Subject: [Fot] Collective wisdom

From: Chuck Gee via Fot <[email-masked]>
Date: Tue, 20 Jan 2026 15:26:41 -0500

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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 fi=
rewall that functions as the high spot in the system.  This tank feeds the t=
op of the radiator but doesn=E2=80=99t really circulate during operation.  I=
=E2=80=99ve been thinking of plumbing the feed off of the back of the head i=
nto the top of the tank so that it circulates. =20

Normally this rear head feed is plumbed to the back of the water pump.  In a=
n exercise of overthinking, I=E2=80=99m not sure if there will be sufficient=
 circulation since the tank is plumbed to the radiator.  Does it matter?  Wh=
at is the collective wisdom?

Here are some pictures to help illustrate.

Thanks,

Chuck

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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: Chuck Gee via Fot <[email-masked]>
Date: Wed, 21 Jan 2026 08:31:45 -0500

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Thanks to everyone for your input! &nbsp;I a=
ppreciate it. &nbsp;See you at the track this year!<div><br id=3D"lineBreakA=
tBeginningOfSignature"><div dir=3D"ltr">Chuck Gee</div><div dir=3D"ltr"><br>=
<blockquote type=3D"cite">On Jan 21, 2026, at 12:38=E2=80=AFAM, JS Performan=
ce Motoring, LLC via Fot &lt;[email-masked]&gt; wrote:<br><br></blockquo=
te></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr=
"><div>An overflow tank does not flow.</div><div>A header tank or surge tank=
 does flow, and helps burp any steam or air pockets that are trapped in the e=
ngine.&nbsp;&nbsp;</div><div><br></div><div>Two different approaches.&nbsp; I=
 prefer the latter, but many are successfully running the simpler overflow t=
ank setup.</div><div><br></div><div><br></div><div>Jason Sukey</div><div><di=
v dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><=
div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D=
"ltr"><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">[email-masked]</a><br></div><div><a hre=
f=3D"http://www.jspmparts.com" target=3D"_blank">www.jspmparts.com</a></div>=
<div><a href=3D"https://www.facebook.com/JSPerformanceMotoring/" target=3D"_=
blank">https://www.facebook.com/JSPerformanceMotoring/</a><br></div></div></=
div></div></div></div></div></div><br></div><br><div class=3D"gmail_quote gm=
ail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 20, 2=
026 at 9:12=E2=80=AFPM Scott Janzen via Fot &lt;<a href=3D"mailto:fot@autox.=
team.net">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div dir=3D"auto">I=E2=80=99ve never understood ov=
erflow tanks to need =E2=80=9Cflow=E2=80=9D. Plz correct me if I=E2=80=99m w=
rong, but i thought they were there just to provide for the expansion and co=
ntraction of coolant when heated, etc<br id=3D"m_3139223990580268867lineBrea=
kAtBeginningOfSignature"><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D=
"ltr"><br><blockquote type=3D"cite">On Jan 20, 2026, at 6:31=E2=80=AFPM, vfr=
acing--- via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank"=
>[email-masked]</a>&gt; wrote:<br><br></blockquote></div><blockquote typ=
e=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div style=3D"font-family:arial;font-si=
ze:16px"><div></div>
        <div dir=3D"ltr">Chuck;</div><div dir=3D"ltr"><br></div><div dir=3D"=
ltr">That heater core port on the back of the head provides flow to an other=
wise blind spot in the head over an exhaust valve.&nbsp; On a race car witho=
ut flow 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=
 pump, 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"><br></div><div dir=3D"ltr">&nbsp;Note that bl=
ocking that flow on a street-driven 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"><br></div><div dir=3D"ltr">Hope this helps.</div><div dir=3D=
"ltr"><br></div><div dir=3D"ltr">Phil</div><div dir=3D"ltr"><br></div><div d=
ir=3D"ltr"><br></div><div><br></div>
       =20
        </div><div id=3D"m_3139223990580268867yahoo_quoted_9332275551"><div s=
tyle=3D"font-family:arial;font-size:16px">
            <div style=3D"font-family:&quot;Helvetica Neue&quot;,Helvetica,A=
rial,sans-serif;font-size:13px;color:rgb(38,40,42)">
               =20
                <div>
                        On Tuesday, January 20, 2026 at 04:16:51 PM EST, Chu=
ck Gee via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">f=
[email-masked]</a>&gt; wrote:
                    </div>
                </div><div style=3D"font-family:&quot;Helvetica Neue&quot;,H=
elvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42);border-left:1px=
 solid rgb(204,204,204);padding-left:8px;margin:0px 0px 0px 8px">
                <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 has a=
 header tank mounted to the firewall that functions as the high spot in the s=
ystem.&nbsp; This tank feeds the top of the radiator but doesn=E2=80=99t rea=
lly 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 ci=
rculates.&nbsp; <br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Normal=
ly 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 be sufficient c=
irculation since the tank is plumbed to the radiator.&nbsp; Does it matter?&=
nbsp; What is the collective wisdom?<br></div><div dir=3D"ltr"><br></div><di=
v 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 dir=3D"ltr"><br></div=
><div dir=3D"ltr">Chuck<br></div><div dir=3D"ltr"><br></div><br>____________=
___________________________________<br><a href=3D"mailto:[email-masked]"=
 target=3D"_blank">[email-masked]</a><br><br><a href=3D"http://www.fot-r=
acing.com" target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a=
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<br>
</blockquote></div>
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