Re: 13-1/2 to 1 compression ...on the street?

On Apr 30, 4:24=A0pm, "Steve W." <csr684...@[EMAIL PROTECTED]
> wrote:
> John Kunkel wrote:
> > "wstiefer" <wstie...@[EMAIL PROTECTED]
> wrote in message
> >news:Nl0Sj.12289$2g1.2583@[EMAIL PROTECTED]
> > Alcohol
>
> > My thought, too. If the CR is actually that high I can't see it ever
run=
ning
> > on pump gas regardless of the heads, cam, etc.
>
> Why not? NASCAR runs 12.5:1 on 98 octane using iron heads. They ran 13:1
> on the old 105 octane leaded fuel. I have run 13:1 on pump gas with
> aluminum heads on a 427 with a set of Rhodes lifters to drop the cam
> down some. No problems at all.
>
> --
> Steve W.

I would think the Rhodes lifters would actually hurt, not help -
they'll improve idle quality but at the cost of increased low RPM
cylinder pressures.  or am I thinkin' wrong?

I will say that at anything over 10.x:1 you probably need to have
someone GOOD (not me!) tune the engine to avoid an inadvertent
detonation incident.

nate

(currently running 10.25:1 with iron heads - stock 63-64 spec
Studebaker R1 engine...)