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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! I a=
ppreciate it. 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 <fot@autox.team.net> 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. </div><div><br></div><div>Two different approaches. 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:jason@jsperformancemotoring.com=
" target=3D"_blank">jason@jsperformancemotoring.com</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 <<a href=3D"mailto:fot@autox.=
team.net">fot@autox.team.net</a>> 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 <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"=
>fot@autox.team.net</a>> 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. On a race car witho=
ut 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 of the water=
pump, set up as if there were a heater installed. We control the flow=
by using a 5/16 line, providing some flow but not overly bypassing anything=
. </div><div dir=3D"ltr"><br></div><div dir=3D"ltr"> 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:"Helvetica Neue",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 <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">f=
ot@autox.team.net</a>> wrote:
</div>
</div><div style=3D"font-family:"Helvetica Neue",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. It currently has a=
header tank mounted to the firewall that functions as the high spot in the s=
ystem. This tank feeds the top of the radiator but doesn=E2=80=99t rea=
lly circulate during operation. 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. <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. 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. 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:fot@autox.team.net"=
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<br><span></span><br><span></span><br></div></blockquote></div>_____________=
__________________________________<br>
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</blockquote></div>
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