Skip to content Recently [Camden Bowen] took a swing at machining a two-stroke engine out of billet aluminium , following adventures in 3D printing such an engine , as well as building one out of parts largely sourced from a hardware store . The sketchiest part here is probably the use of only a basic mill and lathe, making the milling of certain shapes a definite OSHA violation. Two-stroke internal combustion engines are pretty simple from a mechanical point of view, with designs readily available. Add in a suitable material to machine and a modicum of machining and welding skills, and presto, you got yourself a not too shabby looking engine. Of course, back in reality things are a bit more hairy. Not only are there many different ways to produce the parts – with some coming with a time penalty, monetary penalty, or both – but there are also myriad ways to hurt yourself and/or others. Fortunately [Camden] scraped by with just some (expensive) lessons learned and a major ruined part.…