Ummm....thats mostly true. Except for the part about compression ratios. Rotaries tend to be a little lower, but they are still pretty much on par with a piston engine. The 13b (not the one out of the twin turbo last gen ones) has a CR of 9.7 on the N/A ones, and 9.0 on the TurboII. The third gen 93-95 engines had a CR of 9.0 :1 as well. The first gen 12A motor had a 9.4 : 1 compression ratio.
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Without turbos, the old generation rotary would be inefficent and not a good performer
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I beg to differ. The N/A motors weren't as efficient in terms of Power/Gas as the turbo motors, but they were by no means "inefficient". And certainly not bad performers. 160HP isn't great, but how many cars back then had an NA motor capable of producing that much power out of that small of a motor? Prety much nobody that i know of.
Oh, and BTW, the RX-7 certainly didn't require turbos ("because it holds its compression ratio better and doesn't require turbos "). It had plenty of zip without them.