PTO/U-Joint ???
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PTO/U-Joint ???

  1. #1
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    Default PTO/U-Joint ???

    i'm really curious...back in the day, when we & every1 else ran dragsters with high gear only & Lenco's...we hooked them to the rear end with a solid 1 piece connection (no u-joints)...why cant this be done on a jet?...is it cause of the vibration factor?...let me hear from the "oldie/experts" on this

    FastRat

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    steelcomp was here
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    You can, you just have to get the alignment dead on. Some use Lenco drive lines on lake/river boats.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by steelcomp View Post
    You can, you just have to get the alignment dead on. Some use Lenco drive lines on lake/river boats.
    X2, to add to that, your stuff better be rigid as hell, the slightest movement in any direction and you are literally trying to "bend" horsepower, it won't last more than a few seconds if the power is high enough....

    I have seen it on some extreme systems with the rail package literally looking like a heavy duty Erector set...
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    I got a solid two peice drive shaft in my hydro. The whole thing is 5 or 6 inches long. The end of one half has like a gear on it and the end on the other half will recieve that gear part. When the two are slid together, you can still bend the shaft some. I think it came from Lenco. I hope that makes sence.

    Tim

  7. #5
    steelcomp was here
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    The Lenco's do allow for some slight misalignment and movement, but too much of either of those elements and things start getting real hot.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  8. #6
    Rollin With Fink fasterthanu's Avatar
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    I have one in my boat, I love it. Easy to disconnect and service. IMO much safer than u-joints.

    Mine is aligned dead nuts and has not changed in years of use. I do have a very ridgid full length boxed rail system.

    I keep up on the cleaning and lubrication and it's bulletproof in my application. I use my own homebrew of antiseize and high shock load grease.
    Last edited by fasterthanu; 08-30-2009 at 02:54 PM.

  9. #7
    steelcomp was here
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    Quote Originally Posted by fasterthanu View Post
    I have one in my boat, I love it. Easy to dissconect and service. IMO much safer than u-joints.

    Mine is aligned dead nuts and has not changed in years of use. I do have a very ridgid full length boxed rail system.

    I keep up on the cleaning and lubrication and it's bulletproof in my application. I use my own homebrew of antiseize and high shock load grease.
    How much extended run time do you see when you're on the water? With everything dialed in, is heat ever an issue?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Rollin With Fink fasterthanu's Avatar
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    Quote Originally Posted by steelcomp View Post
    How much extended run time do you see when you're on the water? With everything dialed in, is heat ever an issue?
    I only hold 13 gallons of fuel and that does not last long, by the time it may get hot I am refueling or parked taking a break. I have never noticed it getting hot, and I have checked it after reading some of those concerns.

    Hot meaning hot enough to change it's properties...

  11. #9
    steelcomp was here
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    Quote Originally Posted by fasterthanu View Post
    I only hold 13 gallons of fuel and that does not last long, by the time it may get hot I am refueling or parked taking a break. I have never noticed it getting hot, and I have checked it after reading some of those concerns.

    Hot meaning hot enough to change it's properties...
    Well I know the K boats run solid drive lines, so they can't be too restrictive to extended usage.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Rollin With Fink fasterthanu's Avatar
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    Quote Originally Posted by steelcomp View Post
    Well I know the K boats run solid drive lines, so they can't be too restrictive to extended usage.
    I am sure their are similarities to the input spline in my 4 speed munci, thats the same basic deal transfering power. I never grease that.... But the shock load may be different as the disc has springs that I believe take up some of the shock.. I dunno- have not thought about that much...

    Neil had the Lenco in the boat, so I am not sure that I would have bought it specificaly, I had it so I used it and it works for me...

  13. #11
    Senior Member Ahsumtoy's Avatar
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    Here's my Lenco. As stated, with proper alignment they do not run hot....

    Click image for larger version. 

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