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Over bore my pistons

Discussion in 'General Tech and Maintenance' started by mozzandherb, Dec 2, 2005.

  1. mozzandherb

    mozzandherb Senior Member

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    I'm looking into buying some Mahle pistons 9.1 with 87mm bore for my H22 (that's what the stock bore is), but I've been reading some other threads and people are buying these pistons with a .25mm over bore just to be safe in case there cylinders wall are a little messed up. Now I bought this motor used and I haven't seen the cylinder walls and I no expert when it comes to this, but I'm wondering IF I buy these pistons would it be wise to oreder the over bore 87.25mm or should I stick with the 87mm? Or is there a way to tell what size I should be using? I guess there is right, but that would involve measuring the cylinder walls. What woudl you guys suggest 87 or 87.25 to be safe?
     
  2. formby

    formby learning in progress

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    i would keep it 87 unless you NEED to over bore..... the machine shop knows....
     
  3. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    Cant overbore an H22
     
  4. mozzandherb

    mozzandherb Senior Member

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    I don't mean the FRM sleeves I'm just thinking about the pistons.
     
  5. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    i know what you meant. my comment was directed to formby.
     
  6. mozzandherb

    mozzandherb Senior Member

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    So what do you think would be the best thing to do? Get it measured? And man I don't know what you think but fuck homemadeturbo site, all they do is bash eachother...no help at all.
     
  7. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    yeah...thats what it seems like to me too.

    Yeah, get the cylinders checked. you shouldnt have much of a problem staying with 87 though.
     
  8. mozzandherb

    mozzandherb Senior Member

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    If I do go with a turbo is there anything I might have to worry about with my tranny?
     
  9. reikoshea

    reikoshea HS Troll...And Mod Moderator VIP

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    just your clutch...youll have to get one that will support your new horsepower or your engine will probably just rev out of gear.
     
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