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Since the Mazda RX-8 was cut off in 2012, the automotive world has not seen the rotary engine put into production. However, the Clayton CR700W is bringing it back in an amazing way with a machine called the "ultimate track bike".

In fact, the engine claims to have one of the highest specific power outputs of any naturally aspirated engine in the world. The twin-rotor mill has a displacement of only 690cc, but can produce 220 horsepower at 10,500 rpm (105 lb-ft at 9,500 rpm), which is equivalent to 319 horsepower per liter. The company said that by contrast, most MotoGP cars have about 300 horsepower.

The rotary engine has many advantages. On the one hand, it is very compact and requires fewer parts than traditional piston motors, while the one in Crighton consists of only three moving parts. Due to its simplicity, the entire assembly weighs only 53 pounds. Even with a six-speed gearbox, the device weighs only 95 pounds.

Combined with a Spondon-derived chassis made of 7000 series aluminum alloy and Dymag carbon fiber wheels, the entire CR700W weighs only 285 pounds. Even Ducati Superleggera V4 weighs 336 pounds, and Clayton's power per pound exceeds even the supercharged Kawasaki H2R.

Unlike the reciprocating piston engine, because the rotary engine only rotates in one direction, it has less vibration and likes to accelerate at high speeds, so it is very suitable for racing applications. As it happens, this is also an extraordinary exhaust note. Crighton guarantees smoothness and sound.

Brian Crighton is no stranger to rotating two-wheelers. This former three-time British 50cc champion is not only a victorious driver, but also an engineer. He developed Norton's rotary engine road bikes in the early 1980s into race-winning machines, which frightened the British Superbike Championship in 1988-94. Crighton's bicycles won three top prizes in the 750cc category in 1989 and the superbike category in 1990 and 1994.

Stickers start at £85,000 (US$116,130), and buyers can customize their bikes by choosing Ohlins or Bitubo suspensions and whether they want their bikes to be legal on the street or only for use on the track. Each will be handmade in the UK, and Crighton stated that only 25 CR700W will be built. If you want, you can check on the Crighton website.

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