The traditional Wankel is limited to 12:1, the liquid piston x-engine is not. That’s why they can run diesel, like in their XTS-210 compression ignition engine. Still, it’s not perfect.

I have already written about LiquidPiston and its XTS-210, but Avadi's idea is even more striking: it is a reciprocating engine that works as a rotary. Imagine an ICE with a single piston.

Rotary engines gained niche appeal and status with the Mazda RX-7 sports car, first launched in 1978. Mazda continued to prove the true potential of rotary engines by winning the Le Mans 24-Hour race ...

All-new type of gas engine offers incredible power-to-weight U.S. firm Avadi – using a Quebec inventor's design – has developed a sort of "rotary piston" ICE that could revolutionize small engines ...

Pistonless rotary engines are the engine family to which the Wankel engine belongs. These engines do not use reciprocating pistons that travel back and forth within a cylinder.

Unlike piston engines, Rotary engines don’t require valves to run. Here’s how rotary engines work and why some designs have incorporated valves.

Japan’s Mazda was once the world’s only automaker to use Wankel rotary engine tech in its cars. In late 2023 it released its first model in more than a decade to run on a rotary engine.