Posted by buickanddeere on January 28, 2018 at 07:35:25 from (173.241.109.36):
In Reply to: Combustion Talk posted by David G on January 27, 2018 at 10:14:58:
Detonation is the desired flame front from the spark plug colliding with another flame front that is not supposed to be there.
The secondary flame from could be from glowing carbon or pre-ignition.
Pre-ignition is the air/fuel mixture igniting prior to the ignition system providing a spark. Caused by lean mixtures, high heat in the cooling system or ambient air,glowing carbon, lube oil in the crankcase from worn rings or a faulty PVC system, low octane fuel or lugging the engine.
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