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  1. #1

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    Vibra Tech Fluid Balancer Coupler

    I have one of these for the GPR. Will it fit the FZR engine? Or is the FZR's crankshaft too big?


  2. #2
    DP.'s Avatar
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    Fzr-s couplers are bigger, also the threads are different on the crankshaft than the intermediate shaft.
    The crankshaft is course thread, the intermediate shaft is fine thread.

  3. #3
    philip_gpr's Avatar
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    interesdting idea, I also have one of these

    it would be pretty easy to change the threads to match

    probably the bigger issue is you would have to undo the engine and slide it forward to install it

  4. #4

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    It would be a big plus if you can make this work Philip! I'm thinking that acceleration will improve and help the internals last longer, especially on higher horsepower boats.

  5. #5
    Moderator OsideBill's Avatar
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    Quote Originally Posted by philip_gpr View Post
    interesdting idea, I also have one of these

    it would be pretty easy to change the threads to match

    probably the bigger issue is you would have to undo the engine and slide it forward to install it
    one thing I noticed today when searching for some couplers, is that my Vibratech coupler is made for the old style rubber dampening biscuit used in the GP's. I had it on the bench with a billet coupler for a gpr midshaft, and a gpr style biscuit. The mate leaves some large gaps, this can be easily machined to mate up properly. Concerning cutting the internal threads larger, this can be done, but must be done right to maintain concentricity and perpindicularity to the shaft. The fact the coupler being made of steel, it is definitely more robust than the OEM cast aluminum coupler. You would need to mate a billet coupler on the midshaft.

    my $.02

  6. #6
    Addicted Member 5001craig's Avatar
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    Why not just go with the R&D Billet Couplers? That's what I'm doing.

  7. #7
    Mongoose's Avatar
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    Quote Originally Posted by Nino View Post
    I have one of these for the GPR. Will it fit the FZR engine? Or is the FZR's crankshaft too big?
    You could always sell it to me for my old skool gp project!
    BTW-tht's dibs

  8. #8
    mjh3ides's Avatar
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    I've heard of these couplers before but have never seen one. What are they for?...taking stress off the crank snout?

  9. #9
    hitman's Avatar
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    Quote Originally Posted by philip_gpr View Post

    probably the bigger issue is you would have to undo the engine and slide it forward to install it
    Is that even possible to change the couplers with the engine in the hull and just sliding it forward? Will you still be able to get enough torque on the couplers to break them loose when then engine is not connected to the mounts?

  10. #10
    Quote Originally Posted by mjh3ides View Post
    I've heard of these couplers before but have never seen one. What are they for?...taking stress off the crank snout?
    Vibratech has been around quite awhile. They are engine harmonic dampners. Each time a piston fires, it creates a frequency that can wreak havoc on engines. These frequencies, when not controlled can actually cause a crankshaft to break in half. Controlling the frequencies helps controls crankshaft flex, and increases horsepower and durability.
    Vibratech has a steel ring that floats in a viscous silicone type fluid, inside another steel ring that helps absorb vibration/harmonics.
    Really good stuff.. Ran one on my old BBC chevelle and picked up a full 1/10th in the 1/4 from that alone.
    You could actually feel the engine running smoother at all rpms.

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