[Carbroke]

Sorry, forgot to add this to my other post.

An airplane application has another aspect those who don't fly don't often think of and that is the fact that when you are tooling along on the road trip in a car, if the engine quits, you just pull over to the curb and check it out.

I'd look at dual ignition system made of a magneto and a normal ignition system (like the old Republic Seabees had for instance) and I'd use a modern hall effect system rather than the Ford breaker points style.

And I'd also look at your oiling system as applicable to use in flight where roll and climb is more than what is experienced in a car application.

A lot of folks aren't aware that generally a water cooled engine is lighter than an air cooled version, and shock cooling is a real engine killer which is avoided in a water cooled unit. So it has it's merits OK.