It is a bulky design, but without camshafts and valves, it wouldn't suffer from being overweight. The unusual engine design resulted in multiple championship titles and established two-stroke ...

Others have ended up following technical blind alleys, but all offer an insight into the engineering thinking required to push car design forward. Here’s our run-down of unusual engines in order ...

But that’s by no means the only way to make an engine, and one of the slightly more unusual alternatives comes ... The free piston engine, a design with opposed pistons working against ...