According to Consumers Report, the Mazda RX-7 rotary engine in its final form before it was discontinued was the most reliable engine ever put in a car. One tenth of one percent of all owners reported engine trouble of any kind, including running out of gas, and the average milage reported when the trouble occurred was 168,000 miles. The president of Mazda loved rotaries and demanded that the troubles be fixed. Early rotaries were plagued by seal failures, phasing gear breakage, and water leakage between the sections. All these troubles were fixed. In retrospect, the biggest cause of seal failures and scored housings was fuel system problems that leaned out the engine. The engine generated high emissions due to the inherent poor combustion chamber shape but could develope 500H.P, plus from 1300cc's. Puerto Rico is the hotbed of RX-7 developement and street legal cars that do the quarter mile in 8sec. have been reported. Technical expertise on Mazda turbo rotaries is limited in the western United States, I found only two businesses that could answer my questions when I had my '87 RX-7 turbo, one in Long Beach, California, and the other in Texas. I know of two brands of rotary motorcycles. Norton built many for the police in England and I think NSU built a small one in Germany. Evinrude built a rotary snow machine. Garrett AirResearch did some experimental work on turbocharged Mazda rotaries and was astounded at the power and durability. They built a streetable RX-7 that they drove at 230MPH on the salt flats in Utah and then drove it to New Jersey and ran the quarter mile in the low 11's in 1988. It was the only car at Bonneville that was driven there from home, back and forth to the motel every night, and that ran over 200MPH. I know a fellow that used to race rotary sports cars. He said he lost all the water out of one during a race aand it continued to run fine and lead with just cooling from the oversized oil-cooler. He finally had to quit, however, when the smoke inside the car got so bad he couldn't see where he was going.