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Piston Domes
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| What happened: |
During the second session of the dynamometer test (engines operating at 100% load), noticeable blow-by was noticed from the value cover breather cap on the passenger side. |
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| Why did it happen: |
After inspection of the disassembled engines, we noticed that there was evidence of blow-by on the engine B piston domes, however, it did not appear that the piston rings were worn to the point that unburned fuel was getting past the rings. We feel that the wear was caused by the motor oil in engine B losing its viscosity. |
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| Why is this important: |
For optimum performance, an motor oil's viscosity must match the application. Viscosity affects a motor oil's ability to reduce friction and wear. |
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| Vehicle application: |
Thinning of a motor oil is more common in extreme conditions, such as auto racing, towing or any other application that would generate high RPM's or be put under significant load. |
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