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Thirty + years ago I modified a set of pop-up pistons made for a Chevy.=C2=
=A0 I shaped the pop-up portion to fit into the combustion chamber of the T=
R cylinder head.=C2=A0 This gave me higher compression without having to mi=
ll the head so much.=C2=A0 It was a long time ago, but I think I was runnin=
g 13.5:1 compression with .150" milled off the head.
After I won The Runoffs in 1990, Cosworth contacted me and wanted to know w=
hat pistons I was using.=C2=A0 They asked if they could borrow one of my pi=
stons to use as a template for a pop-up piston for the TR engine.=C2=A0 In =
return, they gave me a set of new Cosworth pop-up pistons ready to install,=
without modification.
The advantage of the pop-up design is that you don't have to mill as much o=
ff the head, thus extending cylinder head life.=C2=A0 I suspect these Coswo=
rth pistons may still be available through a Cosworth dealer.=C2=A0 Perhaps=
someone on the FOT knows if these are still available.
Good luck.
Jack Wheeler=C2=A0=20
On Tuesday, November 9, 2021, 09:05:33 AM EST, Erik Jacobsen via Fot <f=
ot@autox.team.net> wrote: =20
=20
Good morning FoT!Karen and I are working on the TR3 race car, and are look=
ing for your advice on pistons and liners for it. We are attempting to buil=
d a (semi) streetable race motor for our 3. It has a Crane 244-310-8 cam, a=
nd the head has been ported and is running big valves, so we are figuring t=
he compression should be in the 10.5-11.5:1 range. It has H-beam rods and a=
worked crank, but we will still keep the revs under 6500 in an attempt to =
keep it all in one piece.=C2=A0There seems to be very little info on what p=
eople are running for race pistons floating around on the net.=C2=A0=C2=A0
Thanks!Jake & Karen Jacobsen=C2=A0_________________________________________=
______
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
yahoo.com
=20
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<html><head></head><body><div class=3D"ydp7d044596yahoo-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">Thirty + years ago I modifie=
d a set of pop-up pistons made for a Chevy. I shaped the pop-up porti=
on to fit into the combustion chamber of the TR cylinder head. This g=
ave me higher compression without having to mill the head so much. It=
was a long time ago, but I think I was running 13.5:1 compression with .15=
0" milled off the head.</div><div dir=3D"ltr" data-setdir=3D"false"><br></d=
iv><div dir=3D"ltr" data-setdir=3D"false">After I won The Runoffs in 1990, =
Cosworth contacted me and wanted to know what pistons I was using. Th=
ey asked if they could borrow one of my pistons to use as a template for a =
pop-up piston for the TR engine. In return, they gave me a set of new=
Cosworth pop-up pistons ready to install, without modification.</div><div =
dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D=
"false">The advantage of the pop-up design is that you don't have to mill a=
s much off the head, thus extending cylinder head life. I suspect the=
se Cosworth pistons may still be available through a Cosworth dealer. =
Perhaps someone on the FOT knows if these are still available.</div><div d=
ir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"=
false">Good luck.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><di=
v dir=3D"ltr" data-setdir=3D"false">Jack Wheeler <br></div><div><br><=
/div>
=20
</div><div id=3D"ydp44ab9334yahoo_quoted_7123597973" class=3D"ydp44=
ab9334yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Tuesday, November 9, 2021, 09:05:33 AM EST, Erik Jac=
obsen via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydp44ab9334yiv6796105370"><div><div style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;" class=3D"ydp44ab9334yiv6796105370yahoo-style-wrap"><div dir=3D"ltr">Good=
morning FoT!</div><div dir=3D"ltr">Karen and I are working on the TR3 race=
car, and are looking for your advice on pistons and liners for it. We are =
attempting to build a (semi) streetable race motor for our 3. It has a Cran=
e 244-310-8 cam, and the head has been ported and is running big valves, so=
we are figuring the compression should be in the 10.5-11.5:1 range. It has=
H-beam rods and a worked crank, but we will still keep the revs under 6500=
in an attempt to keep it all in one piece. </div><div dir=3D"ltr">The=
re seems to be very little info on what people are running for race pistons=
floating around on the net. </div><div dir=3D"ltr"><br></div><d=
iv dir=3D"ltr">Thanks!</div><div dir=3D"ltr">Jake & Karen Jacobsen =
;</div></div></div></div>_______________________________________________<br=
><a href=3D"mailto:fot@autox.team.net"; rel=3D"nofollow" target=3D"_blank">f=
ot@autox.team.net</a><br><br><a href=3D"http://www.fot-racing.com"; rel=3D"n=
ofollow" target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
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am.net/archive " rel=3D"nofollow" target=3D"_blank">http://autox.team.net/a=
rchive </a><a href=3D"http://www.team.net/pipermail/fot"; rel=3D"nofollow" t=
arget=3D"_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manag=
e: <a href=3D"http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.=
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ns/fot/jwheeler1947@yahoo.com</a><br><br><br></div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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