John,
I had a similar experience several years ago while attending a Seminar
by Champion Spark Plug. They had an engine on the dyno equipped with
spark plugs which indicated cylinder temperature. A little advance from
the original setting gained a little hp, a couple of more degrees
advance gained a little more hp and a climb in cylinder temp. A couple
more degrees gained no hp and the temp went even higher. The next couple
of degrees dropped power and the temp went through the ceiling. I have
always remembered that session.
Tom, Redding CA - #216 D/CC
John Burk wrote:
> Mother Nature enjoys practical jokes doesn't she - I well remember from
> tuning my AFD you don't always cure detonation by fattening it up - The only
> thing I remember from 4 years in high school is a seeing movie made by
> General Motors in the 40s using high speed photography and an engine with a
> glass cylinder head to learn about preignition - This lead to the wedge
> combustion chamber Olds and Cad engines in 1949 - Wouldn't we all like a
> movie inside our engine to see why 42 deg advance works better than 30 deg .
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