Drive Shaft Alignment
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Drive Shaft Alignment

  1. #1
    Senior Member DuaneHTP's Avatar
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    Default Drive Shaft Alignment

    Interesting Video
    Video: driveshaft angle and phasing | Mac's Motor City Garage

    Every boater should see.

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    Senior Member zacho!'s Avatar
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    Wow- I wish I would have seen that years ago. Im suprised nothing is said - at least that I heard - that these joints need a bit of angle to work properly... I could be wrong but, years ago I set my Engine perfect parallel to the shaft angle. It made a horrible noise but went away after idle. Via research i learned a little 1*-2* angle is good.. haven't ran the new set up yet...

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    Senior Member Hass828's Avatar
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    Thanks for postng Duane.
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
    [email protected] first pass

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    Jackwagon Patrolman Rexone's Avatar
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    Spicer recommends 1-3 degrees. Shafts parallel are a must. Many threads on here on this subject. Good video.

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    Default Pictures/videos...

    Pictures and videos are worth a thousand words... Very good example of how NOT to do it, as well as the correct way... Going back a few decades I learned to mark, with a centerpunch, the "phasing" of the components. A simple mistake of switching the "yoke" 180* during u joint replacement CAN result in mis aligned, as well as out of balance drivelines... Good video...
    Ray
    LOUD BOATS SAVE LIVES

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    Quote Originally Posted by Rexone View Post
    Shafts parallel are a must.
    With all due respect, that statement is only half true. The video doesn't show the other possible configuration: The input and output shafts each form an angle less than 180 degrees to the intermediate shaft, and those angles are equal to each other. In other words, a shallow "U" shape.

    Rear wheel drive passenger cars used this configuration to help reduce the height of the driveshaft "hump".

    A jet boat driveline can be set up in the same manner, if that particular configuration is preferable....

  9. #7
    Senior Member Boat 405's Avatar
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    Directly from Dana Spicer

    Click image for larger version. 

Name:	joint life vs angle.jpg 
Views:	167 
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ID:	674962
    Boat 405.

  10. #8
    Member 67CarlsonChryslerVdrive's Avatar
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    When I was racing my barracuda I spent a lot of time getting the right pinion and therefore driveshaft angle. Along with that came tailshaft angle. All of this seems to be explained in the video. Great video but what they do not explain is that in automotive scenarios the motor and rear end change angles on acceleration and deceleration and there must be a preset angle to the system so that it is lined up under normal conditions. For the barracuda I needed the driveshaft angle set almost straight under load so that it would transfer the torque through to the rear wheels and not lose any in the binding of the u-joints. I don't see all that much movement in the driveshafts of the boats as all the driveline components (IE Engine and pump or gearcase) are mounted to a solid frame. Or at least should be.
    67 Carlson V-Drive retired Circle track race boat Originally equipped with a 426 Max wedge with a cross ram intake, getting a 440
    74 Chrysler Conqeror SIII Superbee Jet 340, Has a Chrysler jet pump and 340 long gone getting a 360 Magnum

  11. #9
    Senior Member DuaneHTP's Avatar
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    I don't see all that much movement in the driveshafts of the boats as all the driveline components (IE Engine and pump or gearcase) are mounted to a solid frame. Or at least should be.
    Exactly! That's why I thought the boaters might find it interesting. In other words if it's set up with parallel drive and driven angles it will always be right. If it's set up not parallel, think about that SS impeller having to speed up and slow down 6000 (RPM) times a minute. Also think of the unnecessary strain it would put on the splines of the shaft, yokes and the clutch of a Jetaway. (The speeding up and slowing down also robs HP).

    Just food for thought. Good discussion here guys.

    Thanks for joining in.
    Last edited by DuaneHTP; 01-21-2015 at 12:58 PM.

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