DSwatloski
Recruit
- Joined
- Apr 1, 2015
- Messages
- 3
I'm going to tinker with my Harris (see signature). I has a a 15" X 15" Pitch SS Power Tech cupped prop.
The boat loaded runs 22 MPH by GPS at max 4800 to 4900 RPM measured by a stock analog tachometer. The engine should turn upward of 6000 RPM. RPMs are too low.
When the engine is trimmed up at all it pushes water up between the lower unit on the engine onto the deck. I confirmed with Harris that the boat seller mounted it too low. It's set up for their tritoon performance model. The engine is presently as low as it can go on hole one.
Mods I'm making:
1) Under skin the boat stern to bow with 5052 Aluminum, SS Screws probably with neoprene washer, and permatex to keep them from backing out. I will put an 80 degree bend on the outer edges to close the gap between the deck and pontoons. I'll do some performance runs to see the impact on speed if any, GPS of course.
2) Raise the engine to hole three. Might be too high, but I sit very low in the water and I usually have five to seven people on the boat with two ice chests.
3) After some runs with the current prop at hole three, I will decide if the motor needs to go down to hole two. Cavitation and blowing out in turns will be my criteria.
4) If I'm not in the RPM range upper 5000's, I'll look to prop swap.
5) Potential Mod, depending on what I see after step three, I might send the ECU to Simon Motorsports for the tweak to the 115 to 120 HP range.
I'll be posting up pictures and comments as I go forward with this next week or two. I might have some GoPro video boat under the deck underway, before and after the underskinning.
Comments based on your experience are welcomed.
Dave
_________________
Dave Swatloski, Northern VA on Occoquan Bay
2015 Harris 220 CWX - 2015 Mercury 4-Stroke 90 HP Command Thrust, Road King Tandem Axle/w disc brakes
The boat loaded runs 22 MPH by GPS at max 4800 to 4900 RPM measured by a stock analog tachometer. The engine should turn upward of 6000 RPM. RPMs are too low.
When the engine is trimmed up at all it pushes water up between the lower unit on the engine onto the deck. I confirmed with Harris that the boat seller mounted it too low. It's set up for their tritoon performance model. The engine is presently as low as it can go on hole one.
Mods I'm making:
1) Under skin the boat stern to bow with 5052 Aluminum, SS Screws probably with neoprene washer, and permatex to keep them from backing out. I will put an 80 degree bend on the outer edges to close the gap between the deck and pontoons. I'll do some performance runs to see the impact on speed if any, GPS of course.
2) Raise the engine to hole three. Might be too high, but I sit very low in the water and I usually have five to seven people on the boat with two ice chests.
3) After some runs with the current prop at hole three, I will decide if the motor needs to go down to hole two. Cavitation and blowing out in turns will be my criteria.
4) If I'm not in the RPM range upper 5000's, I'll look to prop swap.
5) Potential Mod, depending on what I see after step three, I might send the ECU to Simon Motorsports for the tweak to the 115 to 120 HP range.
I'll be posting up pictures and comments as I go forward with this next week or two. I might have some GoPro video boat under the deck underway, before and after the underskinning.
Comments based on your experience are welcomed.
Dave
_________________
Dave Swatloski, Northern VA on Occoquan Bay
2015 Harris 220 CWX - 2015 Mercury 4-Stroke 90 HP Command Thrust, Road King Tandem Axle/w disc brakes
