[Fot] pop up pistons for the TR2-4 engine ? RE: TR3 Race pistons and liners

[Alexandre Camoletti]

Gents, 

I recall, but I may be mistaken, that Kas wrote in one of his books that he had experimented pop up pistons but because of the specific shape of the TR2-4 combustion chambers the pop up design was detrimental to the propagation of the flame front and actually this was offsetting the compression gain, so he abandoned this route to remain on the traditional milling one (with thin steel headgasket, which can make quite an additional difference).

 

De : Fot [mailto:fot-bounces at autox.team.net] De la part de Mike Harmuth via Fot
Envoyé : mardi 9 novembre 2021 15:26
À : Erik Jacobsen
Cc : FOT Triumph
Objet : Re: [Fot] TR3 Race pistons and liners

 

I don't know what size jugs you have on the engine but I came across these new Venolia TR pistons on E-Bay the other day. The shop selling them has gotten some bad press since the original owner moved on but it looks like they're in the process of selling off old inventory and these seem like a good price. I bought a set of Venolia Spitfire pistons from them yesterday and they're on the way.

NFI, just passing this on

 

https://www.ebay.com/itm/384398239541?hash=item597feba735:g:fxIAAOSwUYVheVG5

 

mike h

 

On Tue, Nov 9, 2021 at 9:05 AM Erik Jacobsen via Fot <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 

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