I ran 13.2 for several years with just 100 pump octane gas. Just be sure to
watch the plugs for detonation. the pistons were factory stock GT-6 which gave
a .040" oversize on the Spitfire.
Never be beaten by equipment
> From: trmarty@hotmail.com
> To: fot@autox.team.net
> Date: Wed, 20 Jul 2011 11:14:11 -0400
> Subject: [Fot] CR
>
> What is the collective wisdom of the FOT masses as to how high of a CR can
be
> run on cast pistons? This would be Spitfire FWIW. I am at 10.8:1,
> intentionally kept it low because of the cast pistons. I have had a
> discussion with an engine builder telling me I can go much higher. I am
> contemplating bumping up to 12:1. Before I blow something up I thought I
> would toss it out for discussion. What say ye?
>
> Thanks,
> Marty (one race in and I already want to go faster) :)
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