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B20 VTEC

Discussion in 'Engine Building' started by Flu_By_U, Nov 20, 2003.

  1. Flu_By_U

    Flu_By_U Junior Member

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    What is the highest compression that I can run, going with a B20 VTEC setup without the everyday use c-16 race gas? I would like to also know what compression would be with a B20 block with a GSR head is?
     
  2. Flu_By_U

    Flu_By_U Junior Member

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    Is the question i asked to hard to answer or do u guys dont know? :hmm:
     
  3. ek9r

    ek9r Senior Member

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    b20b w/gsr head = 9.2:1 CR
    b20z w/gsr head = 10.1:1 CR

    i wouldnt run higher than 12.5:1 on 93 octane unless you run hondata.


    be patient, someone will answer you if you give it more than 3 hours.
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    It's all about the tuning...

    I ran 12.6:1 compression on my B20/VTEC with 93 octane gas and a VAFC for tuning, and it ran just fine for 45k miles. Just make sure you tune well and you'll be fine.
     
  5. Flu_By_U

    Flu_By_U Junior Member

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    how high could the engine rev w/ a mild built head or a fully built head on 12.5:1 compression?
     
  6. 92civicb18b1

    92civicb18b1 The Trisexual

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    I've heard to around 9500+, but even if you could think about it, engines with lower redlines last long, the les u rev it the longer it lasts. I don't think that applies to the break in period.
     
  7. Si950

    Si950 Member

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    12.5:1 with 2.0L displacement is safe with good fuel management and proper tuning. I wouldn't go too much higher than that. Make sure you use 93+ octane all the time.

    As far as rpm, with a stock B20 block, I would stop at 9k. If you went with a sleeved B18 or B20 with good rods and pistons, you shouldn't have any problems almost to 9.5k. If you're going to go that high, though, make sure you have a valvetrain that can hold it without any valve float and cams that have substantial lift/duration in VTEC, or you'll just be beating the engine without any power gains up-top.
     
  8. JDMilan

    JDMilan Senior Member

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    all depends on cam setup, and spring cominations..


    pretty much calesta sumed it up
     
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