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Factory Flow Rate for S13 Cylinder Head?

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  • Factory Flow Rate for S13 Cylinder Head?

    Anyone know the intake and exhaust port flow rate for a factory S13 cylinder head?

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

  • #2
    Nevermind, Alex sent me a couple links. Looks like around 204 CFM on the intake and 115 CFM on the exhaust side for a factory high port SR head...

    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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    • #3
      Ok, I'm not so sure on that exhaust port flow rate, seems a little low after getting my numbers back, lol.

      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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      • #4
        I've typically seen them in the low 200's on intake and low 100's on exhaust.
        VVL S14 on KW's...

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        • #5
          Interesting. Well I got some numbers back on my highport cylinder head (oversized valves and ported). I got 240CFM @ .5" lift on the intake and 184CFM @ .5" lift on the exhaust. Little more than a stock VE on the exhaust side and a little less on the intake side. Both heads tested on the same machine; I'll have pretty exact numbers later tonight.

          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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          • #6
            I wouldn't just look at peak numbers. The valve spends very little time there. Integrate the area under the curve for a given cam profile.
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            • #7
              I definitely am not. I have both curves, and will be posting a comparison chart tonight when I get it together. I think it'll help out the comparison discussion a bit. I know the VE head is better, but It would have cost me a LOT more money to go that route than just stay with the DE head. If I didn't already have a bunch of head parts already, the cost is about the same, but I already had the extra parts on the DE head.

              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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              • #8
                Here is what my completely stock VE head flowed;

                Intake
                Lift CFM
                .050-49
                .100-86.2
                .150-122.6
                .200-158.6
                .250-192.5
                .300-225
                .350-249.2
                .400-263.5
                .450-272.9

                Exhaust

                Lift CFM
                .050-46.5
                .100-86
                .150-118.5
                .200-147
                .250-171
                .300-183.5
                .350-188.8
                .400-193
                .450-196
                VVL S14 on KW's...

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                • #9
                  Originally posted by jr_ss View Post
                  Here is what my completely stock VE head flowed;

                  Intake
                  Lift CFM
                  .050-49
                  .100-86.2
                  .150-122.6
                  .200-158.6
                  .250-192.5
                  .300-225
                  .350-249.2
                  .400-263.5
                  .450-272.9

                  Exhaust

                  Lift CFM
                  .050-46.5
                  .100-86
                  .150-118.5
                  .200-147
                  .250-171
                  .300-183.5
                  .350-188.8
                  .400-193
                  .450-196
                  Which is fairly close to the chart that I have, but the exhaust port wasn't as good. It was done by the same machine at the same company, so I think the results are comparable. Some pretty good numbers for sure though, lol. I'm not saying the DE head is better or even "as good" (because it isn't, lol), I just wanted to compare.

                  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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                  • #10
                    Posted the comparison in my build thread:

                    http://nissanroadracing.com/showthre...t=2222&page=14

                    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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                    • #11
                      From my understanding and research, the best way to have the head flow benched is to have the intake and exhaust manifolds bolted up, to give you a "true" reading. I didn't have mine done that way. In the future I plan on having my or another head ported for max flow. I'd just like to finish my build currently and get it running/driveable, it's been down for almost 3years now.
                      VVL S14 on KW's...

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                      • #12
                        Originally posted by jr_ss View Post
                        it's been down for almost 3years now.

                        I hear you on that one... lol

                        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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                        • #13
                          This is flow bench test I did a few years ago.

                          FWD SR20DE high port head ported on intake and exhaust.
                          -stock valves
                          -3 angle valve job done in a Serdi
                          -replaced guides
                          -all test performed on a SuperFlow 600 bench at 28" water using Audie Technology Digital inteface with a Mitutoyo stepper motor, aka put in desired lifts in program and it runs/records all data on its own.



                          For some reason I cannot locate the file/data testing the exhaust ports

                          SR20VE is definitely the way to go. I just bought a complete head with manifolds for $250. I will need to get it set up sooner or later.

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                          • #14
                            Taken from my build thread I linked earlier:

                            They also bench tested my cylinder head. I honestly forgot to have them flow test it as stock, so I'm pretty bummed about not having stock numbers to compare it to, but I do have numbers (from them) from when they tested a stock SR20VE cylinder head. I know the SR20VE head is much better than the standard highport DET head (especially after some work), but I just couldn't afford to make the swap. However, I'm fairly happy with the results I got back from the DET head. Looks like the exhaust side flows a tad better than a stock VE head now, but still lacking a little up top for the intake side. I'm OK with that though. I know other people have gotten different numbers for both heads, but I figured since these were both tested by the same company on the same equipment, that it would be a reasonable comparison. Here's a little chart I put together comparing the two:


                            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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                            • #15
                              Based on the information in both your's and Pavel's posts, it's safe to say anything over .450"/11.5mm of lift is pointless and doesn't net any real additional flow on the DE/T head. I understand it still increases, but it's marginal at best.

                              With that said, I wonder why Tomei, HKS, etc have cams with 12+mm of lift, when it doesn't exactly produce any positive results? Possibly to take full advantage and cram as much air in as possible? I know there is more to cam design than peak lift, such as ramp up profiles, duration, etc. I wish more information on cam design for the SR was available.
                              VVL S14 on KW's...

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