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I am VERY up on the Bourke engine, I even have a reprint/photocopy of his somewhat rambling book with nearly all the details on building one with his skipper barrings, scotch yoke dual in line pistons etc.
Like a diesel they need very good strong metals...it covers his 400CI 4 cylinder engine and how it kept breaking transmissions and drive shafts.
He built a number of them, and there has been a number of recreated versions...I for one do not know why no one has followed up and built a bunch of them and perhaps cars to use them.
I have NOT read any reason why they are not being used now a days. My guess is they do not last well, such pressures and power must tear things up fast.
BUT as I do not have millions or billions, IF I did I would simply but a Tesla, I am just trying to build a vapor system to keep the ICE running a little longer until the electric car takes over.
When I started my quest into trying to get high MPG 30 years ago the electric car was a golf cart....
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