Is My Motor Mounted Too Deep???

Discussion in 'Washington State' started by t_dub, Apr 20, 2012.

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  1. t_dub

    i've got twin rooster tails that come off my extended transom from either side of the motor. nothing i do trim-wise does anything to help. seems like the cavitation plate is buried too deep when up on plane and i'm not getting what i would expect fuel mileage wise. would bumping the motor up one hole help or do I have something else going on?

    sorry about the link. the video was bigger than the max allowed and i have no clue how to shrink it down.

  2. archy99

    I have the same issue...and plan to raise mine a notch or two. It was a stab in the dark as far as running depth, as my boat had never floated. The brackets can throw things off a bit too, making it hard to pre-determine where it needs to sit.
  3. goatram

    yup to low need to raise it up a hole or two. you should be able to see your Cavitation plate when running.
  4. Odin7

    My motor was too low. Raised it.

    HUGE improvement.

    P.S. HUGE improvement.
  5. Hawaiian Style

    Need's to go up for sure
  6. wood2turn

  7. t_dub

    that's what i was thinking, but nice to have an overwhelming confirmation.

    thanks fellas!
  8. elim

    Is there no other reason a boat would do this?What is the down side to having the motor to low other than probable poor fuel economy.
  9. goatram

    Slower speed as well as the poor mileage.

    Only reasons this would happen is something is wrong with the hull or something dragging on the motor.
  10. elim

    What kind of improvement did you get?Speed, mileage?

  11. elim

    how much of a difference will a low motor make?My motor shoots the same roster tails and I am deciding on raising it or not.Problem is I am out of holes so I need to re drill my bracket and need to know some real numbers to figure if it is worth it or not.thanks for any help
  12. Plus1

    you just snagged a water sprinkler
  13. trackerputnam

    Having the motor at the right can and will make a huge difference. If it is too low it is like dragging aroundsome anchors behind you. Rather than drilling new holes, maybe a "jack Plate?"
  14. elim

    You mean like a power jacking plate?I would think those would be pretty pricey for larger motors.
  15. elim

    I see you can get quite a few manual jacking plates.Any idea which is best for a 225 etec?I like this idea way better than re drilling.This way I can play with it until I get it just right.
  16. goatram

  17. Spicy Tuna

    Cavitation plate should be aligned with the bottom of the boat. Had to learn that with my Stratos. Little jackplate tweaks and the thing sails!
  18. t_dub

    had the motor moved up just one notch. them rooster tails are pretty much all gone and the boat feels like it's running smoother through the water, but maybe that part's all in my head. only had a chance to run it by myself, so kinda hard to stick my head over the transom and see what's really going on. definite improvement though.
  19. MarineHQ

    You might want to look at boat jack plate. Definitely, what I would consider the definitive source of Jack Plate Information. Here are some of the FAQs they answer.
    • What is a Jack Plate?
    • Why do I need a Jack Plate?
    • What is the difference between a manual and hydraulic jack plate?
    • What is Setback and how much do I need?
    • What is a Hole Shot Plate?
    • What is a Jack Plate Ladder?
    • What is a transom support plate?
    • What is a Micro Jacker Jack Plate?
    They have the boat jack plates through, but it's still a great place for a ton of information on jack plates.
  20. Master Chief

    Not to mention the added drag when the motors are too low causes undue wear and tear as the motors are laboring more. Similar to pulling a heavy load with a gas motor all the time has a tendency to add build up of carbon deposits and such. Get them up where you can utilize the efficiency of the outboard and longevity of the motors goes up along with economy ect....
    The further away from the bottom of the boat (clean undisturbed water flow) the higher you can run the motors and still maintain water pressure, jackplates are an awesome addition to a boat when the boat can handle the added weight of the fulcrum effect. You can adjust to all different conditions and loads at any given time, if you have hydraulic anyway. But manual will do the same thing, just keep a log of how the boat is loaded and adjust as needed.