Georgesalmon
Lieutenant Commander
- Joined
- Apr 14, 2012
- Messages
- 1,793
I have a 19791/2 115hp merc inline six. Running on a heavy glass 20' boat. I'm getting 4800rpm at WOT. That is the minimum engine recommended rpm. Range is 4800-5300. Is this OK? Got a 15p 4 blade prop on it. The new merc AL one. I am happy with the performance overall. Top speed is 31mph GPS. Hole shot good. Only thing worrying me is the rpm at WOT. Would it be better for the motor if I was closer to 5300? Gonna buy a spare prop and thinking about a 13p. Theory says that would get me to 5200ish rpm at WOT. Another thing is that I don't run WOT much, Lake Michigan won't let me. So is it also better if the engine runs faster at 1/2 or 1/3 throttle? Last Sat got caught in a thunderstorm and ran 5 miles at just 10-15 mph using throttle to keep me on top (most of the time) of some pretty big following waves.