"pittss1c" wrote in message
...
wrote:
On Apr 19, 4:10 pm, pittss1c wrote:


If you get detonation in an O-320, that engine won't last long at
all. You'll either burn holes in the pistons or blow the heads off the
cylinders. Cylinder bases have also been noted to pull right off the
case.

Dan

I think people still use 100LL even with 12:1... I am going to be
surprised it 10:1 is an issue.


It's not all down to compression ratio. Modern cars and motorcycles are
managing compressions over 12:1 with regular gas and very lean mixtures. The
design of the combusion chamber has a great deal to do with detonation. Get
some time with a design team and a computer model of your flame front and
you'll be fine.