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Big Bore Barrels and Pistons - 1.8 litre to 1911cc

Discussion in 'Engine & Transmission' started by Ian and Shelley, Jan 7, 2020.

  1. Ian and Shelley

    Ian and Shelley Active Member

    Messages:
    230
    Location:
    Umina Beach
    Hello

    Does anyone have experience or knowledge of fitting a big bore barrels and pistons to an 1800 cc motor.. the below blurb sounds easy and no issues IS THIS TRUE??
    ALSO : Is this a waste of time and money? Leave as 1800 and enjoy ?

    https://au.vwheritage.com/ac198970-barrel-pistons-96x66-1911cc-for-17-18litre-type4-vw-spare

    96mm big bore barrel and piston kit designed for use with a 1.7 or 1.8 litre Type 4 engine with a 66mm standard stroke crankshaft. Increases the displacement to 1911cc. Pistons are a flat top slipper skirt design. No machine work is needed on the 1.8. The kit includes barrels, pistons, rings, gudgeon pins and clips.

    Thanks

    Ian
     
    Last edited: Jan 7, 2020
  2. tintop

    tintop Well-Known Member

    Messages:
    612
    Location:
    Canberra
    Hi Ian, might run a bit hotter (assume the cylinder walls are thinner). Compression ratio will increase. Carbies may need to be re-jetted/adjusted. Everything can be sorted. Patrick
     
  3. Barry

    Barry Well-Known Member

    Messages:
    4,175
    Location:
    Abbotsford NSW
    “Head needs to be machined to 105mm diameter”

    Is this standard for an 1800 head opening?

    Only applies to 1700 heads?



    “IF” your bus is pulling a heavy load then “slip in” pistons can distort to increased temperatures as Patrick mentioned.

    It was a problem in Type 1 motor where you could go up 2 sizes from stock
    1584 stock - 85.5’s
    1641 - 87’s
    1679 - 88’s

    The 88’s in a bus did cause blow by from over heating.

    That all said I have not heard of issues of people using the 96’s
     
  4. oldman

    oldman Super Moderator Staff Member

    Messages:
    8,899
    Location:
    Avalon Beach NSW
    All that said, there is nothing you can just “bolt on” and increase performance.
    A VW engine relies on everything being balanced and matched, to perform efficiently.
    Good luck which ever way you go.......
    Cheers,
    Mark
     
  5. tillis

    tillis Well-Known Member

    Messages:
    281
    Location:
    gold coast
  6. tillis

    tillis Well-Known Member

    Messages:
    281
    Location:
    gold coast
  7. tintop

    tintop Well-Known Member

    Messages:
    612
    Location:
    Canberra
  8. tillis

    tillis Well-Known Member

    Messages:
    281
    Location:
    gold coast
    search that site and you will find what you want...if you want...my point as Mark said is bigger bore without anything else is retrograde
     
  9. grumble

    grumble Well-Known Member

    Messages:
    1,086
    Location:
    Taree
    I have a set of O/S pistons & barrells that I changed out of a motor, not sure how many km's they have done, the cam was a regrind that the lobes weren't hardened and wore the exhaust lobe down. I rebuilt the motor & changed fitted new barrels & pistons along with the cam, followers etc. I can check the size if you are interested.
     
    bern likes this.
  10. DakDak67

    DakDak67 Well-Known Member

    Messages:
    441
    Location:
    Brisbane
    For money spent the power increase won’t be worth it . I’d spend the money on craft beer and King Island cheese.
     
    grumble, bern, Grantus and 4 others like this.

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