Re: [Amc-list] detonation

[Tom Jennings <tomj@xxxxxxx>]

Keith Evenson wrote:
 > Yesterday I went to the local airport and put
> in 6 gal of 100 octane with the rest of the tank filled with 92. I am  
> still getting the noise but it is not as bad. So should I go to a  
> 50/50 mix or try lowering the timing more or is there something else  
> anyone can suggest? I have run it with the vacuum advance  
> disconnected and still getting it.

Hmm, though it will kill performance, and extreme enough will overheat 
it, but if you back off timing sufficiently the pinging will stop -- 
that will tell you if it's a real detonation ping you are chasing, or 
some other noise. Lose 50, 75 hp for an hour while you diagnose.

If you don't have a minimum amount of advance a lot of hot gases will go 
out the exhaust and really heat the head.

With the vacuum disconnected, say 5 - 10 degrees static advance and 15 - 
20 mechanical, it ought not ping if the compression ratio isn't 
astronomical.
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