The thick oil is cooler because more heat is staying in the engine. Thinner oil gets hotter because it flows more volume, and does a better job of taking heat out of the engine.
Viscosity vs. Temp
- Thread starter sidney004
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In this particular case, reduction in friction has nothing to do with his oil temps. His problem is blow-by due to ring flutter. For example, the Sequence IIIF test used a ring gapping strategy to increase blow-by and thus increase the stress put on the test oil. Some of you guys focus on viscosity with out any comprehension on what processess are taking place in these engines.quote:
Originally posted by Clyde65:
Some of the guys here will tell you that you that can't have a reduction in friction and an increase fuel mileage with a thicker oil - I respectfully disagree.
Bingo!
What is the difference in kinematic viscosity at 140C? If the lower oil temp is not a result of reduced friction and the engine is producing the same power levels with either viscosity; then it may not be rejecting the heat in the engine oil. I did not take any data on coolant temp nor any instrumented HP readings.
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