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  1. #1
    Hydrotoys's Avatar
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    Driveshaft Advice...

    Just looking for some ideas...

    Looking to put a larger coupler on the Polaris MSX driveshaft. One thing I noted is that the driveshaft is allowed to "walk" front to back, since it is not pressed into the bearing assembly. This could be a long term reliability on a 250hp setup since the biscuits tend to push out of their fingers.

    I'm looking to have ted make it so that the assembly (with the new larger coupler presses into the bearing assembly, similar to the Yamaha coupler.

    I've come up with the following list. What am I missing?

    Pros:
    -No front/back movement.
    -Splines in prop are not chattering back/forth.
    -Engine doesn't see any lateral forces on rear main bearing (other than the biscuit itself.)
    -Wear should be reduced since fingers aren't moving around.

    Cons:
    -You have to remove engine to get out driveshaft.
    -Alignment (which is already crucial on this setup) becomes more so. Will engine movement cause faster bearing wear?
    -Hull attachment wear?
    -Seal Maintainence?


  2. #2
    fabrication guru rapidacceleration's Avatar
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    any pics or sketches?

    we used a set of yamaha 66 couplers (later switched to billits) in my conversion with a split driveshaft setup, two rxp driveshafts altered and threaded for the yami couplers. it has a liquid cooled berring on both sides right behind the pto's to help support them. havn't seen to many issues useing the couplers, but i do replace the puck every time its apart just for preventive maintanance.
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  3. #3
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Mark,On the polaris driveshaft,they use a rubber button,on the end of the driveshaft that touches the prop,when the pump is tighten it squeezes it to prevent slapping fore/aft. #1 in photo.

    Just another thought to keep the fingers from walking out from between,how about a sleeve that could be slipped over each side of the coupler an a retaining screw/s tighten down.
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  4. #4
    cheatin' piston popper addicted's Avatar
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    so in the polaris the pump side coupler is threaded directly onto the driveshaft?

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by addicted View Post
    so in the Polaris the pump side coupler is threaded directly onto the driveshaft?
    Only on the Polaris MSX models does the coupler thread onto the drive shaft. All other Polaris models use splines on both ends of the shaft.

    There is a thrust fitting (item 5) where the MSX shaft threads into the pump side of the coupler.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    ...Looking to put a larger coupler on the Polaris MSX driveshaft...
    What factors lead to retaining the 148mm Polaris jet pump, vs. using a Yamaha or Sea-Doo jet pump?

  7. #7
    Hydrotoys's Avatar
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    the simplicity factor.

  8. #8
    cheatin' piston popper addicted's Avatar
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    Mark, before you redesign all this, maybe oside can model the polaris coupler and calculate the torque capacity? the 4 tec only puts out around 150 ft-lbs. My gut would say keep the polaris couplers, and modify my driveshaft design to accept them.

  9. #9
    Hydrotoys's Avatar
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    You might be assuming too much.

  10. #10
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Mark,Al and a few others are running the Matrix Stage II's at well over 200Hp and no problems, Then Pirate has been abusing his 200HP Matrix in Brutal offshore conditions wide open with no Problems. And he has put more then a few hours on that Dog.

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