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85mm block

Discussion in 'Engine Building' started by twotwo, Nov 5, 2003.

  1. twotwo

    twotwo Senior Member

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    Hello guys im in the process of gettting my motor rebuilt and have a few questions...i have an 1.8 GSR block that will be going under surgery getting resleeved and the works.....so my question is will i be safe to run an 85mm bore??....also what at kind of compression can i be running with 91 or 93 pumped gas???....im going N/A daily driven but want the most power without sacrificing reliabilty......any input would be great.....thank you and have a nice day!!!
     
  2. pissedoffsol

    pissedoffsol RETIRED

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    85mm sleeved is ok for all motor. piston choice gets a little more limited though, so keep that in mind.

    91 vs 93 is a big difference IMO. can you ALWAYS get 93 octane?
    i wouldn't go more than 11:1 on 91, but on 93, i'd say mid 12's:1 would be fine....
     
  3. twotwo

    twotwo Senior Member

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    93 is no problem....so your saying im in the clear with running 85mm bore and around 12:1 compression??....thank you and have a nice day!!!
     
  4. JDMilan

    JDMilan Senior Member

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    I would go with 84, if anything should go wrong you can bore it out larger to fit a little bit larger piston, if you ran the 85mm then like B said the choices get scarce
     
  5. liquid00meth

    liquid00meth Senior Member

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    :iconcur: Go with the 84 to begin with, that way if something goes wrong your not maxed out. You still have 84.5 and 85 to go.
     
  6. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Nah, I'm running 85mm and I still have 85.5mm, 86mm, 86.5mm, and 87mm to go. Plenty of room for rebuilds.

    :lol:
     
  7. ek9r

    ek9r Senior Member

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    :owned: :p
     
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