In a message dated 14/5/1999 9:19:44PM, JZIMMERM@exch.co.albemarle.va.us
writes:
<< Another question that I have is the effect of spark plug heat ranges upon
combustion. Exactly how do heat ranges affect the combustion process?
Assuming that I were running a mixture slightly richer than stochiometric,
what effect would a colder or hotter plug have on the combustion? TIA
>>
Hi Jackson,
Interesting point. I think it is more a case of too hot a plug causing
premature combustion or simply damaging the plug and or the piston crown
(obviously the plug grade has to be some way out). A colder plug simply
fouls in slow driving because it fails to burn off deposits.
I think that as least as far as the A series engine goes plug type doesn't
make much difference (ie plug electrode type) to power. I would assume that
the amount of spark energy makes more difference that the plug itself.
Finally, what I have written above is only my best guess opinion based on
limited experience. I haven't ever found much technical writing on plugs
(advanced stuff that is).
Daniel1312
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