lobro axle shaft allowable mis-allignment | FerrariChat
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lobro axle shaft allowable mis-allignment

Discussion in 'Technical Q&A' started by 246tasman, Jul 4, 2007.

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  1. 246tasman

    246tasman Formula 3

    Jun 21, 2007
    1,448
    UK
    Full Name:
    Will Tomkins
    #1 246tasman, Jul 4, 2007
    I have a Ferrari special that was using a 400GT engine, manual gearbox, torque tube and back axle. We are replacing this drive train with one from a 575 Maranello.
    I have just found that the height of the centreline of the output flanges is 2 inches greater on the 575 transaxle than on the 400GT axle unit. I cannot lower the 575 unit any more, and wonder whether the CV joints can sustain this amount of constant mis-allignment . The shaft lengths will be around 14 inches giving an angle of 8-9 degrees at each joint. I expect we will not get away with fixed length shafts and would also like recommendations for the best type of variable length shaft. I could live with a shaft life of about 10,000 miles if neccessary.
    The car is road registered and will probably do 50% of its mileage on the track.
    Thanks in advance for any help.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,930
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Jul 4, 2007
    Wow -- sounds like a great project. I'm having a flashback that the LOBRO brand is made by GKN, but not 100% sure about that. Regardless, since these same joints are used on front drive suspensions that have to articulate over big angles for steering, I think you might be OK. Have a look at:

    http://www.gkndriveline.com/drivelinecms/opencms/en/products/cvj-sideshafts/sideshaft-cv-joints/

    It indicates that the fixed type can do ~50 deg (although that might be the total angle -- i.e., +/- 25 deg), and the plunging types can do a 50mm length change and a 22~31 deg angle depending on type.

    You might also see if you can find some life vs angle vs torque data in the GKN product catalogs just to see if it's a feasible proposition (even if GKN isn't the manufacturer).
     
  3. 246tasman

    246tasman Formula 3

    Jun 21, 2007
    1,448
    UK
    Full Name:
    Will Tomkins
    #3 246tasman, Jul 5, 2007
    Steve, Thanks for that. I'll see what I can find on the link.
     

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