The idea was to make a single cylinder 4-stroke and to make it simple with a poppet valve. Not sure my terminology is correct here, what I mean is an actuated exhaust valve and an intake valve that opens under depression in the cylinder.
- Connecting Rod – a lightweight aluminium conrod.
- Crank – challenging with the timing gear machined as one part
- Crankcase – this has been a joy to machine….until I had a major glitch and I melted the crankcase and the brackets: Crankcase Catastrophe. Making new brackets and fixing those brackets required a special countersink extension.
- Engine Brackets – to allow the engine to be bolted down.
- Studs – aligning and fixing the cylinder to the crankcase.
- Cylinder – machining the cooling fins is not so easy.
- Head – I started with an aluminium head and after lots of machining swapped to steel.
- Liner – a mild steel liner
- Flywheel – simple mild steel flywheel
- Piston – a cast iron piston and liner, a great pairing.
- Spark Plug – I bought a 1/4″ x 32 plug.
- Timing Gears – machined by me on the Hobbymat
I’m listing all of the parts of this poppet valve single cylinder engine as I move through the design and build stages. This does mean that I’m having some issues and the occasional complete catastrophe, but I hope this process is of interest in it’s own right.