torque values? | FerrariChat

torque values?

Discussion in '308/328' started by gtbfever, Jul 17, 2007.

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  1. gtbfever

    gtbfever Rookie

    Jul 4, 2007
    33
    NJ
    Full Name:
    Scott
    what up with the values in the service manual? wheel torque says 10nm. the values dont seem to add up!
     
  2. jwise

    jwise Formula Junior

    Apr 2, 2003
    781
    Portland Maine
    I think it's kilogram/meter, not newton/meter. I could be wrong.

    10 kg/m = about 72 ft/lbs.
     
  3. FasterIsBetter

    FasterIsBetter F1 Veteran

    Jul 22, 2004
    5,855
    NoNJ/Jupiter FL
    Full Name:
    Steve W.
    You are correct.
     
  4. gtbfever

    gtbfever Rookie

    Jul 4, 2007
    33
    NJ
    Full Name:
    Scott
    so all the values listed are kg/m....i gather!
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,806
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Those torque units should be Kgm or Kg-m (i.e., force times distance) -- not Kg/m (which is force divided by distance)
     
  6. FasterIsBetter

    FasterIsBetter F1 Veteran

    Jul 22, 2004
    5,855
    NoNJ/Jupiter FL
    Full Name:
    Steve W.
    The version of the workshop manual I have uses "Kgm" to designate torque values.
     
  7. Artvonne

    Artvonne F1 Veteran

    Oct 29, 2004
    5,379
    NWA
    Full Name:
    Paul
    40 years of reading service manuals teaches you NEVER trust torque specs. Always search out a backup spec to double check critical torques. The worst damages done to cars are generally from overtightening bolts or assemblies, and snapping off a bolt in a casting. Its been years now, but I recall someone who torqued a spark plug over 100 foot pounds and broke it off in the engine, because the spec was wrong, and the person didnt have the knowledge to know it was wrong.

    The first day of shop class back when I was a kid the instructor had me clamp various bolts of various classes in a vice and twist them until they broke. Or put bolts into an aluminum casting and tighten until the bolt strips out the threads. The best thing you can do is both learn the feel of tightening bolts, and read a bolt chart. Then you barely need any specs out of a service manual.

    I barely use a torque wrench anymore, only for critical fasteners like head bolts, flywheels, rods and main caps, etc.. I dont even bother torquing wheel bolts. Read the owners manual, it simply says to tighten them. Its a race bred track car, built to drive into the pits and have the wheels changed out with an air tool and hit the road. Has anyone ever seen a pit crew tightening lug bolts with a torque wrench while the competition flys past? Is there a torque wrench in the tool kit to change the tire out of the road? Seriously, its not that critical, just critical you get them good and tight.
     

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