Rotaries get low torque as it is, hence the usage of a supercharger for the Miller Cycle. If I had a RX-8 I'd yank that Rotary out and put a Duratec in it. With lower gearing the thing would actually get good fuel economy. The Rotary is more for redline racing. The weight of the Renesis is something like 240/270lbs, the 2.3l Duratec in the Ranger, B-Series, and Focus is 200lbs now. The older 2.3l Limas were 240lbs. Rotaries can put out 800-900hp in race trims. In comparison the 2.3l get 400-500hp. The Rotaries are great for racing given their power:weight advantage, and their design is simple, light, and freakishly reliable. The MPGs are terrible but they're competing with V8s not 4 bangers.
Honestly, Mazda should use them in the Miata too. It's a waste of money to have a special RWD Engine for both of their niche platform when they could just standardize the Rotary and use it in both of their Sports cars.
...At least we're talking about something interesting now.
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-Allch Chcar
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