[fso301]

where do the exhaust gases go? Are they just released as the piston and cylinder come apart? If so, that would be a terribly dirty engine. Anyone have insight into that?

Notice on the main page the entire unit is enclosed with what appears to be an exhaust manifold at the bottom.

[Two Kids' Dad]

Sure, but even being encased I don’t see how they keep the clean intake air separated from the dirty exhaust air.

Watching the video of the engine running on propane was pretty cool, though.