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I have the propane valve fully open during these tests. One thing I'm curious about is the ratio of propane to butane other people who have successfully started this thing use. Here they sell 60:40, meaning the mixture only has a vapour pressure of about 70 psi at 20c, whereas 100% propane has a vap...

Thanks for the suggestions. I have made an unregulated LPG adaptor, added a spark plug to the back of the combustion chamber, and welded the gaps in the intake flares and filed them relatively smooth. I'm still having some trouble getting it to start. In metiz's videos the pops and bangs sound a lot...

I have built this engine and over the past week have been trying to get it to start up, with no success. The first obstacle I encountered was hooking up the engine to a propane cylinder. I couldn't find any POL fittings that adapt to 3/8 LH UNF, or any other common fuel hose fitting, and so the best...