is 11.2:1 compression too much for 91 Octane

IQ52 said
That's mad scientist. All other things the same, decreasing the LSA closes the intake sooner and increases the cranking compression. It's thought that increased overlap "bleeds" (I hate that word) cylinder pressure. Not true. Because increased overlap is generally associated with longer duration, the longer intake duration closes the intake later and that is what decreases cylinder pressure.

Keeping the same duration and decreasing the overlap opens the intake valve sooner. If it opens sooner and stays the same duration, it must close sooner increasing the dynamic compression.

From Comp Cams,

http://www.compcams.com/Technical/FAQ/LSAproperties.asp

Ok, keep on keeping on then fools. I have spent the last 20 years taking out the junk 268 comp on 110 LSA and using ANYTHING close with less LSA and they are easier to tune, have LESS cranking pressure.

Do some study and see what big HP engines are now using for LSA's (hint hint I've used them as tight as 98 and I know for FACT some have gone to 95).

And most of the people I know STILL use comp junk but the order the SAME lobe without the comp junk catalog standard 110 LSA.

And yes, I hate comp.