Quote:
Originally Posted by BillGrissom
more leakage past the rings at 20:1 compression.
|
It's my understanding that the higher compression ratio actually promotes BETTER sealing compared to a gasoline engine. The piston rings are spring loaded in a sense, so they push out against the cylinder wall even at rest. During combustion though, the high pressure gets behind and above the piston ring, and pushes it down and out against the cylinder wall. Since the diesel has a higher CR and MUCH higher combustion chamber pressure, it seals VERY well. There will be blow by in any worn out engine, but it's certainly not because of the high CR.