Pug - a simple piston valve engine

[SignalFailure]

Plans for a small 'square' (bore=stroke=12mm) engine with new-fangled metric dimensions. Possibly easier to get going than a rotary-valve engine, less fiddly than a slide-valve engine and a bit more interesting than a basic oscillating engine. Few parts, no difficult machining operations, suitable for a beginnner.

Drawings probably don't conform to CAD conventions but should be easy enough to follow!

View attachment pug.pdf