Posted by David G on December 06, 2017 at 19:05:43 from (97.127.179.132):
We have been working on the 4000 HP natural gas engine for a few months, starting to learn some things.
The engine has been tripping on detonation and shutting down when load changes. The governor is adding fuel, but the turbo is working to catch up thus causing rich mixtures. It seems like some of the cylinders are misfiring, which causes the governor to open up more, the remaining cylinders ignite with the rich mixture and detonate. I used to think of this as spark knock when I lugged an engine down too slow and worked it hard.
Detonation is different than pre-ignition and most people think they are the same thing. Detonation is caused by a mixture that is too rich under load. The fuel tends to form pockets and the boundary layers between lean and rich ignite and cause explosions. This is a lot like cavitation in a hydraulic pump. The pistons on this engine are 16" in diameter, so it is a loud noise. Timing has NO effect on detonation, the issue from timing advance is pre-ignition.
The engine is always on the ragged edge of running, even a rich mixture is still pretty lean with AFR 38:1 rich and 40:1 lean.
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