Strange engine configurations that never reached production always makes for interesting reading. Here are our favorites.

Rotary engines have plenty of quirks, but they can still put up some impressive power figures. Here are some of the most ...

The small 1.3 liter 232 horsepower two rotor engine in the 2011 Mazda RX-8 gets worse fuel economy (16 city / 23 highway) than the 6.2 liter 455 horsepower V8 engine used in the 2015 Corvette ...

The car’s 2.6-litre four-rotor unit produced 697bhp at 9000rpm and 448lb ft of torque at 6500rpm in race trim (Mazda claims 845bhp could be produced in qualifying spec), ensuring the engine’s ...

Both 787Bs were powered by 2.6-liter four-rotor engines that were detuned to 700 horsepower. Afterward, the FIA announced that rotary engines would no longer be allowed at Le Mans.

One-off Pininfarina NSU 2 Porte + 2 with a Wankel engine is ... retaining the original two-rotor Wankel engine which produced 113 hp back in the day, funneled through a three-speed automatic ...

The Renault Sport Spider was never officially sold in America, but a rare example is up for grabs in Virginia and going up ...

The Engwe Engine Pro 2 is an all-purpose e-bike that’s easy to transport. It’s a fine urban transportation alternative or ...

The tiny single-rotor 330cc ... range of the Mazda 2 EV before needing its small fuel tank filled up. At this early stage Mazda is coy about the exact capabilities of the engine and the timescale ...

Every few months, it seems a rumor crops up about plans from Mazda to revive the rotary engine. Last November, its CEO said the only way another one could happen is if the project was profitable ...

The latest version adds a rotary engine to its compact predecessor, with prices ranging from 4.2 million yen ($28,000) to 4.9 million yen after tax. The MX-30 Rotary-EV will arrive on the Japanese ...

There's a hybrid system borrowed from Toyota, plus a copycat "strong hybrid" setup to come from within Mazda eventually, maybe with rotary ... a 2.5-liter four-cylinder gas engine paired with ...