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Bigger CV studs

Discussion in 'Performance' started by tillis, Nov 4, 2019.

  1. tillis

    tillis Active Member

    Messages:
    226
    Location:
    gold coast
    I'm running an ecotec commodore engine in my 74Bay and it is sweet as but have trouble keeping the CV joint in place...the problem is the studs or bolts...they keep working loose and snapping..I guess 200hp is overworking them. I am considering porsche 930 CVs but with flanges CVs drive axles and axle flanges looking at $1000 min. But..opinions here...what if i just fit the 10mm porsche 10mm studs? drill the Cvs drill and tap the box and axle flanges...too easy am i missing something? any advice appreciated......Rob (tillis)
     
  2. tintop

    tintop Well-Known Member

    Messages:
    565
    Location:
    Canberra
    I assume they are only snapping after they are loosening... are you torquing to 25 ft/lb? how about using loctite?
     
    cbus likes this.
  3. cbus

    cbus Well-Known Member

    Messages:
    12,044
    Location:
    sunshine coast
    Musings...

    Following the importance of clean surfaces for grip....maybe locktite the faces , cv/ flange ??

    Can't see a problem with changing to 10 mm.
    Would allow a higher torque.?
    What is the usual torque for the 10mm?

    Dowel's ?

    130 cv allows for greater articulation.
    Follow up with some suspension limit increases :cool:
     
  4. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    20,091
    Location:
    Bracken Ridge, Qld
    You could contact Indian Automotive in Penrith NSW - previous owner Kimm Garland had a V6 Supercharged in his twin cab ute - current owner Mikki worked for him and may be able to let you know what Kimm used :rolleyes:;)
     
  5. Barry

    Barry Well-Known Member

    Messages:
    3,885
    Location:
    Abbotsford NSW
  6. rstucke

    rstucke Well-Known Member

    Messages:
    1,147
    Location:
    Wamberal NSW AUS
    are you going to be able to drill the cv's, they're pretty hard for a drill
     
    cbus likes this.
  7. tillis

    tillis Active Member

    Messages:
    226
    Location:
    gold coast
    who knows have plenty of old ones to practice on or take to a machine shop...way cheaper than the whole porsche conversion... doing a long trip this weekend so taking spares
     
  8. onetrackwonder

    onetrackwonder Well-Known Member

    Messages:
    201
    Location:
    Central Tilba, NSW
    Hi Rob I had a 4.4L V8 in my van with standard CV joints and it travelled non stop towing a well loaded trailer for over 15 years and I never had a single issue so I suspect that there is more to this, however I also had a Porsche G50 5speed box and the axles were almost horizontal but I can't see the angle being an issue on your van unless it has been raised too much, perhaps the axle threads are now flogged out and the bolts are not getting a decent bite, you could also try drilling the heads of the cap bolts and lock wiring them along with some locktite, are you also using the serrated washers under the bolts, cheers Greg
     
    bern likes this.
  9. Wattie

    Wattie Well-Known Member

    Messages:
    960
    Location:
    Mildura. Victoria. Australia.
    I have a EG33 Subi with a auto, the T3 is also raised, I used new 12 point bolts with shakeproof washers, never had a problem although I did spin the pinion off the the pinion shaft once. :eek:
     
  10. tillis

    tillis Active Member

    Messages:
    226
    Location:
    gold coast
    Hey guys thanks for the input. I'm not a racer and think the standard CVs are fine but need to keep bolts falling out...perhaps i'll just start with a new set of bolts
     
  11. tillis

    tillis Active Member

    Messages:
    226
    Location:
    gold coast
    and yes the lockwiring might be the best bet!
     
    bern likes this.
  12. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    3,119
    Location:
    Seven hills
    Sure the thread in the gearbox or stub axle not stripped at all.:rolleyes: It might seem to screw in but is easily pulled out under load.
     
    oldman likes this.
  13. David H

    David H Well-Known Member

    Messages:
    5,205
    Location:
    newcastle
    The right washers do the best job with the right torque!;)
    Cheers
     

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