glenn property of pam
Commander
- Joined
- Feb 17, 2012
- Messages
- 2,906
stratos 16.2 foot with a 86 evinrude 120 hp 4" jack plate fixed and whale tail
prop is stainless 19' pitch
my engine would not rev out but ignoring that the boat ran fine and with 4 people on board (max weight allowed) the boat ran fine and at 4800 rpm it would run 38-40 and it reacted to trim correctly
I found that the carbs were not adjusted so they never opened 100% and I fixed the problem.
Now 3 people on board at 4200 rpm I get 34.5 and can trim correctly at 5500 I get 38mph and I loose the ability to trim the nose up.
another problem I have is the prop has acted like its spun. After slow trolling I go wot and the engine revs (there is restriction so something is moving) but the boat doesn't move. I back off to tick over then go wot again and it takes off fine. theres seems no set pattern to this as it may happen then again another time it does not. Im wondering if exhaust gases are under the whale tail and that's causing mass slip but if that was the case then it should clear the gas in a few seconds and the prop should bite.
Everything is pointing from what I have read to a motor that's mounted to high and as the weight decreased in the boat the boat lifted the motor higher in the water at higher speeds and the prop is breaking the surface. But that really doesn't ans what's going on with the prop acting like its spinning at low speed when I go wot.
prop is stainless 19' pitch
my engine would not rev out but ignoring that the boat ran fine and with 4 people on board (max weight allowed) the boat ran fine and at 4800 rpm it would run 38-40 and it reacted to trim correctly
I found that the carbs were not adjusted so they never opened 100% and I fixed the problem.
Now 3 people on board at 4200 rpm I get 34.5 and can trim correctly at 5500 I get 38mph and I loose the ability to trim the nose up.
another problem I have is the prop has acted like its spun. After slow trolling I go wot and the engine revs (there is restriction so something is moving) but the boat doesn't move. I back off to tick over then go wot again and it takes off fine. theres seems no set pattern to this as it may happen then again another time it does not. Im wondering if exhaust gases are under the whale tail and that's causing mass slip but if that was the case then it should clear the gas in a few seconds and the prop should bite.
Everything is pointing from what I have read to a motor that's mounted to high and as the weight decreased in the boat the boat lifted the motor higher in the water at higher speeds and the prop is breaking the surface. But that really doesn't ans what's going on with the prop acting like its spinning at low speed when I go wot.