Low compression pressure in diesel engines

jeromero · Feb 13, 2004

In 3200HP diesel engine we have a particular thermodynamic behavior in a particular cylinder, monitored buy a pressure sensor that relates pressure with crankshaft position and comparing with other cylinders: there are low compression pressure, low peak pressure and a big delay in peak angle. If there are no leaks in the combustion chamber (by rings or valves), what would be the cause of a low compression pressure. We think that maybe there is a difference in volume between chambers (short connnecting rod, etc).

Thanks,

bashy · Feb 18, 2004

What sort of Injectors are on the engine? The Hydraulically actuated and electronically controlled injector types are the most sensitive and thus if one of the twelve( i assume a 12 Cylinder Engine)is not firing at optimal capacity, it can lead to loss of compression in the particular chamber.

dwedel · Mar 11, 2004

In a spark ignited engine, the low/late peak would probably be attributed to late firing. I assume this would be true with diesels except it would be injectors instead of spart plugs.

What does low compression do to a diesel? Slower ignition? Maybe a cracked liner? perhaps I am a bit late to reply to this thread.

jeromero · Mar 13, 2004

Thank you for your answers guys. You canf find complete information in another forum submitted in Engine & fuel engineering section.

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Low compression pressure in diesel engines

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