motor,cavatition plates and not being correct

beradtke · #1 06-10-2007, 09:55 PM

hi all i have been reading and reasearching about this problem my boat has. i have been using it for a few months now. All seems good about the boat,well i read a post a few weeks back where somebody had posted that the cavatition plate is to sit level with the bottom of the boat when fully trimed down. well this sparked my thoughts. well when my motor is full trimmed down,the cavatition plate sit 2-3 inches higher then the bottom of the keel.this being said my boat has a "bracket" on the back of it.( 2 peices of 3/4 plywood resioned to gether) plus a manual jacker plate. the plate and motor is as low as it can go. is this truly hurting my engine performance or is this some thing that should be resolved quickly? thoghts comments

eggsuckindog · #2 06-11-2007, 02:58 PM

Actually the Cav plate should be as high as it will run without Cavatating. Your being on a bracket means the water comes up off the hull to the props because of the setback. Check when your running and see where they ride, you might want to go higher, you just don't want the extra drag in the water, did this answer it??

beradtke · #3 06-11-2007, 04:56 PM

It kinda sortof maybe answered it.I get what your saying I just dont understand the thought of haveing the motor out hat far. I thought it would need to be in there farther for the water pump to work right,and for boat to steer better. i will check it next time we go out.The fun part will be telling my g/f to drive the boat fast by herself.

eggsuckindog · #4 06-11-2007, 07:32 PM

The water pick up is well below that, the cav plates are what the name says but that doesn't mean they drag under water. There is a formula the bracket guys use for the set back to get the motor height correct but I'm not positive what it is since I don't have one. I think its like 1" above for each 12" of set back, but don't quote me on that, if you have no cavatation at any time maybe go up a hole-higher is better.

beradtke · #5 06-12-2007, 06:35 AM

well for 12 inches of set back you go up 1 in. mine is only moved back 12 max so dang i wish i could post so pics so yall could see what i am talking about.