I just realized he did the cam shaft without any computer aided machining tools.

I think it's running on compressed air?

Not sure what fuel this thing is using, but diesel engines don't use spark plugs. The fuel spontaneously ignites from compression, which is why the first cars had a crank on the front.

air

it would need an electrical line to heat up the glow plugs of an oil burner.

plus the hose going in is clear of anything.

But air would work on the same principle, or close to it. You can get the metal parts the right size, but making spark plugs that size would be very difficult to machine. Plus, having an engine like that run indoors on ordinary gasoline would require o-rings, a radiator, and a lot of complexity that would probably be very dangerous for something that size.

Still, this is an amazing piece of work.

You can see him oil it, I can't find the time mark immediately. It's a little round disc with a tube coming out of it.

I like to think he just knocked this out on a weekend to send to some rival, and they build increasingly smaller engines as some sort of feud.

Funrelated fact: I STILL catch myself reading the title as "Fully functional miniature V12 vagina." There is no such thing as adulthood.