does the SAE measure the displacement of the rotary engine properly?

Question

currently the SAE measures the displacement of a rotary engine based on one of it's 3 working chambers per rotor.

Answer 1

Note that in a rotary engine the Otto cycle is completed on a single rotation of the rotor. The volume of one rotor chamber during one cycle event times the number of rotors is the same as measuring the volume of a piston engine by the volume of one cylinder times the number of cylinders.

Answer 2

Once you hear the sound a rotary engine makes--particularly the Renesis--you'll never want to drive a car with a piston engine again. Consider this: Mazda's rotary engines rev all the way to 8200 usable rpm. It's an amazing thing to behold. Now, the RX-8 is a poor replacement for an RX-7, but that's another story. The thing about the rotary engine is that it needs constant tlc. You need to check the oil level every time you fill the tank with gas, because the rotary system consumes oil. Rotary engines are more susceptible to seizing up, too, but they are easier to fix if that happens. The bottom line is that if you constantly--and I mean RELIGIOUSLY--monitor the oil usage, the rotary engine is just as reliable as a piston engine.

Answer 3

Based on the largest volume of air at a particular rotor position times the number of rotors. Not really different from a standard reciprocating engine when you think about it.