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Thread: Balancing pistons and pins - together or separate?

  1. #1
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    Balancing pistons and pins - together or separate?

    Hello,
    I've been reading up on how to (and how not to) balance pistons. Is it necessary to balance pistons and pins individually or can they be weighed together? Sort of like:

    Piston 1 330g, gudgeon pin 1 80g = 410g total
    Piston 2 340g, gudgeon pin 2 70g = 410g total
    Piston 3 325g, gudgeon pin 3 85g = 410g total
    Piston 4 335g, gudgeon pin 4 75g = 410g total

    Or do all pins have to weigh the same and all pistons have to weigh the same?Thanks
    Mik
    Last edited by uber-tub; 16-10-19 at 18:12. Reason: poor spelling
    1974 Golf 2.0, Petrol ABF

  2. #2
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    As long as you keep them together ,keeping 410gms , that's fine...

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  3. #3
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    Thank you John. That makes sense.
    Mik
    1974 Golf 2.0, Petrol ABF

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    Are you going to do the con-rods also?

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  5. #5
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    Hi John,
    I'm buying aftermarket pistons but using the stock ABF rods. I'll check the weights but thought these would be balanced well from factory - or is that naive? Cheers
    1974 Golf 2.0, Petrol ABF

  6. #6
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    Might be worth checking big ends/small ends and overall weights...as you have a gram scale..

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  7. #7
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    Will do John. I'm new to all this so any advice is gratefully received.
    Cheers
    1974 Golf 2.0, Petrol ABF

  8. #8
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    I did all this on my Lotus Twincam engine , it was a smooth engine afterwards , but wether it was worth all the time and effort for the end result , I'm not sure , but I did enjoy the experience...

    Go for it..

    John
    2005 Polo 9N3 1.4S 16v, Petrol, BKY engine, GRZ gearbox, 5 Speed

  9. #9
    Administrator Keithuk's Avatar
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    They are better of being weighed together as you normally remove excess weight from the piston skirt as it isn't easy to grind the gudgeon pins.

    I've done that on a Suzuki GS750 I used to have when I fitted a Yoshimura 850 kit.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


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    Thanks Keith. I've ordered JE +0.5 full round skirt so should be okay to lighten. I presume rings weight varies so little I don't need to worry about them?

    Just a quick note on the crank. I was planning to get the diesel 95.5 crank lightened to the same as the existing petrol ABF crank, but would i need to lighten the counter-weights to match the new, lighter pistons - by the difference in weight between the old and new pistons?
    Thanks

    I've just moved this comment to another thread as it's a bit different from the title. Cheers
    Last edited by uber-tub; 17-10-19 at 17:48. Reason: change in topic
    1974 Golf 2.0, Petrol ABF

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