Engine Height/Depth

[phipps]

We just repowered our 1977 24' Sylvan pontoon. In the process I rebuilt the transom.

The old motor was a 28hp and they had the transom raised up one hole from being fully seated. My new motor is a 50hp and I fully seated the transom.

I'm wondering if my motor is too deep in the water. I get tons of splash coming off the new motor. I have attached a couple photos of how it sits when not running. I think it looks too deep.

Thoughts, suggestions and ideas would be greatly appreciated!



Thanks,

Gary

 

[Georgesalmon]

Re: Engine Height/Depth

Every boat/motor combo runs a little differently. Best thing for you to do is raise the motor one hole and try it out. Looking at pictures won't mean much unless its really bad. Like a 25" leg on a 20" transom.

 

[phipps]

Re: Engine Height/Depth

When I'm out on the lake running, what should I be looking for? ie how deep should the leg be in the water? Should the cavitation plate be visible/not visible?

 

[lakegeorge]

Re: Engine Height/Depth

We just repowered our 1977 24' Sylvan pontoon. In the process I rebuilt the transom.

The old motor was a 28hp and they had the transom raised up one hole from being fully seated. My new motor is a 50hp and I fully seated the transom.

I'm wondering if my motor is too deep in the water. I get tons of splash coming off the new motor. I have attached a couple photos of how it sits when not running. I think it looks too deep.

Thoughts, suggestions and ideas would be greatly appreciated!



Thanks,

Gary


View attachment 209477

View attachment 209478

Gary, The cavitation plate on your motor should be even or 1/2" below the bottom of your boat. Yours looks way to low.

 

[phipps]

Re: Engine Height/Depth

Gary, The cavitation plate on your motor should be even or 1/2" below the bottom of your boat. Yours looks way to low.

Since it's a pontoon, when you say bottom of boat, do you mean bottom of the pontoons or transom?

 

[MH Hawker]

Re: Engine Height/Depth

The motor height is set to how it is while running at WOT, not how it looks while its sitting. It should be set so the cav plate is just under the surface while running, how ever due to all of the turbulence deeper is better. The best way I have found is to start deep and raise it a hole at a time till it starts to lose the bit or blows out then drop it back down.

 

[phipps]

Re: Engine Height/Depth

The motor height is set to how it is while running at WOT, not how it looks while its sitting. It should be set so the cav plate is just under the surface while running, how ever due to all of the turbulence deeper is better. The best way I have found is to start deep and raise it a hole at a time till it starts to lose the bit or blows out then drop it back down.

When you say raise it a hole, are you meaning the holes on the motor bracket?

 

[Georgesalmon]

Re: Engine Height/Depth

yeah, most motors have three holes so you can raise the motor an inch or so at a time for best performance.