SportPhish31
Seaman Apprentice
- Joined
- Jan 27, 2012
- Messages
- 42
All right guys I have a Palm Beach 181 whitecap cc. Its weighs around 1600 lbs, seats five and currently has a 88 johnson 140hp with a 2:1 gear ratio I think. I recently swapped the evinrude 115hp for the johnson 140hp. Its technically too much motor for the boat but its close enough for me. The whole reason I swapped was for more speed. The 140 has a 19 pitch four blade prop on it. So go lake test the boat and it runs similar speed to my 115. I was expecting more. My 115 would run around 30 mph with a 15 pitch three blade. The 140 with a 19 pitch four blade ran right at 32 mph per my gps but the motor would only turn about 4800rpm. So I threw on a spare 17 pitch three blade I had lying around and ran it at the lake and It actually ran faster. It ran around 33-35 mph. What is going on here? Notably i was a marine tech for a couple years so im fairly familiar with it all but im just looking for opinions. Shouldn't this 140 be able to turn a 19 pitch four blade? How can I get the most speed? What pitch prop should I buy?