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V6 Crankshaft Info

Discussion in 'V6 Development And Modification' started by 383 hatch, Nov 4, 2007.

  1. deanos70

    deanos70 Member

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    so when changing from an auto to a manual, can dowel holes be drilled into the auto crank and dowel pins fitted, or will this mess with balance, just thinking of the issue of the extra support of the pins.

    the alignement holes on the flexplate and flywheel should be in the same spot ????

    thanks
     
  2. OZ38

    OZ38 Member

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    Yes the dowel holes can be drilled into a auto crank, but the alignment will need to be done correctly. We used a hardened centre from a dual mass flywheel which we cut open. This was bolted to the end of the crankshaft using all the bolt holes. All the holes were aligned over the crankshaft holes & then bolts tightened down. The dowel holes in the centre were already drilled through so using a slightly smaller drill than the dowel pin size we drill to the required depth. By memory the dowel pins are metric 8mm so I think we used 5/16" or something close. Drilling with a 8mm drill will be to loose a fit.
    We test drilled into a few bits of steel first to get the size right.

    This wont mess with balance.

    The alignment holes on a flexplate & flywheel are in the same locations yes.

    Remember if it is a s/c V6 that the manaul flywheel is going onto then the flywheel needs to be mirror balanced to the s/c V6 flexplate.
    If it is a n/a V6 that the manual flywheel is going onto then the flywheel should be mirror balanced to its flexplate (if it isn't already suited).

    Cheers

    Deek
     
  3. redvsberlina

    redvsberlina New Member

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    Vs v6 project

    I have a s2 ecotec and a t5 gearbox in my garage now i need three things answered before i pull everything apart what flywheel should i buy and is a series one the same as a series two cause they went getrag and dual mass in s2

    marks adapters sell the flywheels to suit which one suits my application ?

    Holden V6 Parts

    and how much is it to get a health check on a gearbox?

    or if anyone has a better sugestion of wer to buy or what flywheel to buy please fire away cause i want to make sure i do this right


    THANKS
     
  4. OZ38

    OZ38 Member

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    Get a Chevtorque flywheel. - 08 94932769
    You will have no problems with that.

    Cheers

    Deek
     
  5. OZ38

    OZ38 Member

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    SORRY for the lack of an answer as I didn't notice your question.

    The manual & auto engine cranks are all externally balanced. So basically the crankshafts alone are the same balance. You should be able to take a flexplate off a n/a auto & bolt on a flywheel from a n/a manual of the same model without affecting the factory balance.

    Different story with a super6 engine as their flexplates are weighted a little different to a n/a engine due to conrod & piston weight differences. So if fitting a manual flywheel it needs to be mirror balanced to the super6 flexplate.

    Cheers

    Deek
     
  6. Pub247

    Pub247 Well-Known Member

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    does anyone know the size of an 8 bolt V6 FLexplate bolt??
    Even just the length of the thread would be fine

    Ckeers Pub
     
  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    i remember it's a fine thread with a shallow head. it's one of the few bolts i buy direct from Holden
     
  8. westerlybreeze

    westerlybreeze Member

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    The 8 bolts for Flexplate/Flywheel to crankshaft are a corse thread ( 5/16" UNC I think) and manual bolts are longer than Autstrumatic bolts.
     
  9. OZ38

    OZ38 Member

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    For the flexplate they are 5/16 UNC (18 TPI) x 5/8" (16mm) long.
    Also the stock GMH ones are a torque to yeild bolt (use them once only).

    Cheers

    Deek
     
  10. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    :bang: sorry mate, i was thinking of the early VN manual flywheel with only 6 bolts

    for future reference they are a 7/16 UNF bolt (20 TPI) x 1" (25mm) with a shallow head
     
    Last edited: Nov 4, 2009
  11. Pub247

    Pub247 Well-Known Member

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    Cheers Guys good ingo to have here any i got flywheel bolts that came witht he motor but i need flexplate ones so length would have been fine but its good to know

    To the bolt shop tomorrow
     
  12. VNracer34G

    VNracer34G Member

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    which is same as chev/ford small block, i got a set of ARP ones dirt cheap cos they make such high volumes of the part # 100-2801 for the set of 6
     
    Last edited: Dec 16, 2009
  13. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    good info, picked up a set today for about NZ$15
     
  14. tj24fmx

    tj24fmx New Member

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    help please



    i have a vn s1 auto that im converting to a vn s1 manual, just wondering if i use the crank adaptor from crs for the 6 bolt fly wheel do i need to get it balanced? and by balancing do you mean the whole engine and flywheel of just the fly wheel. another thing if like you said the s1 6 bolt flywheels are bias balanced, meaning unbalanced how do you balance them?
    one last thing is it possible to get the flywheel machined to reduce the weight of it to increase how quickly the car revs?
     
  15. neet_wagon

    neet_wagon New Member

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    I have one such crank adaptor..... not a crappy CRS one though.












    Seen it in a sig around here somewhere.........................
     
  16. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    you would need to balance the entire rotating assembly because the buick is externally balanced. so that means crank + flywheel (and clutch pressure plate) + harmonic balancer.

    yes, you can machine the flywheel to reduce weight. however, the weight in the flywheel helps to smooth out the engine so you don't want to go to light.

    you could balance the flywheel by itself if you knew the exact weight to offset the bias weight already in the flywheel but it would be pointless as you need to balance the entire rotating assembly. the only time you would want to do this was if you were fitting a new pressure plate and wanted to maintain the balance from the old pressure plate. don't know anybody that does that though
     
  17. tj24fmx

    tj24fmx New Member

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    o.k so to balance the entire rotating assembly would i be able to do this myself or would any descent mechanic be able to do it? can you balance it with the engine still in the car?
    also how do they externally balance the entire rotating assembly?
    is it costly and is it done without pulling the engine to pieces?
    thank you for your help immortality.
     
  18. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    you need to remove the rotating assembly to balance it and it needs to be done by a machine shop with the right equipment. you can do some balance work at home with regards to weight of the indervidual parts like pistons and rods (match weight balance) however some know-how and equipment required like digital scales and balance rig for the rods.

    a internally balance rotating assembly use neutral balance flywheel and balancer. for a externally balanced assembly there are extra weights on the harmonic balancer and/or flywheel. to check and alter the rotating assembly, they spin the crank up on a special rig with weights bolted on the big ends to simulate the rods/pistons. they then drill the counter weights to remove weight or add some heavy metal to increase the weight. a heavy metal balance job is expensive but would only be required if extremely heavy duty pistons/rods are used that are really heavy.
     
  19. 4bait

    4bait Member

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    Does anyone know the flywheel part numbers or how are they identifiable vissually?

    I am putting an Ecotec into a boat and have purchased a series 2, 8 bolt flywheel but do not know if it is Vr series 2 or VS series 2 etc.

    how can you tell the difference by looking at them?

    I don't really want to fit the whole thing in and find out that the boat vibrates like crazy

    My flywheel part number is 92061852 if that helps

    Cheers Andy
     
  20. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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