wats detonation?

detonation (and preignition) sounds like marbles inside a jar, rattling around.

it can be from the mixture lighting off on its own or from leanness, too much timing, heat, C.R. being too high, low octane fuel, carbon build up in the chambers, etc.

prevention: to treat the symptom, you can back timing off or run more octane. those are the most common. keep the chambers clean.

for a little more info, try readin some of this:
http://forums.stangnet.com/search.php?searchid=424697
Jrichker has a nice little write up - you should find that post in one of those threads...
good luck
 
this is it
 

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