Company develops a 500cc 'one-stroke' engine with 120 BHP

The company is targeting the 'one-stroke engine' towards the EV segment as a range extender.

Spanish company - INNengine, has developed a unique engine which is said to be tiny yet powerful.

According to reports, the new engine comes in the form of a 500cc unit and has a single-stroke combustion cycle. The unique one-stroke engine weighs just 85 pounds (38.5 kg) and produces around 120 BHP.

The engine doesn't have a cylinder head, crankshaft, camshaft or valves. It does have four-cylinder banks, though totalling up to 8 pistons. The INNengine unit comes with opposed-piston motors - two pistons are placed in one cylinder bank, with the compression stroke of one being against the second, eliminating the need for a static cylinder head. Even with the unique piston arrangement, the engine has four combustion chambers, making it sounds like a conventional 4-cylinder engine.

Also, instead of a connecting rod, the pistons' movement is via a lobbed circular plate, which can be adjusted to change the engine timings and compression ratio. The spark plug and fuel injectors are placed in the middle of the cylinder bank.

The lobbed circular plate is arranged in such a way that one piston reaches the bottom dead centre slightly prior to the other. This helps uncover the intake & exhaust ports. The exhaust gases escape and create a vacuum inside the cylinder, sucking in fresh air from the intake port.

INNengine admits that the engine does have a combustion and exhaust cycle, technically making it a two-stroke engine. However, the company stated that the 'one-stroke engine' was suggested by an external ICE institution, which they found catchy and have stuck by since.

To demo the engine, INNengine installed it on a Mazda Miata. However, the company is targeting the 'one-stroke engine' towards the EV segment as a range extender.

Source: TheDrive