![]() ![]() Of course you have to be sure your gear can take the loads imposed at the lower speed (oil pump capacity and hydraulic pressure on the discs) and that the shaft can take the increased torque. If you want to cruise for long periods at low RPM, prop up so that the engine is normally loaded and you will avoid all of this trouble. The additive package in the oil will give out much sooner and allow the acids to start working on the rod, main and cam bearings.Īt least on a normally aspirated engine, it is not the RPM that matters, but the load. Increased blow-by of the nasties above from low load operation adds significantly to the normal rate of oil contamination. ![]() The sulfur in the fuel forms (after a couple of chemical reactions) sulphuric acid. The carbon in the fuel burns to form CO2 (and CO if combustion is incomplete). If the engine is not brought to normal operating temperature (oil temperature) for a sufficiently long period there is not enough heat to evaporate moisture in the oil that comes from the blow-by gasses. At some point the a ring breaks and wrecks the cylinder. Eventually blow-by deposits form behind the rings and they become stuck. This causes glazing of the cylinder walls and increased blow-by of combustion gasses past the rings into the crankcase. It is my understanding that low load operation, at least in DDs, does not generate sufficient combustion chamber pressure to force the rings into the cylinder walls with sufficient force. ![]()
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