[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Re: Agreed... Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by John Williams [Email] (#1982) [Profile/Gallery] (more from John Williams) on Wed, 31 Jan 2007 12:23:24 In Reply to: Agreed..., Chad, Wed, 31 Jan 2007 11:53:56 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

Most of that is from my 2 stroke knowlege and I do know 4 stroke motors do not respond nearly as well to a tuned pipe or header. I guess the turbo adds a whole new set of factors to consider, but I still bet there is an optimum length for top end power and an optimum length for low end torque and this is another reason some header manifolds are so expensive. If you have made a whole bunch of headers and actually know which length is ideal for our engines, well that would be an important little piece of data to have.

Just like if you had a flow bench and a bunch of heads to port/polish. Somewhere in there is the perfect amount or size of the ports and bowls that gives the maximum flow without robbing too much low end power and drivability and knowing just how much to open them up and in what shape and how smooth would all be helpfull information. If you go too far on the ports, you may get good top end, but you might hurt the low end torque. Same idea I think.
Knowlege is power!
John

posted by 75.71.190...

• Performance with muffler/ without!!!!!!!, Aerohead , Tue, 30 Jan 2007 14:34:02
  • Re: Performance with muffler/ without revealed..., matsuda, Thu, 8 Feb 2007 17:08:15
  • Re: Performance with muffler/ without!!!!!!!, SWEDISH DYNAMICS, Tue, 30 Jan 2007 15:37:32
    • Velocity and Scavenging...myth?, Chad, Wed, 31 Jan 2007 06:41:03
      • Scavenging is for increasing the VE of N/A engines..., Jonathan Scupin , Thu, 1 Feb 2007 20:02:39
        • Re: Scavenging is for increasing the VE of N/A engines..., Aerohead , Fri, 2 Feb 2007 16:00:05
        • Yea, but the engines are na until the turbo spools!, John Williams , Fri, 2 Feb 2007 12:00:27
          • they're really not, TML , Sun, 4 Feb 2007 13:50:18
          • Re: Yea, but the engines are na until the turbo spools!, Chad, Fri, 2 Feb 2007 12:27:43
          • good point, John!, Jonathan Scupin , Fri, 2 Feb 2007 12:18:40
        • Re: Scavenging is for increasing the VE of N/A engines..., Chad, Fri, 2 Feb 2007 07:23:52
          • Re: Scavenging is for increasing the VE of N/A engines., Jonathan Scupin , Fri, 2 Feb 2007 07:44:17
            • Re: Scavenging is for increasing the VE of N/A engines., Chad, Fri, 2 Feb 2007 08:43:44
      • Heady stuff, turbocon86, Wed, 31 Jan 2007 08:41:45
        • I cannot fathom how exhaust flow can cause vacuum..., Chaz, Wed, 31 Jan 2007 10:49:52
          • Re: I cannot fathom how exhaust flow can cause vacuum..., John Williams , Wed, 31 Jan 2007 11:46:12
            • Agreed..., Chad, Wed, 31 Jan 2007 11:53:56
              • Re: Agreed..., Aerohead , Wed, 31 Jan 2007 12:36:21
              • Re: Agreed..., John Williams , Wed, 31 Jan 2007 12:23:24 <-- Viewing This Message
                • A bit of physics involved, turbocon86, Thu, 1 Feb 2007 13:31:54
                • 2 Strokes are radically different..., Chaz, Wed, 31 Jan 2007 16:32:21
                  • Re: 2 Strokes are radically different..., John Williams , Wed, 31 Jan 2007 17:23:55
                  • Re: 2 Strokes are radically different..., lms, Wed, 31 Jan 2007 16:59:41
                    • 2-stoke tuning, paul o., Wed, 31 Jan 2007 18:35:12
                      • Re: 2-stoke tuning, John Williams , Wed, 31 Jan 2007 19:47:44
                        • 2-stroke tuning compared to my SPG, dannyboy, Wed, 31 Jan 2007 23:00:40
                          • Re: 2-stroke tuning, paul o., Thu, 1 Feb 2007 11:19:28
                            • That is a great diagram!!!, John Williams , Thu, 1 Feb 2007 13:01:29
                          • Re: 2-stroke tuning compared to my SPG, Chad, Thu, 1 Feb 2007 09:34:54
                            • Re: 2-stroke tuning compared to my SPG, John Williams , Thu, 1 Feb 2007 10:08:02
                          • Re: 2-stroke tuning compared to my SPG, John Williams , Thu, 1 Feb 2007 08:53:29

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