LD32 Engine build | Page 5 | 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.

LD32 Engine build

Discussion in 'Hybrid Z cars' started by jonbills, Apr 5, 2020.

  1. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

  2. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    Having the exact same number of atoms would be hard; they'll be within a gramme or so.
    Taking the edges off, I expect I'll be removing maybe 0.1g. And for comparison, the rods out of my old L24 varied between 735 and 743g. (actually one was 712, but it was a mismatched replacement).
     
    AliK and Mr.G like this.
  3. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    So here’s a challenge: weigh each one before and after, let’s see what the reality of it would be. It would be interesting to know.

    The cylinder walls on Alan’s photo look mighty thin. I’m on the phone so can’t zoom in enough to read the widths + being the wrong side of 25, my eyes are getting worse!
     
  4. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    I'll try to remember when I get them back.
    I can't read them, but I expect the calipers say 3.5mm.
     
    AliK likes this.
  5. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    I reckon 2.25mm :conf2:
     
    AliK likes this.
  6. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    96 - (2 *(92.5/2)) = 3.5 was my calculation.
    how does yours go Rob?
     
    AliK likes this.
  7. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    I tried to read the gauge. EXTRA:D
     
    AliK and jonbills like this.
  8. Mark N

    Mark N
    Z Club Member

    If I remember correctly, the Wiseco pistons I used in my RB had about a 0.2g variation straight of the box.
    The Manley rods started with about 6g difference but the ends were all over the place.
    It took quite a bit of work on the belt sander to match all the big ends and all the small ends.
    I ended up with each assembly (piston, pin and rod) within 0.4g of each other, at which point I figured that was more than good enough for my application.
     
    Mr.G, AliK and jonbills like this.
  9. Albrecht

    Albrecht Well-Known Forum User

    The article mentions offset-boring some of the cylinders to mitigate differences in support for the liners in each 'hole'. There's differing amounts of metal left in each cylinder after boring, so they shuffled them about a little to suit. Therefore I'd expect different measurements for the gap between each bore. Not much left for the head gasket to sit on...!

    I've seen this offset cylinder bore shuffling done on other types of engines too.
     
    AliK likes this.
  10. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    Yeh I think it's done on Minis to get 1340cc.

    What did the gauge read Alan?
     
  11. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    So, coming from a point of utter ignorance on this topic: how does that work with the crank? Are they also using an offset crank of sorts?
     
  12. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    I think the offset is across the block not down it. Might be wrong?
     
  13. Albrecht

    Albrecht Well-Known Forum User

    No. This is about shuffling bore centres along the centre line of the crankshaft, and the small differences are mitigated by the connecting rods finding their own centres on the crank pins. There's enough clearance between pistons and piston pins, and conrods and crank pins, to allow this.

    Don't know. Can't see the scale!
     
    AliK and atomman like this.
  14. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Thanks for that - makes sense.


    Wrong side of 25 brah!
     

Share This Page