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Sorry I was talking about large diesels. A smaller engine with less rotating mass can rev higher but due to its smaller displacement doesn't produce the as near the torque of larger diesels. I wouldn't like to see a 8.3 Big Cam Cummins spinning over 4K while pulling 80,000lbs. Though I am a...

The answer is very simple. Diesels are a lot more rotating mass and really have no need to be high RPM motors. Almost all diesels redline under 3000RPM. Its not really a limiting factor when you take into account that final gear ratios is what gives you your top speed. I think your putting...