New motor makes a "fountain" with video example...whats up?

[anamealreadyinuse]

I recently installed a 20 HP Tohatsu 4 Stroke w/ Power Trim/tilt on my J-16.

When on plane I get this water shooting up on both sides of the motor (see video). I am able to lessen this by trimming the motor away from the transom but it does not completely go away and the farther I trim out the harder it is to get on plane. This water shoots so high up some actually gets back in the boat.

I'm concerned I did not mount the motor high enough on the transom? The motor is now bolted to the transom so I'd really don't want to re-drill holes unless absolutely necessary? Would trim tabs help this you think?

 

[metriccrescentwrench]

Re: New motor makes a "fountain" with video example...whats up?

It appears that you're getting spray from the AV plate. If that's the case then the motor probably could stand to be mounted higher.

 

[anamealreadyinuse]

Re: New motor makes a "fountain" with video example...whats up?

I was afraid of that...would trim tabs help since this is only occuring when underway? Maybe help lift the hull (and motor) up higher? I'm considering some of these fixed trim tabs from Nauticus http://www.marinesupplydock.com/Nau...-to-15-20-to-35-hp-Motors-Model-SX9510-30.htm

 

[TOHATSU GURU]

Re: New motor makes a "fountain" with video example...whats up?

Do you have a short or long shaft engine and what is the transom height?

 

[anamealreadyinuse]

Re: New motor makes a "fountain" with video example...whats up?

Transom measured 21" and I bought the 20" Long Shaft based on this: Frequently Asked Question: Shaft Length - Nissan and Tohatsu outboards

 

[boobie]

Re: New motor makes a "fountain" with video example...whats up?

Motors mounted to low.

 

[metriccrescentwrench]

Re: New motor makes a "fountain" with video example...whats up?

...would trim tabs help since this is only occuring when underway? Maybe help lift the hull (and motor) up higher?

I doubt it. I'll admit that I don't have any experience using trim tabs, but I can't envision a case where they'd somehow manage to lift the hull out of the water and magically avoid this issue. Your best bet is to just bite the bullet and get the engine adjusted properly.

 

[TOHATSU GURU]

Re: New motor makes a "fountain" with video example...whats up?

Motors mounted to low.

Indeed, probably by 1 1/4 inches.

 

[anamealreadyinuse]

I thought I had updated this...the motor was in fact too low. I raised the motor about 1 1/4 to 1/2 inch and it fixed the problem immediately. Later on, I did install those gas trim tabs and they are worth EVERY penny, they helped with getting on plane faster even with too much weight aft. Thanks for the advice on this, it really saved me alot of time..