Isn an aircraft powerplant derived from an automobile engine going to be heavier than a conventional aircraft engine?
Answer Most conventional engines such as the Continentals or Lycomings were actually designed many decades ago. They are BIG engines. A Continental 0-200 producing 100 hp has displacement of 200 cubic inches (3.3 litres). This means big pistons moving down big cylinders fed by big valves. Big pistons needs a big crankshaft. Modern engines develop their power at higher engine speeds necessitating a reduction system. However, even with this trade off, wet and ready to run, the CAMTM 100 weighs a about the same as a Continental 0-200. It is only 75 lbs (34 kg) more than a wet and ready to run Rotax 912 but offers an extra 20 horsepower.
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