[Fot] FW: TR3 Race pistons and liners

[Jim Gray]

Jack,

I use the Wiseco pop ups for the same reason. I have a big investment in my head and so I didn’t want to mill it so far as to sacrifice reliability.

My last one cracked at a water jacket.

I use BFE supplied liners  ( LA Sleeve ).

jim g

 

From: Fot <fot-bounces at autox.team.net <mailto:fot-bounces at autox.team.net> > On Behalf Of Jack Wheeler via Fot
Sent: Tuesday, November 9, 2021 7:20 AM
To: Erik Jacobsen <kekjacobsen at yahoo.com <mailto:kekjacobsen at yahoo.com> >
Cc: FOT Triumph <fot at autox.team.net <mailto:fot at autox.team.net> >
Subject: Re: [Fot] TR3 Race pistons and liners

 

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.

 

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.

 

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.

 

Good luck.

 

Jack Wheeler  

 

On Tuesday, November 9, 2021, 09:05:33 AM EST, Erik Jacobsen via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote: 

 

 

Good morning FoT!

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. 

There seems to be very little info on what people are running for race pistons floating around on the net.  

 

Thanks!

Jake & Karen Jacobsen 

_______________________________________________
fot at autox.team.net <mailto:fot at autox.team.net> 

http://www.fot-racing.com

Donate: http://www.team.net/donate.html
Archive: http://autox.team.net/archive  <http://autox.team.net/archive%20> http://www.team.net/pipermail/fot
Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20211109/61598f3d/attachment-0003.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 190788 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/fot/attachments/20211109/61598f3d/attachment-0003.jpg>