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Re: rotary
The typical Mazda wankel has a displacement of .65 litres per rotor. The 1.3 litre is a two rotor, each with .65 litres displacement. The 2.6 four rotors have from what I know only been used in racing, like the R26B.
Don't know why people tend to believe that wankels use high engine speeds, because they don't use that high speeds. The R26B didn't use engine speeds higher than around 9000 rpm, which was actually less than some piston engines used in the same class.
The reason why wankels have higher power/displacement figures than most 4-stroke piston engines is because they produce 1 powerstroke per revolution on the axle per rotor similar to a two stroke piston engine while the 4-stroke piston engine does only produce on powerstroke every second revolution.
In F1 only 4 stroke V10 piston engines with amaximum displacement of 3 litres are allowed (90 degree V8 engines with a maximum 2.4 litres displacement from next year). These engines do however offer more than 900 hp from 3 litres displacement with a weight of only 90 kg. The R26B gave 270 hp per litre of displacement (700 hp in total) but with a weight of 180 kg.
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