The Napier is a complicated extrapolation of a basic opposed-piston engine. Your average “engine” has cylinders and pistons ...

But according to Avadi, the engine's lightweight build and innovative design make it far more fuel-efficient than a traditional ICE, which should greatly reduce the amount of harmful emissions ...

At 42%, the Avadi MA-250 engine has an efficiency on a par with the best current diesel engines, even though it burns petrol. "We've spent years re-imagining internal combustion engine design and ...