Converting car engine to aero engine

Factual Questions
21

And then you have the single blade propeller, the hubs a monster. Balance is easy but that side load is a bitch. Still the quietest and most efficient prop, just not really practical… Bawahahahaha

Got the rotary engines, those are fun. ( Sopwith Camel anyone? )

Anyone remember the Mercury out board engine in a scaled down P-51?

22

What about the other way around? Could you convert an aircraft engine for use in a car?

23

IIRC the Tucker had a water-cooled Franklin.