Kendall,
I have 9.5:1 compression on my car with no problems on 93 octane.
Goodparts runs 9.7. If you're doing EFI (and presumably you'll be able
to program fuel and ignitin curves into your ECU), you could safely go
over that, I would think. At the very least, you'll be safe with 9.7:1
on 93 octane. Getting your combustion chambers worked a bit to smooth
them out and get rid of any potential "hot spots" will further help
avoid detonation.
Tim Holbrook
1971 TR6
--- Kendall Larsen <klarsen@inreach.com> wrote:
> Dick, Berry, Dale, Bernard, Tim, and Hershel,
> Thanks for the advice, thankfully all it took to get the head off
> was
> removing the studs. A little wiggle after that and it came off quite
> easily.
> Thankfully your more creative and forceful methods weren't necessary
> : )
>
> Oh and by the way Dick, I've got the head off because I was
> changing the
> exhaust flange gasket and couldn't get the pipes off the manifold. So
> I
> decided I need a new exhaust system anyway as mine is rusted in
> parts. This
> decision led me to just cut the exhaust system out and remove the
> intake and
> exhuast manifolds to remove the exhaust pipes. Now with my manifolds
> off. I
> think to my self. Hey now is as good as time as any to check the
> number 3
> intake valve because I suspect it may be sticking. So then as I'm
> taking my
> head off the next thought is hmmmm... maybe as long as the head is
> off I
> should mill it down and raise my compression. It is at the pathetic
> stock
> ratio of 7.5-1. ('74) So, that twisted train of thought is why I was
> taking
> my head off after 6000 miles. (Besides my car was going off the road
> for EFI
> conversion anyway) Are you sorry you asked now?!
>
> As I understand it, there are no negative side effects to
> boosting the
> compression as long it is kept in the reasonable range of 8.5-9 to 1
> ratio.
> Am I correct in this assumption?
>
> Kendall
> 74 1/2
>
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