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

From: Alexandre Camoletti via Fot <[email-masked]>
Date: Tue, 9 Nov 2021 17:44:38 +0100

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Gents,=20

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).

=20

De : Fot [mailto:[email-masked]] De la part de Mike Harmuth =
via Fot
Envoy=C3=A9 : mardi 9 novembre 2021 15:26
=C3=80 : Erik Jacobsen
Cc : FOT Triumph
Objet : Re: [Fot] TR3 Race pistons and liners

=20

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

=20

https://www.ebay.com/itm/384398239541?hash=3Ditem597feba735:g:fxIAAOSwUYV=
heVG5

=20

mike h

=20

On Tue, Nov 9, 2021 at 9:05 AM Erik Jacobsen via Fot =
<[email-masked]> 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.=20

There seems to be very little info on what people are running for race =
pistons floating around on the net. =20

=20

Thanks!

Jake & Karen Jacobsen=20

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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:12.5pt;font-family:"Garamond","serif"'>Gents, =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:12.5pt;font-family:"Garamond","serif"'>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).<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:12.5pt;font-family:"Garamond","serif"'><o:p>&nbsp;</o:=
p></span></p><p class=3DMsoNormal><b><span lang=3DFR =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De&nbsp;:</s=
pan></b><span lang=3DFR =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Fot =
[mailto:[email-masked]] <b>De la part de</b> Mike Harmuth =
via Fot<br><b>Envoy=C3=A9&nbsp;:</b> mardi 9 novembre 2021 =
15:26<br><b>=C3=80&nbsp;:</b> Erik Jacobsen<br><b>Cc&nbsp;:</b> FOT =
Triumph<br><b>Objet&nbsp;:</b> Re: [Fot] TR3 Race pistons and =
liners<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>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&nbsp;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.<o:p></o:p></p><div><p =
class=3DMsoNormal>NFI, just passing this on<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><a =
href=3D"https://www.ebay.com/itm/384398239541?hash=3Ditem597feba735:g:fxI=
AAOSwUYVheVG5">https://www.ebay.com/itm/384398239541?hash=3Ditem597feba73=
5:g:fxIAAOSwUYVheVG5</a><o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>mike h<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Tue, Nov 9, 2021 at 9:05 AM Erik Jacobsen via Fot &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'>Good morning =
FoT!<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'>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.&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'>There seems to be very =
little info on what people are running for race pistons floating around =
on the net.&nbsp;&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'><o:p>&nbsp;</o:p></span></=
p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'>Thanks!<o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif"'>Jake &amp; Karen =
Jacobsen&nbsp;<o:p></o:p></span></p></div></div></div><p =
class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
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