Homemade TWIN CYLINDER Air-Powered Engine Goes REALLY Fast!

Lots of fiddly parts to make for this - even though it's a very simple engine. Makes you wonder how many go into a complicated one! Thanks to Will who drilled out and reamed the extra valves for me, as well as generally being helpful. Wouldn't it be fun to turn this is into a locomotive for the railway?? Lots more work to do first though..

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