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

[Jim Gray]

Yeah I don’t think that’s gonna buff out.

 

From: Philip Gott <vfracing at aol.com> 
Sent: Tuesday, November 9, 2021 3:07 PM
To: Jim Gray <toodamnfunky at comcast.net>
Cc: Don Marshall <dmar823 at gmail.com>; yellow04 at tr4racer.com; fot at autox.team.net
Subject: Re: [Fot] pop up pistons for the TR2-4 engine ? RE: TR3 Race pistons and liners

 



Sent from my iPhone





On Nov 9, 2021, at 5:04 PM, Jim Gray via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote:



Either a catastrophic, nonlinear mechanical exasperation or a sudden un scheduled disassembly.

jg

From: Fot <fot-bounces at autox.team.net <mailto:fot-bounces at autox.team.net> > On Behalf Of Don Marshall via Fot
Sent: Tuesday, November 9, 2021 1:21 PM
To: yellow04 at tr4racer.com <mailto:yellow04 at tr4racer.com> 
Cc: Friends of Triumph <fot at autox.team.net <mailto:fot at autox.team.net> >
Subject: Re: [Fot] pop up pistons for the TR2-4 engine ? RE: TR3 Race pistons and liners

 

 

On Tue, Nov 9, 2021, 12:26 PM Henry Frye via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote:

A heck of a lot of races have been won by wet-liner TR's running pop-up 
pistons. And I'll bet none of them ever had a head collapse.

Just sayin'...

On 2021-11-09 11:44, Alexandre Camoletti via Fot wrote:
> 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).
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