offset crank griding and rod bearings | The Z Club of Great Britain
  1. The Z Club relies on the support of it's paid members - join the club or renew your membership here.

offset crank griding and rod bearings

Discussion in 'General discussion' started by franky, Aug 16, 2018.

  1. franky

    franky
    Z Club Member

    Hi

    can anyone say what the max offset you can grind a 240/280 crank is, while using off the shelf rods?

    If you had a 1mm offset grid, is that the 0.5mm oversized rod bearings.... thats the way i'm looking at it?

    Never looked at offset stuff before!
     
  2. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

    Yes I think that's right. The oversize bearings are measured relative to radius of the journal.
     
    franky likes this.
  3. franky

    franky
    Z Club Member

    good. I'm not going bonkers!
     
  4. franky

    franky
    Z Club Member

    Max bearing i've seen is 0.5mm?
     
  5. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

    Can't guarantee that.
     
  6. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

    I've seen 0.75 I think. I'll have a look...
     
  7. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

  8. franky

    franky
    Z Club Member

  9. Turn & Burn

    Turn & Burn
    Z Club Member

    Interested to see how this goes, I’ve got an LD crank that would be good to offset grind.
     
  10. franky

    franky
    Z Club Member

    its very common, you've just got to make sure you get bearings to fit the offset..... also if you offset an ld what rods would you run?

    I did have a cheap as chips ld engine at £230 ish for the whole thing..... I've since found a couple more but don't really want the large displacement/torque.
     
  11. Turn & Burn

    Turn & Burn
    Z Club Member

    I’ll prob end up with MaxSpeeding rods on 88mm JE pistons. If I could have gone for a big offset grind I would have perhaps gone for it, but 1mm offset only gains 30cc. I was concerned about needing to re heat treat the crank also.
     

Share This Page