[Diy_efi] Timing Advance Curve?

[Mike]

At 09:29 PM 12/20/02 EST, you wrote:
>or if youd like the simple sum of it all 
>
>  detonation is a pressure wave that meets an oncoming flame front.and
cuases 
>an instintainous rise in combustion pressures. but these are small focused 
>expolsions. 

You mean after its ignited of course ?

Otherwise its just a reflection of the pressure wave from the initial
flame front arising from the spark ignition,

So to really clarify what is going on when there is detonation:-

-	Piston moving up bore
-	Spark, starts initial flame front from that source
-	Piston rising, pressure & temp going up everywhere
-	At some other point there is ignition and not from
	a carbon deposit, so its not 'preignition' per se but
	a defined 'detonation' ie It 'detonates'.
-	The second (or more) flame front from this other ignition
	point arising out of compression meets the first flame
	front and that is the 'bad thing' we've been talking about ;)

rgds

mike


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