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  1. dieselsmoke

    Question on Deep Sump Cooling

    No elaborate data is necessary to answer your query. Will the added sump capacity that you identify cool the oil 20 degrees, and, additionally, cool the cylinder heads. The answer is no. The oil will run cooler, to an insignificant degree, because the fifty percent increase in oil volume will...
  2. dieselsmoke

    maximum piston speed?

    The book, "Classic Racing Engines," by Karl Ludvigsen has a chart on page 214-215 that shows piston speeds for fifty classic racing engines. The highest piston speed listed is 5,964 feet per minute for the 1992 Honda V12. It had an 88mm bore, a 47.9mm stroke, and ran at 14,000 RPM...
  3. dieselsmoke

    how much crankshaft twist?

    When Chevrolet brought out its new LS1 aluminum small-block engine, the company claimed less crankshaft stress due to a revised firing order, compared to the outgoing cast-iron small-block engine. Can anyone comment on the reasons why the revised firing order reduced crankshaft stress?
  4. dieselsmoke

    V-Twin and V-4 motors

    Alex Dring asks "how are the motorcycle engines getting away with such balance issues?" Motorcycle designers use a variety of approaches. 1)Rely on rider tolerance. Old Harley Davidsons had high engine vibration (the feel of power). 2) Smother it. When vibration became an issue...

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