Miata List Archive

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Mail From: mywong23 (mike wong)

Hi Keith,

what causes the effective advance?
the plug is closer to the center of the chamber - so it ignites a bit sooner?

what do you think the effect equates to?
like .5 degree or more?

just curious,
thanks,

mike wong
94 chaste


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Mail From: pete (Pete Naylor)


mike wong wrote...

> what causes the effective advance?
> the plug is closer to the center of the chamber - so it ignites a bit sooner?

It ignites at the same time. The expanding flame front from the point of
ignition reaches the top of the piston sooner and that surface serves to
speed the rate of reaction. I suppose that there's more material in the
cylinder, too, which increases the compression ratio (that speeds the rate
of reaction too).