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How big can i bored

Discussion in 'Engine Building' started by civic707, Oct 13, 2004.

  1. civic707

    civic707 Junior Member

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    i have a gsr and i am thinking of bigger piston.
    How big do u think i should overbored without changing the sleeves and how much compression
     
  2. 97CTR

    97CTR Senior Member

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    82mm is max bore on stock sleeves, 81.5 is safer.
     
  3. 92civicb18b1

    92civicb18b1 The Trisexual

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    You can[b/] bore to 84 mm but the sleeves are gonna be pretty damn thin, I would reccomend about 82mm like 97CTR said.

    It also depends on what you're doing, if it's going to be a relatively stock motor where you're not beating on it all the time, 84 is reasonable and will work fine. If your going FI, I wouldn't go over 82 on stock sleeves.

    It's early and if I said something stupid and wrong just ignore it.
     
  4. JDMilan

    JDMilan Senior Member

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    I would go 81.5......seen some good graphs with 81.5mm
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    I wouldn't bore an 81mm block to 84mm unless you just plan on using it as a wall decoration.
     
  6. sohcbuilder

    sohcbuilder Member

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    werd ... depends on what your setup is compression, depends wether your going na boosted or nitrous ....... as far as bore'n it if your going turbo you might as well bore and sleeve it if your going all motor id bore it 81 and be safe
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    That would be called not boring the block at all. :lol:
     
  8. civicious

    civicious FüK-VTEC VIP

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    sleeve that bitch. 85mm.
     
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