On Sat, 22 Aug 2009 22:11:24 -0400, Wayne.B
wrote:

On Sun, 23 Aug 2009 07:28:33 +0700, Bruce In Bangkok
wrote:

Given that literally millions of air cooled lawn mowers have operated
successfully with little (probably no) maintenance all over the world
it is doubtful that air cooling is going to be a problem.

As long as the engine is operating in open air, not enclosed in a box.
It would take a lot of forced air ventilation to get successful
cooling within an enclosure. Unfortunately I think most people would
want it in an enclosure for safety and noise reduction.

Assuming that the "enclosure" is more then an apple crate you are
correct however a friend is running a small 2-stroke, air cooled,
generator under what looks like a crate. Got holes in both ends to let
the air in and out and a top to keep the rain off. Seems to run O.K.

I don't think the O.P. was talking about anything but just putting a
motor in a boat. Given the size of the motor it sounded like, maybe a
small row boat, and I suspect, given that he doesn't mention the
exhaust, he isn't thinking about noise at this stage. Besides, if you
don't have to row, who cares about the noise :-?

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)