motor mount question

E

el_pescador

Member
whats the rule of thumb on the distance from bottom of keel to bottom of your anti-ventilation plate....some say 1 inch ,justhad a prop man say they want about 2 inches....any1 knows for sure....thanks
 
Well its suppose to be even, and if you have the right size motor it should line up fine.

If you are using a bracket then in changes 1" higher for every 12"back.
 
I have read that for each 6 inches of space between the transom and the motor gearcase, you go up 1 inch. I think that rule is whether you have a bracket or not.


Of course I have also read that they make 8 engine inflatable boats for dope dealers.
 
Yes should be even, what year boat do you have and what size motor shaft do you have??

If you have a 20" Transom with a 25" shaft motor on there it going to be to long, and if you have a 25" boat and have a 20" shaft you going to be to short

They did change the transom height threw the years.
 
I allways start high and drop it down( its easier to drop it than to pick it up) . Start out about an inch to an inch and a half, above the bottom, while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low. The V has a fairly deep hull, and its no light weight, i don't think your going to pick a lot of performance at top end by jacking the motor high up, but you never know untill you try it. When I start out too high, it eliminates that nagging notion" I wonder if it would be better the next hole up?". Keeps from screwing with it down the road.
 
you measure the transom from the V in the bottom to top of the transom,
You measure the motor from the top of the Cav plate to were the bracket touches the top of transom.

1" either way I don't think its going to mater!!

Stop thinking about it and start running it! ;)
 
spareparts said:
I allways start high and drop it down( its easier to drop it than to pick it up) . Start out about an inch to an inch and a half, above the bottom, while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low. The V has a fairly deep hull, and its no light weight, i don't think your going to pick a lot of performance at top end by jacking the motor high up, but you never know untill you try it. When I start out too high, it eliminates that nagging notion" I wonder if it would be better the next hole up?". Keeps from screwing with it down the road.
Click to expand...

And remember, spareparts is a professional.
 
spareparts said:
while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low.
Click to expand...

You mean like this? Its hard to tell from the still pics, but the spray you can see (not the boat wake) is shooting up in a nice V shape.


101_0121.jpg


101_0122.jpg
 
i called the motor and rigging guy for Parker he said the plate should be 1 inch below bottom of transom with a single but with twins the inside or center side of the motors should be 1 inch and the outside as the transom rises should be 2 inches. hope that helps.
 
Randleman, was that trimmed down all the way? If it still throws that v-spray up after you trim it up some, you may want to raise it up one hole and try it again
 
you never know till you try, that's why I allways put too big a prop on and jack the mottor up too high, and then back it back down. that way I'm not constantly wondering" maybe the next pitch up or the next hole up?"
 
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