Which engine parameters tell us that engine is overloaded?

04 Apr '18, 06:52

April 4, 2018, 6:52 a.m.
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The exhaust temperature and combustion pressure of individual cylinders are proportional to the load of the engine. Higher the load, higher the exhaust temperature and combustion pressure of each cylinder.
However, exhaust temperature depends on the inlet/scavenging air temperature as well. If ambient air temperature is high or/and scavenging air cooler/intercooler performance decreased the exhaust gas temperature will increase without increasing of combustion pressure.
Turbocharger RPM (if installed) is also one of parameters to judge engine overload: higher the RPM - higher the load.

Hence general rule is:
1. Check Exhaust gas temperatures and Combustion pressure (Pmax) of individual cylinders. If both parameters abnormally high then the engine is overloaded.
2. If Combustion pressure (Pmax) could not be measured and Exhaust gas temperatures found abnormally high, check scavenging / engine inlet air temperature. If air temperature is not increased or still in normal working range then most probably the engine is overloaded.
3. High Turbo RPM is additional sign of overloaded engine.

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04 Apr '18, 07:14

April 4, 2018, 7:14 a.m.
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