View Single Post
      09-27-2011, 09:39 AM   #48
apecush
Lieutenant
6
Rep
457
Posts

Drives: 2008 E90 M3
Join Date: Aug 2011
Location: Edmonton

iTrader: (2)

Quote:
Originally Posted by bruce.augenstein@comcast. View Post
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
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.