Leyland Car Owners -

Date: Wed, 12 May 2004

: I guess I'm at a bit of a loss concerning the discussion of detonation and pre-ignition.
: The two engines with which I have experience are the Buick and Oldsmobile versions of the 215 V8 and neither has been sensitive to the above conditions.
: The Buick version was build with only 8.5 to 1 compression so I wouldn't expect much problem.
: The Oldsmobile version, using 41cc (small) combustion chamber heads -- along with Arias Arias Pistons, give about 13.5 to 1 and detonation/pre-ignition wasn't a problem.
: IT IS MY UNDERSTANDING that the Olds head is more forgiving in this regard but that it doesn't flow quite as well as
: the Buick head.

: The highest octane available in my area (higher altitude of 4,000 feet) is 91 on the R+M/2 scale.
: Initial timing was set at 10 degrees initial and only needed to be pulled back to 4 or 5 degrees initial when at sea level -- even with coastal octane of 92/93 octane.

: Are others having problem with detonation? I never have.

: Darius
: GRAYTESLA@AOL.COM

Technical problem