Re: [DMCForum] spark advance/retard
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Re: [DMCForum] spark advance/retard



Jeez checksix, 

throw us a bone here or something.  It's such a simple argument, but
regardless of the # of URLs supporting Martin, Bill maintains that
"advanced" is closer to TDC than "retarded" (assuming we're BTDC).  

FWIW, It may have been (unknowingly) something that Bill had previously
posted that made me initially agree with him about which was which.

We all agree that advanced timing can cause detonation.
I think that, from the layman's view, it makes sense that the later the
plug sparks in the cycle would increase the probability of detonation
through a 'dieseling' effect.

>From everything that everyone says (except Bill), when the spark plug
sparks earlier, the chances of detonation increases.  Why the hell is
this?  "Knocking" can be caused by the flame propgating too quickly in an
advanced engine-- but what causes preignition, an uncontrolled explosion
in the cylinder?  Does this happen before the advanced spark due to
elevated head in the cylinder or after the advanced spark due to ignition
delay or misfire?  

These are all questions that I haven't found answers to yet...

Jim


On Wed, 22 Oct 2003 02:00:48 -0000 "checksix3" <jetjock11@xxxxxxxx>
writes:
> Amazing...absolutely amazing. It's indeed inspriring. Why would 
> anyone look elsewhere when there is the clarity and depth of 
> knowledge regarding basic internal combustion principles as 
> demonstarted by those few special people here.
> 
> 
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