</b> [Fot] Collective wisdom<u></u><u></u></span=
></p>
          </div>
        </div>
        <p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
        <div>
          <div>
            <p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=
=3D"font-size:11pt">Hello all,<br>
                <br>
                In an effort to constantly improve the car, I=E2=80=99ve be=
en
                looking at the cooling system on my TR4.=C2=A0 It currently
                has a header tank mounted to the firewall that functions
                as the high spot in the system.=C2=A0 This tank feeds the t=
op
                of the radiator but doesn=E2=80=99t really circulate during
                operation.=C2=A0 I=E2=80=99ve been thinking of plumbing the=
 feed off
                of the back of the head into the top of the tank so that
                it circulates.=C2=A0
                <br>
                <br>
                Normally this rear head feed is plumbed to the back of
                the water pump.=C2=A0 In an exercise of overthinking, I=E2=
=80=99m not
                sure if there will be sufficient circulation since the
                tank is plumbed to the radiator.=C2=A0 Does it matter?=C2=
=A0 What
                is the collective wisdom?<br>
                <br>
                Here are some pictures to help illustrate.<br>
                <br>
                Thanks,<br>
                <br>
                Chuck<u></u><u></u></span></p>
          </div>
        </div>
        <div>
          <p class=3D"MsoNormal"><img border=3D"0" width=3D"480" height=3D"=
640" style=3D"width: 5in; height: 6.6666in;" id=3D"m_-4247720036447667129m_=
-3829200829039483647Picture_x0020_2" src=3D"cid:ii_19bde117d784ce8e91"><u><=
/u><u></u></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><img border=3D"0" width=3D"480" height=3D"=
640" style=3D"width: 5in; height: 6.6666in;" id=3D"m_-4247720036447667129m_=
-3829200829039483647Picture_x0020_1" src=3D"cid:ii_19bde117d785b006a2"><u><=
/u><u></u></p>
        </div>
        <div>
          <div>
            <p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></p>
          </div>
        </div>
        <div>
          <div>
            <p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=
=3D"font-size:11pt">_______________________________________________<br>
                <a href=3D"mailto:[email-masked]" target=3D"_blank">fot=
@autox.team.net</a><br>
                <br>
                <a href=3D"http://www.fot-racing.com" target=3D"_blank">htt=
p://www.fot-racing.com</a><br>
                <br>
                Donate: <a href=3D"http://www.team.net/donate.html" target=
=3D"_blank">http://www.team.net/donate.html</a><br>
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=3D"_blank">http://autox.team.net/archive</a>
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                <br>
                <u></u><u></u></span></p>
          </div>
        </div>
      </div>
      <br>
      <fieldset></fieldset>
      <pre>_______________________________________________
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a>

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//www.team.net/donate.html</a>
Archive: <a href=3D"http://autox.team.net/archive" target=3D"_blank">http:/=
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[email-masked]" target=3D"_blank">http://autox.team.net/mailman/options/f=
ot/[email-masked]</a>

</pre>
    </blockquote>
  </div>
t/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.te=
am.net/mailman/options/fot/[email-masked]</a><br>
<br>
<br>
</blockquote></div>

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