[Fot] SCCA Archives

[WEmery7451 at aol.com]

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.