Quote:
Originally Posted by Suberman
High compression engines run slightly cooler. That's where the extra power comes from, more thermally efficient.
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Sorry Suberman, but I am going to have to call BS again.
Raising static compression ratios DEFINITELY increases engine head temperatures. I race air cooled boxer engines (Type-IV) and the number 1 reason to be careful in increasing CR above 10:1 is increased chance of engine failure due to increased head temperatures. That is why I need to run Cylinder head & Exhaust temperature sensors on the racecar.
Increased head temps results in knock which is obviously one of the most critical concerns on this engine.
Now with the VVT system on this car, the dynamic CR can vary based on tune, so it is not apples to apples, but last time I checked PV-nRT still applies (higher pressure equals higher temperature)