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<div dir="ltr" data-setdir="false">Thirty + years ago I modified a set of pop-up pistons made for a Chevy. I shaped the pop-up portion to fit into the combustion chamber of the TR cylinder head. This gave 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 .150" milled off the head.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">After I won The Runoffs in 1990, Cosworth contacted me and wanted to know what pistons I was using. They 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="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">The advantage of the pop-up design is that you don't have to mill as much off the head, thus extending cylinder head life. I suspect these Cosworth pistons may still be available through a Cosworth dealer. Perhaps someone on the FOT knows if these are still available.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Good luck.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jack Wheeler <br></div><div><br></div>
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On Tuesday, November 9, 2021, 09:05:33 AM EST, Erik Jacobsen via Fot <fot@autox.team.net> wrote:
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<div><div id="ydp44ab9334yiv6796105370"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydp44ab9334yiv6796105370yahoo-style-wrap"><div dir="ltr">Good morning FoT!</div><div dir="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 Crane 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="ltr">There seems to be very little info on what people are running for race pistons floating around on the net. </div><div dir="ltr"><br></div><div dir="ltr">Thanks!</div><div dir="ltr">Jake & Karen Jacobsen </div></div></div></div>_______________________________________________<br><a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive " rel="nofollow" target="_blank">http://autox.team.net/archive </a><a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com</a><br><br><br></div>
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