[Fot] SCCA Archives

[Marx Christian tr4-racing]

I have seen a 92mm TR 4 on the track .... very close to unbeatable.

Chris

----- Original Message -----
From: "Kas Kastner" <kaskas at cox.net>
To: "Bill Babcock" <BillB at bnj.com>; <WEmery7451 at aol.com>
Cc: <FOT at 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 at aol.com
>   Cc: FOT at 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 at aol.com wrote:
>
>   > In a message dated 12/22/06 6:40:41 PM Pacific Standard Time,
>   > jaboruch at 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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