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

 

[James Barker]

I know this thread is ten years old, but I have always thought this home design to be so very doable and a good representation for a beginner to work off of.
BC1
Jim