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Factory Flow Rate for S13 Cylinder Head?

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  • #16
    The longer you spend at that lift or above, the more total flow. So to hit those flow numbers for more than a nanosecond, you have to go beyond it with cam lift then come back down.


    Interesting comparison tho. Any details on what was ported? Seems like its really all in the valve job and the throats of the valves. Then it's just little clean up which doesn't help overall flow much.
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    • #17
      Probably why most cams only go to 12mm (472"). That's what mine do, lol. There are a few cams (tomei procams in 270 and 280 to name a couple) that go to 12.5mm (0.492"), but not many go over that. Looks like the VE head will have more of a gain above .5"; curious to how much though.

      I'm actually fairly content with the numbers I got from the ported DE head. If I ever want more (for whatever reason), I'll have to save my pennies for awhile to go VE, ha ha.

      www.2LiterTurbo.com (Personal Site)
      96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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      • #18
        I'll have to post up better pics when I get the head, but from what I was told (and initially asked for), they just blended the back of the seats into the head, deshrouded the valves a little in the combustion chamber and cleaned up the surface a little in the ports. They also polished the combustion chamber a little. This is all other than the standard valve job. It was what they called a "pocket port" job, lol. I didn't want to spend a **** ton of money on it, because I knew it was just a DET head and really just wanted to get my motor back up and running.

        www.2LiterTurbo.com (Personal Site)
        96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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        • #19
          Sorry. Is there flow rate data for the KA as well?

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          • #20
            I don't have any, but I'm sure someone has posted it somewhere.

            www.2LiterTurbo.com (Personal Site)
            96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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            • #21
              Information I got a LONG time ago:

              Originally posted by Stock Flow Numbers @ 28"
              Valve Lift / CFM

              Intake:
              .100" = 99.3
              .200" = 171.1
              .300" = 223.4
              .400" = 241.8
              .500" = 243.6
              Exhaust:
              .100" = 75.8
              .200" = 144.5
              .300" = 173.9
              .400" = 182.9
              .500" = 183.6
              Originally posted by Valve Info
              Intake -
              Valve Diameter: 36.6mm
              Valve Stem Diameter: 6.97mm
              Valve Length: 101.32mm

              Exhaust -
              Valve Diameter: 31.3mm
              Valve Stem Diameter: 6.94mm
              Valve Length: 99mm
              Originally posted by Cervasa
              1mm Oversized Valves I & E
              PnP
              Valve Lift / CFM

              Intake:
              .100" = 122
              .200" = 228
              .300" = 316
              .400" = 332
              .500" = 379
              Exhaust:
              .100" = 106
              .200" = 193
              .300" = 253
              .400" = 278
              .500" = 281
              Originally posted by 96nismo240sx - KA-T.org
              PnP
              Valve Lift / CFM

              Intake:
              .050" = 88
              .100" = 131
              .150" = 170
              .200" = 207
              .250" = 236
              .300" = 257
              .350" = 275
              .400" = 281
              .450" = 285
              Exhaust:
              .050" = 51
              .100" = 85
              .150" = 119
              .200" = 150
              .250" = 178
              .300" = 200
              .350" = 203
              .400" = 208
              .450" = 203
              Head done by cervasa was sent to Cosworth for major work over. Hence the high flow numbers.

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              • #22
                Those are some pretty impressive numbers. Never knew how the KA heads flowed.

                www.2LiterTurbo.com (Personal Site)
                96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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                • #23
                  Despite low power numbers I believe it was one of Nissan's better flowing heads.

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