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Originally Posted by DNieves
The efficiency is in the fact that rotaries produce a lot of power (not low end) have less moving parts in it and they're small too.
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its efficient due to its minimal parts and its rebuilds arent costly at all, but not making enough power downlow is what hurts the rotary in the gas mileage department. In fact, any stock rotary engine dyno, rather it be twin turbo or N/A, shows a not so linear TQ line. You really got to wind it up on the dyno and eventually you'll see its power show. Thats what kills there gas mileage. Nothing efficient about that. Its not an efficient engine IMO, but I love there concept. I love the popping sound, and i love what they sound like at 12k rpm sitting in an old RWD corolla. But lets face it, that engine isnt practicle<SP?> nor efficient. To me an efficient engine is an engine that can make awesome power <stock> and return excellent gas mileage, like the SI for instance.