Pelican Parts Forums - Question for you number guys out there.

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Plavan

12-29-2005 07:05 AM

Question for you number guys out there.

I am starting to build my back up race motor (2.5L long stroke this time). Since I am using a 2.4-2.7 crank and making up some new custom pistons this time, I have a question. The original 911 ST motors had 86.7mm pistons. VARA allows us to go 60 over.
My question is, how big of a piston can I run over the stock 86.7mm to take advantage of the 60 over rule? Keeping it legal :)

jpnovak

12-29-2005 08:53 AM

I assume 60 over is in thousandths. So 0.060" = 1.524mm. 86.7mm + 1.524 = 88.224mm. This bore gives 2.58L displacement with a 70.4mm crank.

Plavan

12-29-2005 09:07 AM

Thanks!
LOL. Simple enough. I thought it was more involved than that. :)

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