Re: Low compression engines

[Dave Krugler <dkrugler@xxxxxxx>]

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Detonation is an explosion usually caused by pre-ignition of the fuel/air 
mixture by the heat of compression before the plug touches it off due the 
fact the flash point of the fuel is too low to prevent ignition before the 
plug touches it off.  The fuel air mixture is consumed much faster than the 
controlled burn initiated by a spark plug ignition because it all ignites at 
once.  It's signature noise comes from the effect of this violent 
explosion's very sudden rise in cylinder pressure hitting the piston which 
is often still on it's way up to top dead center.  The rise in pressure is 
like hitting the piston with a sledgehammer blow.  It can collapse the 
piston or hole it and beats the H out of the rod and main bearings.  A well 
timed spark ignition with high enough octane to allow smooth flame 
propagation produces a much more gentle rise in cylinder pressure that 
pushes the piston down the bore rather that striking the piston with a 
sledgehammer blow.


> From: Robert neal zimmerman <northwestweirdo@xxxxxxxxxxx>
> Reply-To: 1962to1965mopars@xxxxxxxxxx
> To: 1962to1965mopars@xxxxxxxxxx
> Subject: Re: Low compression engines
> Date: Wed, 19 May 2004 20:53:47 -0700
>
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>   Geez and I always thought cars were for boneheads, drinking was a much
>   easier hobby!
>
>     I got more questions if somebody would be kind enough to answer.
>        A) Is detonation the same as pinging??
>        B)  How do u know if you are getting detonation? OR LET ME PUT IT
>        ANOTHER WAY:
>              Can detonation occur that u cant hear?
>         C) What exactly will detonation do to an engine?
>     Neal Zimmerman, Eugene Oregon
>
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Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html. 


b7yoMz.