[1967Tempest]

Originally Posted by BruceWilkie

BTW Here is an excellent link on detonation vs preignition. http://contactmagazine.com/Issue54/EngineBasics.html.

X2!!

I liked this quote...from the article.. Probably the best thing to take from the read..

"For emphasis, the design compression ratio is adjusted to maximize efficiency/power on the available fuel. Many times in the aftermarket the opposite occurs. A compression ratio is "picked" and the end user tries to find good enough fuel and/or retards the spark to live with the situation...or suffers engine damage due to detonation."