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  • Affect of nitrous to compression ratio?

    I know that nitrous effectively raises the compression ratio of the engine its used on but is there a formula to figure out what the compression ratio would be changed to per a given shot of spray?

  • #2
    how does N2O raise the CR ? it dosent change the bore, the stroke, head volume....
    -Aaron, AKA ATL2001<br />93 3.4L <br /><a href=\"http://www.ilfba.com\" target=\"_blank\">www.ilfba.com</a>

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    • #3
      i dont think it raises compresion. you want to lower the compression if your doing a big shot to avoid detonation.
      2002 NBM Pontiac Firebird Formula<br />Mods: stock...<br />1997 Chevy Camaro *Gone*<br />Mods:Borla,headers,Magnaflow cat, SLP intake, NOS 5175

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      • #4
        There's static compression and dynamic compression. It wouldn't change the static compression. Because of the cooling effect on the intake charge (making it more dense), it might be considered to change the dynamic compression. I don't know of a formula for it.

        It will definitely increase the cylinder pressure.
        \'98 A4 Camaro v6-&gt;v8 conversion, and STS kit next<br />v6: 13.6 Powerdyne, 13.2 150 shot, 13.8 120 shot, 14.3 85 shot, 15.7 stock<br />v8(na): 12.18@113, 392rwhp<br />Moderator on <a href=\"http://www.mtfba.org\" target=\"_blank\">www.mtfba.org</a> and <a href=\"http://www.frrax.com\" target=\"_blank\">www.frrax.com</a> (Road Race & Autocross)<br /><a href=\"http://community.webshots.com/user/johnduncan10\" target=\"_blank\">Car pics</a>, <a href=\"http://www.trscca.com\" target=\"_blank\">TN Region SCCA</a>

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        • #5
          I know there is a formula for this. Anyone else know?

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          • #6
            You are thinking of cylinder pressure, not CR.

            And yes, nitrous send your cylinder pressure through the freakin' roof.
            1999 red camaro v6 M5: with a turbo<br />13.52@107.99<br />No, seriously: Who Farted? <br /><a href=\"http://www.cardomain.com/memberpage/600086\" target=\"_blank\">http://www.cardomain.com/memberpage/600086</a>

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            • #7
              Originally posted by malice10985:
              You are thinking of cylinder pressure, not CR.

              And yes, nitrous send your cylinder pressure through the freakin' roof.
              Actually, I am thinking about cylinder pressure and the dynamic compression ratio. Since the nitrous is sooo cold, it make the air more denser thereby increasing the dynamic compression ratio.

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              • #8
                I've heard.... from nitrous guys at the track.... it makes the car act like a much higher compression car.

                I heard rumors.... 20 to 1+

                No proof though

                Not aware of any formula either
                Race car - gone but not forgotten - 1997 firebird V6
                nitrous et & mph: 12.168 & 110.95 mph, n/a 13.746 & 96.38 mph
                2013 Dodge Challenger SRT8: 12.125, 116.45
                2010 Ford Taurus SHO: no times yet

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