mounting a mini jack plate

[marquette]

i am about to mount a TH Marine mini jacker on my boat. i have a 15 ft Tuffy tri hull that for some reason with a 28hp Johnson SPL the cavitation plate is 3 1/2 inches below the hull line. i have mounted a couple of CMC trim and tilts on other boats and i know that the set back changed the way the boat handled. this mini jacker is going to give a 4 inch set back. does anybody know if i should mount it so the cavitation plate is level with the hull or can i cheat it up an inch and still keep my prop and water pick up in the water at full throttle?

 

[tashasdaddy]

Re: mounting a mini jack plate

doesn't the 28 have the old style lower, i would not go more than an inch.

 

[marquette]

Re: mounting a mini jack plate

yes it does have the older style lower unit. are you saying an inch above or below the bottom of the hull?

 

[tashasdaddy]

Re: mounting a mini jack plate

i would not go more than an inch above, the water pump in that unit is high, in the bulge of the lower unit. i use to run my older motors with a 1x2 under the transom mount, in other words raised 3/4"