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This paper will show a unique type of combustion on two types of natural gas engines. Case Study One is a Cooper Bessemer 8W330 that had severe detonation on startup. Over a 20-year period, this unit has had severe detonation until the engine water and oil temperatures got high enough for the by-pass to close and load the engine. Running at full load and speed, the detonation went away. This unit has broken over $2 million in pistons, cylinders and heads in the past 20 years due to the detonation. After three turbochargers, new air/fuel ratio controls and a lot of programming, the problem would not go away. Memorial Day 2004 the engine would not start and the equipment analyst was called. Checking the firing pressures on the power cylinders as the engine started, it was noticed that the loud noise from the power cylinders was not detonation. Case Study Two is from a Dresser-Rand TLA-6 with aftermarket pre-chambers which were installed in the mid 1990s. After several other changes and controls were added, the unit had severe detonation on startup. Normal thinking to reduce detonation is to retard the ignition timing to build heat in the turbocharger to make more air. This did not work. After checking the firing pressures on startup, it was discovered we were treating for detonation and the problem was pre-detonation. The presentation explains the differences of these types of combustion, detonation, pre-ignition and the very rare pre-detonation.
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