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  1. #1
    MoreNuttyThanASquirlTurd
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    Join Date: Dec 2007
    Location: Madison, WI
    Posts: 3,006
    Feedback Score: 48 (100%)

    Default Let's talk headers

    I am in the process of building a new header and would like to go over a few figures. I have purchased the PipeMax software to help me go over some figures and make some calculations. I am in the process of modeling my header to see where I am starting from. My dyno graph shows my max HP at around 7400 RPM, if I enter this into the calculator, the overall length of the header should be 28-30 inches long at 1.75-1.875" diameter. The Mazworx header I am using now, is 37" long and 1.75" in diameter.

    In order to get the program to calculate a header that length, the peak HP has to be set to 6000 RPM. So the calculated peak HP and realistic HP difference is 1400 RPM. Now the question is, does this scale up? I know this program does not take the intake plenum and other parts of the motor into consideration when calculating these numbers.

    I am trying to build a header with a peak around 8000 RPM, using the calculator, I get a header at 25-28 inches long.

    Anyone have any insight on this? I know a lot of the high HP headers are in the 23" range, so maybe the data is not that far off. I am just a little confused on the results of my current header.
    92 Infiniti G21 - 242 WHP & 182 Ft-LBs (Mustang Dyno) - NA 88mm 12.5:1 VE, N1 cams, Xcessive Intake, Q45 TB, Mazworx Header, 3" Exhaust, Nismotronic ECU on MAP and IAT.
    View The Build Here

  2. #2
    OEM Plus.
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    Join Date: Dec 2007
    Posts: 11,172
    Feedback Score: 52 (100%)

    Default

    Send in that stuff to Burns Stainless (newest link I could find, used to be different than I see the current scheme presented at this new hyperlink) and they are supposed to give out free quotes... maybe that is the days of past. That is how we got the infamous Kojima header (for DE).

  3. #3
    MoreNuttyThanASquirlTurd
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    Join Date: Dec 2007
    Location: Madison, WI
    Posts: 3,006
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    Default

    I have been doing some research and calculations to try and decide on some specs. Charles sent me a good bit of info as well that influenced a last minute change. I now have a plan for a header, just need to order parts and build it. Hoping for the weekend of June 3rd to build it. I purchased the PipeMax software, it is pretty good but needs some interpretation but it does a lot of the math for you. I also purchased a book that goes into some detail as well, Engine Math Book.

    I will post results and specs to share what I have learned. I am hoping to do some more reading to better understand what is happening and why.
    92 Infiniti G21 - 242 WHP & 182 Ft-LBs (Mustang Dyno) - NA 88mm 12.5:1 VE, N1 cams, Xcessive Intake, Q45 TB, Mazworx Header, 3" Exhaust, Nismotronic ECU on MAP and IAT.
    View The Build Here

  4. #4
    OEM Plus.
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    Join Date: Dec 2007
    Posts: 11,172
    Feedback Score: 52 (100%)

    Default

    Sooo forget Burns for specs?

  5. #5
    MoreNuttyThanASquirlTurd
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    Join Date: Dec 2007
    Location: Madison, WI
    Posts: 3,006
    Feedback Score: 48 (100%)

    Default

    I think with Burns you have to purchase one of their collectors to get their specs. All of the parts should be here soon, not sure when I will have time, I have finals in a few weeks, so probably after that.
    92 Infiniti G21 - 242 WHP & 182 Ft-LBs (Mustang Dyno) - NA 88mm 12.5:1 VE, N1 cams, Xcessive Intake, Q45 TB, Mazworx Header, 3" Exhaust, Nismotronic ECU on MAP and IAT.
    View The Build Here

  6. #6
    OEM Plus.
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    Join Date: Dec 2007
    Posts: 11,172
    Feedback Score: 52 (100%)

    Default

    Ahh i see. dang. Good luck with your tests.

  7. #7
    Car at stalemate
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    Join Date: Dec 2007
    Location: Levittown, Pennsylvania, United States
    Posts: 643
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    Default

    if you are intrested you could commission me to 3d print you pieces of plastic with different angles so you can mock up the exhaust without needing to waste metal...



    cket.com/user/enohand/media/exhaust%20Fab/exhaustkit3_zpsxogrn8fz.png.html][/URL]
    Quote Originally Posted by Your Mom
    You are Perfect

 

 

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