On Wed, 1 May 2019 19:24:04 -0700 (PDT), Its Me
wrote:

You actually don't need much of that. I had a friend growing up that had a neighbor with a "collection" of those old single cylinder engines that fired once every 4-6 revolutions. They have almost no compression, and run just fine, sort-of. Similar to this:

http://prestonservices.co.uk/item/horizontal-single-cylinder-workshop-engine/

It was pretty cool to go over on a weekend and see him fire one up.

===

I think those were engines with "spark interrupter" governors. They
had big fly wheels with a lot of momentum. In order to maintain a
constant speed and prevent over revving, the governor would actually
disable the ignition until the speed came back down. I once saw a big
collection at a county fair in upstate NY, and they were a lot of fun
to watch. Running under load they'd generally fire on every
compression stroke.



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