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Author Topic:   Installing Transom Wedges to Improve Trim Range
mustang7nh posted 04-20-2003 11:44 AM ET (US)   Profile for mustang7nh   Send Email to mustang7nh  
88 20 OR- 88 Johnson 200
I'm raising the engine up tomorrow and installing negative wedges to get more negative trim. Question regarding how high I can go.

I've measured the cavitation plate (the one that goes directly over the prop, NOT the other one higher up that extends toward the transom a bit) to the very tip of the deep v-hull. I've got a distance of exactly 1 3/16 between the top side of the cavitation plate and the hull. High hi can I go? I'm planing on installing a Stilletto in another month. Current prop- OMC SS original, reconned 3 times, in need of another. 14.25 X 19 but after recons it now measures about 14 diameter with crude tape measure measurement. Thanks

Sal DiMercurio posted 04-20-2003 12:01 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Mustang, i'm up on the 3rd hole with no problems.
I'm not sure what your saying by saying the top of your anti vent plate is 1-3/16s away from the transom.
It's not the distance from the transom that counts, it's how much higher the anti vent plate is, in comparison to the bottom of the boat.
Put a 2x4 up against the bottom of the boat, slide it till it hits the lower unit, the "top" of the 2x4 should be approx 1/2-3/4" below the bottom of the anti vent plate.
It's my thinking you are putting negative wedges because the bow rides to high or the boat porpoises, if so, you have to much weight in the stern.
I had to make a battery box for my twin group 29 batteries [ approx 60 lbs each ] in my 129 quart Igloo ice chect in front of the counsel, partitioned it off & it sure makes a difference in how she rides.
I'd hold off putting those wedges until you put the new Stietto on the engine, because it's going to change the way the whole boat rides, you may need to remove them, so wait till the new prop is on.
jimh posted 04-20-2003 04:14 PM ET (US)     Profile for jimh  Send Email to jimh     
[Changed TOPIC; was "Question for Sal and others."]
mustang7nh posted 04-20-2003 04:34 PM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
the 1 3/16 is vertical distance not horizontal. There is a second plate that extends about two inches toward the transom off of the lower unit. This is a few inches higher than the cavitation plate that literally goes over the prop. Distance vertically from top of cav plate to the deepest point of the transom is 1 3/16 inches. So using your suggestion I can go up an inch and a half to three quarters.

Good point on waiting to put the wedges in and moving the dual batteries. The wedges' purpose was to push that bow down into a stiff breeze and head sea. I figured while I was lifting the engine higher, it was a good time to do the wedges. Thanks

Sal DiMercurio posted 04-20-2003 09:05 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Mustang, I also have a 15 hp Johnson kicker on the transom, but keep the 6 gallon tank in front of the counsel with a long fuel line.
My big engine is over 500 lbs.

Sal DiMercurio posted 04-20-2003 09:11 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
I pushed the submit button to soon.
After you put the Stiletto on & your running un-trimmed, watch it when you give her maximum trim, cause when she breaks loose you should be running well over 50 & she's gonna get a little squirlly on you, just keep your hand on the bottom of that throttle shaft & be ready to pull it back if you feel you can't control her.
Your gonna travel a loooooong way before she comes to a stop.
mustang7nh posted 04-21-2003 07:09 AM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
yeah that FICHT 200 and kicker have to be pretty heavy on the back of your 20. I'm been told my old 200 weighs 465

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