Re: [Amc-list] detonation

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

Keith,
Just a thought here, are you absolutely sure there was no detonation when
the engine was on the dyno.
Was it just too loud in the dyno room to hear the detonation?
Did the dyno operator lug the engine at all? If not the detonation would not
occur.
My 304 would routinely detonate when going up a steep hill in high gear. I
usually wrote it off to a bad load of fuel and pedaled the throttle
accordingly.
Was the dyno fuel the best available and now you got a crap load of bum fuel
that even 6 gals. 100LL won't cure??
Now for the really serious thoughts, is it possible a sharp edge was left
exposed to the combustion chamber that has come to
life now the engine is in a car and driven? Has it acquired a chunk of
carbon already that won't go away?
Does the advance really come in at the rpm stated? Is your timing equipment
calibrated correctly?
Armand


----- Original Message ----- 
From: "Tom Jennings" <tomj@xxxxxxx>
To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
Sent: Tuesday, June 24, 2008 12:05 PM
Subject: Re: [Amc-list] detonation


> 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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