"Revolutionary 500cc 'One-Stroke' Engine Transforms Miata Performance"

Spanish company INNengine has developed a powerful 500cc opposed-piston engine that weighs just 85 pounds and produces 120 horsepower. The engine features a single-stroke combustion cycle and has no cylinder head, crankshaft, camshaft, or valves. It utilizes a unique mechanical configuration with eight pistons and four combustion chambers, resulting in improved engine balance and reduced noise, vibration, and harshness. While the engine is not likely to be directly used in cars, it could serve as a range extender for electric vehicles.