Check this out Postino

[Olle]

Yep, that hose seems to be for compressed air. Even a diesel would need some kind of heat source to get started, and I didn't see any glow plugs. It would also need a lot of compression, which means head gaskets, piston rings and other parts I couldn't see that he used. Still, that's an amazing piece. Just imagine making all those tiny rocker arms, all exactly the same... "Ok, one down, 23 to go..."

[nukem556]

there are actual miniature v12 engines on Youtube that have ignition, fuel etc and run....even more impressive

[sheepherder]

I am mightily impressed by this engine...

But...Dual camshafts in the block, push rods, individual cylinder heads (no gaskets!), no carburation...

Sort of like a Jaguar V-12...This has to be his own design, rather than a copy of an existing engine...

...Or it's a very old V-12 engine design...