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Thread: 83mm Pistons in a JDM B20A Block

  1. #1
    LX User fmn716's Avatar
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    83mm Pistons in a JDM B20A Block

    HI Guys

    searched around for this but I couldnt find any answers so maybe you can help

    found this thread but the answer is not there

    https://www.3geez.com/forum/jdm-b18a-b20a-swap-tech/64992-engine-biuld-designs-who-do.html


    Anyway so I know a few ppl on pp.com are running b21 (83mm pistons) in there 3G lude b20a's

    Now I would like to know can I bore out my block to 83mm and still run high comp pistons or will the block walls become to weak ?

    Thanks for any input



  2. #2
    3Geez Veteran MessyHonda's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    hey nice to see you here. I had my b20 bored out to 81.5. its much easier to run b16 pistons

    1989 Honda Accord LX-i
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  3. #3
    LX User fmn716's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    haha still need to pay the balance on the intake manifold pm me how much I owe you again
    been a while and I totally forgot about it lol

    The reason I am looking at boring it out to 83mm is that I can get CA18 pistons for a good price

    The only thing I am worried about is weakening the block to the point of failure

  4. #4
    3Geez Veteran gfrg88's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    Why not run b16 pistons instead? You can find them cheap too
    -Gio
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  5. #5
    LX User fmn716's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    I have had a look at the rs machine pistons but those only go to 82mm and then jump to 84mm

  6. #6
    3Geez Veteran gfrg88's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    why not 82mm? And there's some 83mm out there also..
    -Gio
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  7. #7
    LX User fmn716's Avatar
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    Re: 83mm Pistons in a JDM B20A Block

    I am kinda keen on those pistons as they per the price

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