[Lindsay Wilson] has a lawnmower engine which a few years ago he converted with the addition of a sleeve valve to run on compressed air. It’s ... is a small sidevalve single cylinder Suffolk ...

The engine is based around a single piston and runs on compressed air. The reduced parts count is a result of using the propeller axle as a key component in the engine itself. There are flat ...

Diesel engines have pistons that look different from the ones you'd see with a gas engine. There's a reason why that's the ...