K
Keith Fullenwider
I changed the prop on my Cat 38 and I think the RPMs are too low when motoring. The prop that was on the boat when I bought is was a Martec 2-blade folding. I contacted Catalina about a fixed three blade...they said put on a 15X13. I did so but the max RPMs I get out of the engine is about 2200. The engine will rev to 2800 without a load. At 2200 RPM the boat will do about 6.75,. I don't get any smoke, but the engine temp will go up to about 180 or so. The prop works great, smooth, good control in reverse, etc. I am about to change out the exhaust system, because I suspect backpressure in the system. Would this affect the RPMs?? The engine is a Universal 3-cylinder, 24 hp. Thanks for any input. KF2