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

Along with a TIG welder and mechanical ingenuity bordering on genius-level, all of which come to bear on this fridge compressor to four-stroke engine build. The video posted by [Let’s Learn ...

The balanced crank, balanced flywheel ... but they require more maintenance. Four-stroke engines are more fuel-efficient and reliable, but they are heavier. The size of the engine is another ...