Posted by David G on October 27, 2018 at 18:51:21 from (209.181.208.169):
There seems to be some misinformation going around again.
Detonation is caused by explosions along the boundary between rich and lean areas, caused by improper mixing, or over fueling. You cannot have detonation on a lean homogeneous mixture. We see this in the big turbo charged natural gas engines when they are lugged too much, or the turbo is not producing enough boost on the two cycles. A good way to think of this is when you lug an engine down too much starting out and it knocks before picking up, this is caused by over fueling trying to produce the torque, called spark knock by my dad.
Pre-ignition is caused by flakes of carbon that ignite a mixture, by timing that is too advanced for the speed of the flame front, or by a mixture that is above the autoignition temperature. This ignition pushes back on the piston before it has a chance to get the correct angle on the crankshaft to utilize the push. Retarding the timing will help if there are fuel related issues. We re now seeing this issue on the natural gas engines because they are getting more ethane out of the shale gas and it has a lower autoignition temperature.
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