Quote:
Originally Posted by bruce.augenstein@comcast.
Absolutely agree on knock doing damage, but I'm actually asking how lugging does damage. My opinion is that a normal M3 is mildly lugging at 1500 rpm, but don't see how that can cause damage.
Bruce
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It will react differently in different gears. It certainly won't be lugging in 1, 2, or 3.
By the way, detonation (not pre-detonation) and pre-ignition are two completely different damage mechanisms. What is being experienced at low load is likely detonation, or the spontaneous combustion of the mixture ahead of the flame front.
Pre-ignition is the combustion of the mixture before the spark plug fires by a hot object in the cylinder. It is far more damaging than detonation.