[DMCForum] Re: still advance/retarded discussion
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[DMCForum] Re: still advance/retarded discussion



I think Martin and I are at different ends of combustion window. He's
at a point where spark is causing problem. I'm at a point where
cylinder/fuel is causing problem.

Probably used terms "pre-ignition" and "pre-detonation" incorrectly.

My mixture was exploding on its own before spark ever hit it.

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx>
wrote:
> Bill, you're right,  you never said that.  I misunderstood what you
said.
>  I apologize... It seemed to me at the time that it made more sense that
> you mixed up advanced/retarded instead of arguing that retarding
> increases knock.  A knock sensor by definition retards timing when
> activated.
> 
> It's easy to get confused when even you are contradicting yourself. 
> First you say, 
> 
> >Back to 10, then start predetonating. Up to 13 and lose power.
> 
> and then
> 
> >Here's a little jewel from my new Volvo documentation been reading all
> >night (B28F Manual, Section 2, Group 26, Page 21): "When the ignition
> >advances the engine efficiency increases and the combustion
> >temperature decreases."
> 
> So does advancing increase power or lose power?  Are you saying the
> swedes are wrong? Or that increasing efficiency loses power?
> 
> >Predetonation is an uncontrolled explosion. Why do you think spark
> >gaps are specified? To control flame propogation.
> 
> I think spark gaps are specified to get the correct voltage/duration of
> spark that is needed for the engine to not misfire given the setup
of the
> engine and ignition system.  Spark plugs don't control flame
propagation,
> they start it.
> 
> >Is better to shoot spark sooner than to let mixture combust on its
> >own. What in the world do you think those advance mechanisms are doing
> >on distributor anyway?
> 
> They're not "anti-detonation control mechanisms"!!  They're for
power and
> flame propagation timing.
> 
> >If you really feel this way I suggest you disable spark advance on
> >your distributor immediately (don't forget those pesky
> counterweights)...
> 
> If I feel that to far advancing timing causes knock?
> 
> Jim
> 
> 
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