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An overflow tank does not flow.
A header tank or surge tank does flow, and helps burp any steam or air
pockets that are trapped in the engine.
Two different approaches. I prefer the latter, but many are successfully
running the simpler overflow tank setup.
Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason@jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/
On Tue, Jan 20, 2026 at 9:12=E2=80=AFPM Scott Janzen via Fot <fot@autox.tea=
m.net>
wrote:
> I=E2=80=99ve never understood overflow tanks to need =E2=80=9Cflow=E2=80=
=9D. Plz correct me if I=E2=80=99m
> wrong, but i thought they were there just to provide for the expansion an=
d
> contraction of coolant when heated, etc
> Sent from my iPhone
>
> On Jan 20, 2026, at 6:31=E2=80=AFPM, vfracing--- via Fot <fot@autox.team.=
net>
> wrote:
>
> =EF=BB=BF
> 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. On a race car
> without flow through that port it could lead to early exhaust valve
> failure. The best way to ensure flow is to plumb it to the intake side o=
f
> the water pump, set up as if there were a heater installed. We control t=
he
> flow by using a 5/16 line, providing some flow but not overly bypassing
> anything.
>
> Note that blocking that flow on a street-driven engine is OK as the
> exhaust valve is not overly stressed during street driving compared to wh=
at
> 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:
>
>
> 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
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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>
>
>
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<div dir=3D"ltr"><div>An overflow tank does not flow.</div><div>A header ta=
nk or surge tank does flow, and helps burp any steam or air pockets that ar=
e trapped in the engine.=C2=A0=C2=A0</div><div><br></div><div>Two different=
approaches.=C2=A0 I prefer the latter, but many are successfully running t=
he simpler overflow tank setup.</div><div><br></div><div><br></div><div>Jas=
on Sukey</div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmai=
l=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><d=
iv dir=3D"ltr"><div dir=3D"ltr"><div><span></span><span></span>JS Performan=
ce Motoring, LLC<br></div><div>440.984.7720</div><div><a href=3D"mailto:jas=
on@jsperformancemotoring.com" target=3D"_blank">jason@jsperformancemotoring=
.com</a><br></div><div><a href=3D"http://www.jspmparts.com"; target=3D"_blan=
k">www.jspmparts.com</a></div><div><a href=3D"https://www.facebook.com/JSPe=
rformanceMotoring/" target=3D"_blank">https://www.facebook.com/JSPerformanc=
eMotoring/</a><br></div></div></div></div></div></div></div></div><br></div=
><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Tue, Jan 20, 2026 at 9:12=E2=80=AFPM Scott Janzen via F=
ot <<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"=
auto">I=E2=80=99ve never understood overflow tanks to need =E2=80=9Cflow=E2=
=80=9D. Plz correct me if I=E2=80=99m wrong, but i thought they were there =
just to provide for the expansion and contraction of coolant when heated, e=
tc<br id=3D"m_3139223990580268867lineBreakAtBeginningOfSignature"><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, vfracing--- via Fot <<a href=
=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net</a>>=
wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr=
">=EF=BB=BF<div style=3D"font-family:arial;font-size: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 oth=
erwise blind spot in the head over an exhaust valve.=C2=A0 On a race car wi=
thout 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=A0 We control t=
he flow by using a 5/16 line, providing some flow but not overly bypassing =
anything. =C2=A0</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">=C2=A0Not=
e that blocking that flow on a street-driven engine is OK as the exhaust va=
lve 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.</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Phil</div><div dir=3D"ltr"><=
br></div><div dir=3D"ltr"><br></div><div><br></div>
=20
</div><div id=3D"m_3139223990580268867yahoo_quoted_9332275551"><div=
style=3D"font-family:arial;font-size:16px">
<div style=3D"font-family:"Helvetica Neue",Helvetica,=
Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
=20
<div>
On Tuesday, January 20, 2026 at 04:16:51 PM EST, Ch=
uck Gee via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"=
>fot@autox.team.net</a>> wrote:
</div>
</div><div style=3D"font-family:"Helvetica Neue",=
Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42);border-left:1=
px 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.=C2=A0 It currently h=
as a header tank mounted to the firewall that functions as the high spot in=
the system.=C2=A0 This tank 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 the back of the head into the top of the tank so =
that it circulates.=C2=A0 <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.=
=C2=A0 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.=C2=A0 D=
oes it matter?=C2=A0 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 href=3D"mailt=
o:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a><br><br><a hr=
ef=3D"http://www.fot-racing.com"; target=3D"_blank">http://www.fot-racing.co=
m</a><br><br>Donate: <a href=3D"http://www.team.net/donate.html"; target=3D"=
_blank">http://www.team.net/donate.html</a><br>Archive: <a href=3D"http://a=
utox.team.net/archive" target=3D"_blank">http://autox.team.net/archive</a> =
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team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href=3D"http://autox.t=
eam.net/mailman/options/fot/vfracing@aol.com" target=3D"_blank">http://auto=
x.team.net/mailman/options/fot/vfracing@aol.com</a><br><br><br></div>
</div>
</div></div><span>_______________________________________________</=
span><br><span><a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@=
autox.team.net</a></span><br><span></span><br><span><a href=3D"http://www.f=
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pan></span><br><span>Donate: <a href=3D"http://www.team.net/donate.html"; ta=
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.com</a></span><br><span></span><br><span></span><br></div></blockquote></d=
iv>_______________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
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br>
<br>
<br>
</blockquote></div>
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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