I have seen a 92mm TR 4 on the track .... very close to unbeatable.
Chris
----- Original Message -----
From: "Kas Kastner" <kaskas@cox.net>
To: "Bill Babcock" <BillB@bnj.com>; <WEmery7451@aol.com>
Cc: <FOT@autox.team.net>
Sent: Saturday, December 23, 2006 8:49 PM
Subject: Re: [Fot] SCCA Archives
> Easy to calculate how much more power from the big oversize's. Figure
about
> 1.2 horsepower for each cubic inch increase. Not nuts on accurate, but
close
> enough for holiday gripping.
>
> Never Be beaten by Equipment
> Kas Kastner
> ----- Original Message -----
> From: Bill Babcock
> To: WEmery7451@aol.com
> Cc: FOT@autox.team.net
> Sent: Saturday, December 23, 2006 11:36 AM
> Subject: Re: [Fot] SCCA Archives
>
>
> As I understand, the standard TR3 is 83 mm, the TR3B (some) are 86,
> the TR4 is 87, and there are lots of 87.5 MM and 89 mm piston and
> sleeve kits available, in fact they seem to be the prevalent
> replacement. If I were building a street TR3 (which I sort of am) I'd
> use the 89 mm and a mild cam, no head shaving, just a bit of porting.
> It would make a very nice motor.
>
> The block is fine for 89mm liners, if you want to go to the 92mm then
> you need to have the block machined. And yes, those are available. I
> think Gillanders has them, and probably others too.
>
> On Dec 22, 2006, at 8:58 PM, WEmery7451@aol.com wrote:
>
> > In a message dated 12/22/06 6:40:41 PM Pacific Standard Time,
> > jaboruch@netzero.net writes:
> >
> > << I am using 87mm, but since I am racing SCCA that is the max that
> > is legal
> > for EP. I have a set of custom made Ross 89mm pistons that I used
> > one year
> > with SCCA Vintage. They are nice pistons, but one has a valve
> > stemed size hole
> > thru the dome. Too expensive to have 1 made to fix the set, so
> > they will just
> > sit on the shelf till I get tired of looking at them. Joe(B) >>
> >
> > I guess that my engine is presently legal since it has the 87 mm
> > Cosworth
> > popup pistons. Down through the years, it seems that most people
> > using the flat
> > dome Heppolite pistons were secretly adding on 0.030" or 0.040" to
> > the 87 mm
> > pistons.
> >
> > I have always taken stock liners and a block to my machinist. He
> > clamps the
> > liners into the block, and bores them to the proper size for the
> > pistons. For
> > much larger pistons, I guess that special larger bore liners would
> > have to be
> > purchased, and that the liner holes in the block would have to be
> > enlarged.
> >
> > <>
> >
> > Isn't this the size of one of the stock pistons? The TR-3 and TR-4
> > manuals
> > list a few different sizes of pistons, from the earliest to the
> > latest.
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