Motor to low

[troyr]

I think I know the answer but wanted the experts to see. The cavitation plate is about 5" under water, I get this huge wash up while WOT. I'm pretty sure it's to low?

 

[Georgesalmon]

Re: Motor to low

take a picture of the back of your boat out of the water. what is the relation of the cav plate to the bottom of the hull?

 

[troyr]

Re: Motor to low

The cavitation plate sits about 4" under the bottom of the transom.

 

[Georgesalmon]

Re: Motor to low

Sounds like a 20" motor on a 15" transom? Or 25" on a 20" transom.

 

[troyr]

Re: Motor to low

I'm guessing that also. The boat is new to me so I was just trying to tune it up some.

I can't do anything about the motor being to long, so I'll just raise it as much as I can and deal with it. It's a JC 24' Sportfish and with the current set up goes right at 30mph with a full tank and 2 people on it, so it's not that bad. I just wanted to make it better.

 

[crb478]

Re: Motor to low

Where does the AV plate run while under way at speed? If it is even with the top of the water you are probably ok. The wash may mean it is too low, but try raising it one hole at a time. If you are getting 30mph you either are not to far off or you have a really big motor.

 

[troyr]

Re: Motor to low

I can't see the AV plate while at speed because of all the back splashing.

It's a 100hp Mercury on a 24' pontoon.

 

[MH Hawker]

Re: Motor to low

You can build a taller transom if needed thats the beauty of a pontoon boat.

 

[MaPaHa]

Re: Motor to low

I use a 5 inch jack plate on mine and you can make adjustments as needed. It also puts the motor back and tends to help performance. Look at the bottom of the motor mounting flanges and see if it hangs down outside the footprint of the transom. With the water squirting up like that I wonder if it's catching water because it hangs down.