transom heights

[jonill17]

I have a 1998 lund 1900 pro v and I just put on a yamaha 150 vmax. Someone noticed that the cavitation plate does not line up with the bottom of the boat, it is a couple of inches to short. I have had other motors on this boat and they have been fine and this motor seems ok has goods water pressure. I do have some cavation once I get up to top speed and trimed out. On all of the motors I did have much to trim it up. Could I put a jack plate on to lower it a couple if inches and will this let me trim it up more and stop the cavation at higher speeds.

 

[jonill17]

Re: transom heights

anyone have any ideas

 

[JB]

Re: transom heights

I wrote a reply to this before I moved it. I guess I did something wrong and my reply didn't post.

Most engines can be repositioned vertically over a span of several inches. Check if you have room to do that. I would still keep the anti-ventilation plate about an inch above the keel.

You are not getting cavitation, you are getting ventilation, which sounds the same but has very different causes. As long as it only happens when you trim out too far it shouldn't be a big problem.

 

[parrfive]

Re: transom heights

What kind of prop do you have and does it have any cup in the blades? A set back would be fine and alot less money.

 

[jonill17]

Re: transom heights

Ok thanks it only happend when I trim it up. I run a 23P 3blade stainless not really sure if there is much of a cup, would a 4 blade change anything. I am pretty sure it is only a couple of inches from the bottom of the boat so it should be fine then.