Since I am not actually finished with my system, I admit my advice at this point is purely speculative. But I simply love the idea of running an engine at as slow a speed as possible, if for no other reason than I just think it is damn cool. If I could get a 3HP running at 150RPM I would!! I went out of my way to get a 650 RPM motor even though it cost me HP to do it. Slow diesels seem to me as though they would burn their fuel more thoroughly, create less polution, less wear on every involved moving part, and run longer and quieter than a faster engine. Even if I am wrong, it still sounds cool to the ear – isn’t that worth something.
Hell, if I wanted to be cost effective, wouldn’t I get a cheap 3600RPM high output motor and not be on this forum?
I will let you know once I am in production, in the meantime, slow is sexy! and I am sticking to that story!