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  1. #1

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    F-in Thing. Help

    So my S/C has been update to an 06 spec. with steel washers.
    My slip spec. is 60 inch LBS. on the bench. Put the S/C in the ski, retest it with out running the eng. and I can move it by hand. What`s the drive gear issue with this. Is the drive gear set up with a slip regulation also.
    My main problem is 7400 to 7700 rpm`s are all it will turn at a best of 62.4 MPH on GPS. The oil level has been set hot to mid point. Stock ski with no mods what so ever. Should run better than this. 10.4 hours on the clock.
    S/C washers blew at 9.6 hours. First WOT run ever and they took a shit.
    My main question is drive gear setup....Is it regulating too.


  2. #2
    Moderator Franko's Avatar
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    Your slip moment is way low for initial install. You are at 5 ft lbs, and it should be close to double that. At the upper speeds, the clutch is slipping and you aren't getting any boost. Make sure everything is installed correctly on the clutch. Then try shimming it.

  3. #3

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    Quote Originally Posted by Franko
    Your slip moment is way low for initial install. You are at 5 ft lbs, and it should be close to double that. At the upper speeds, the clutch is slipping and you aren't getting any boost. Make sure everything is installed correctly on the clutch. Then try shimming it.
    The S/C was installed and run for 2 hours. Pulled it out to check the spec after break-in. Before I removed it I could spin it by hand in the ski.
    Pulled it to shim it, and found it`s spec to be 60 inch lbs. What could be slipping inside the drive unit.

  4. #4
    Moderator Franko's Avatar
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    I don't think anything is slipping in your drivetrain. The only way to accurately test the SC slip moment while it's on the ski is to use a tool to hold the cam shaft in place while you test the SC.

    IMO, you need to shim it back up to 8-10 ft lbs and try again.

  5. #5

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    Quote Originally Posted by Franko
    I don't think anything is slipping in your drivetrain. The only way to accurately test the SC slip moment while it's on the ski is to use a tool to hold the cam shaft in place while you test the SC.

    IMO, you need to shim it back up to 8-10 ft lbs and try again.
    So what`s 8 to 10 foot LBS in Inch LBS.
    I came up with 8 foot lbs = 96 inch lbs. It`s at 60 inch lbs. that = 5 foot lbs. Jerry`s info reads 44 to 88 inch lbs. this thig is dead in the middle. Why would it slip by hand when it in the ski. Make`s no F-in sense
    Last edited by Big Red Monster; 07-14-2006 at 04:20 PM.

  6. #6
    Moderator Franko's Avatar
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    96-120 inch lbs. 1 foot lb = 12 inch lbs.

  7. #7
    Site Admin Green Hulk's Avatar
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    Where do you see my info at 44 inch lbs?

    You can turn the sc in the ski because of the reduction drive. You are actually turning the engine over. This is not the correct way to check for slip.

    What metal washers are you using?

    Who installed them?

  8. #8
    Red Devil's Avatar
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    Quote Originally Posted by Green Hulk
    Where do you see my info at 44 inch lbs?
    I think he is referring to the bottom part of this link Jerry...The next to the last paragraph on the first post that you put out...

    http://www.greenhulk.net/4tec/showthread.php?t=2238

  9. #9
    Site Admin Green Hulk's Avatar
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    Whoa! and those specs come right out of the OEM sc clutch installation manual. That is waaaaaaay too low.

  10. #10

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    Jerry. I bought the washers from Les. Your info states 44to88 inch lbs after break-in. I ran it for two hours. That`s broke-in. Pulled the S/C and held the gear. 60 inch lbs.
    Did the update my self. Slid the S/C back in the block and I can turn it with my fingers. Ski will not hit 8100 rpm. MPH is better the 62.3 mph. This is thing should run at least 8000 at 65 mph from all the other`s post.
    Do you really think I can turn the motor over with my fingers. What`s moving on the drive side.

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