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  1. #1
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    Lightbulb AIRFLOW work (Intake Manifold w/ IC's)

    Time for more AIRFLOW work…

    *** The below information is stated as INFO ONLY. The data collected can be used to help justify typical modifications done to a 4TEC motor. These numbers are for AIRFLOW ONLY...They DO NOT represent any numbers in regards to air temp, water temp, intake size, etc...ALSO, it represents numbers that can apply to ANY SC motor that is spinning at roughly 6000 RPM, and using an external IC....These results DO NOT reflect airflow behavior above 6000 RPM, such as modded motors that spin at 8100-8600 RPM...BUT these numbers can predict what effect some mods will do at those air rates...

    For a history on the machine used and previous work done, refer to this link…
    http://greenhulk.net/forums/showthread.php?t=40111

    ************************************************** ***************

    With the legal mumbo-jumbo done, this time around we flowed the following:

    - 4TEC Intake Manifold from a 2004 RXP, complete with OEM IC, sensors, injectors, rubber hose going from SC to the throttle body, and the TB itself…It was literally taken off the motor and put on the flow bench…
    - Additional OEM IC’s from 2005 and 2006
    - 3 aftermarket external IC’s (Riva, Piranha, and XS)







    Our goal was to flow a complete system from SC to manifold exit, while seeing how it stacks up against the OEM setup…

    During testing we used the Silicone intake tubes from Piranha Parts, because they had NO BACKPRESSURE when installed. Obviously any tubing used other than theirs will alter your results, but with no restriction, its easier to compare…


    Manifold w/OEM IC’s

    The complete Manifold/OEM IC setup, including the rubber tube from the SC and 04’ IC, flowed 21.3” in/water with a blower speed of 33.9Hz, which produced our target flow rate of .460…the numbers at which 6000rpm, or cruising speed, is generated.







    We swapped out OEM IC’s and tried a 2005 and 2006 IC, and the results reflect previous flow work that showed the newer the IC the better it flowed. Results shown below.

    We then REMOVED the OEM IC entirely, which is the first thing one would do when installing an external IC. This resulted in an expected drop in BP, and the manifold/TB/rubber tube combo yielded a BP of 8.7” in/water. Surprisingly when we removed the rubber tube, and flowed the manifold direct (not normally done) the BP only dropped to 8.1”.




    Manifold w/ External IC’s

    There are several combinations of aftermarket ICs available. Getting all the IC’s together in one spot made for a test is tough, especially when you have to give parts back to people ASAP. This meant that getting a complete Riva IC piping setup was gonna be hard. Also, there is no plumbing dedicated for the XS units…

    SO for equality sake, we flowed all units with the Piranha tubes. These tubes, when connected to the IC’s alone, did not register any additional BP…They are FREE of anything!!!!


















    Once all testing was done, numbers crunched, we found that there was only a 2” in/water BP difference between all 3 systems…We attribute that to the common tubing being used. Had the proper tubing been used with the Riva setup, numbers would have been closer.


    Airflow Observed per Intake Port

    Also during testing we noted the airflow as it exited the Manifold. This was done by hand, basically feeling the airflow as it came out. With the front intake port being #1, and # 3 being next to the TB, we noted the following:

    - There is a difference in discharge flow across the manifold, not all 3 ports are the same…
    - No matter which OEM IC was installed, #3 got the most air. The farthest, or front of manifold, got the least…
    - When the OEM IC’s were removed, the airflow balance reversed, with #1 (the farthest) getting the most flow and # 3 getting the least.
    - # 2 stayed the same, no matter what OEM IC was installed.









    If you have any questions regarding the information above, please feel free to PM me…


    --Danny


    ************************************************** ***************
    BIG THANKS to Chuck, for donating a COMPLETE 2004 OEM Manifold w/IC still installed…HUGE THANKS got to Steve “Trucker Trucker” Reid for letting us borrow his Piranha IC and plumbing….Also THANKS to Snoman for his 2006 OEM IC…
    ************************************************** ***************
    Last edited by Danny; 10-22-2008 at 11:58 AM. Reason: fix picture links


  2. #2
    Were you able to come to any conclusions re efficiency, of all ICs tested?

  3. #3
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    Quote Originally Posted by VaRedneck View Post
    Were you able to come to any conclusions re efficiency, of all ICs tested?


    Its tough to measure that number, because of so many variables...but it can be done.

  4. #4
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    Thumbs up

    Never did think disbursement was even close on all 3 ports! Hence why a properly tuned intake would in fact yield positve results.

  5. #5
    Moderator Snoman's Avatar
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    How did the silicone pipes hold up against the pressure VS, the metal pipes??

  6. #6
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    Quote Originally Posted by Snoman View Post
    How did the silicone pipes hold up against the pressure VS, the metal pipes??

    They held up well, BUT, when you grabbed them and squeezed, the BP would rise...If they were installed as they are, they would be fine...But I have read that some installations the tubes are kinked a little, while on some they are not...Metal tubes are still the way to go, they can even disappate heat....

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