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  1. #1
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    More IC AIRFLOW work, Rotax Unit...

    See this thread to see what work I did previous…
    http://greenhulk.net/forums/showthread.php?t=19138

    REMEMBER, this is just AIRFLOW work…It says nothing about their cooling abilities…


    Awhile ago I did some flow bench work on OEM, Piranha, and XS intercoolers…The results were very interesting…NOW I have some flow numbers from a Rotax Racing unit, and these numbers boggle my mind…

    We ran the RR unit under the same conditions as the other units, flow rate of .460…which works out to 250 CFM on exit from the IC…The we cranked it up as fast as the blower could push, which was @ 60hz….Here are the numbers:






    The results show that the OEM IC is 52.5% less restrictive than the RR IC @ 250 CFM…(21.2-13.9 = 7.3….7.3/13.9 = 52.5% )

    The results show that the Piranha IC is 285% less restrictive than the RR IC @ 250 CFM…(21.2- 5.5 = 15.7….15.7/5.5 = 285% )

    The results show that the XS IC is 1,667% less restrictive than the RR IC @ 250 CFM…
    (21.2- 1.2 = 20….20/1.2 = 1,667% )

    And when pushed at MAX SPEED, the backpressure and flow rate were roughly TWICE that of the Piranha…
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    Last edited by Danny; 04-04-2007 at 11:12 AM.


  2. #2
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    ooops, forgot the data picture...
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  3. #3
    Water4fire's Avatar
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    So this is why the higher boost numbers from the Riva, Piranha , and XS IC's as they are less restrictive.

    Thanks danny.

    It has been tested that the RR ic cools better than them all.



    .

  4. #4
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    Quote Originally Posted by Water4fire View Post
    So this is why the higher boost numbers from the Riva, Piranha , and XS IC's as they are less restrictive.

    Thanks danny.

    It has been tested that the RR ic cools better than them all.



    .

    In theory, the longer the charge stays IN the IC, the cooler it becomes...which HAS been proven by others.

    With that said, the RR unit may be the most restrictive, but it most likey is the best for cooling...followed by the Riva/Piranha, then the XS...



    As stated before in the other thread, this is airflow work......look at it how you want....

  5. #5
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    Would the RR IC cool best because it has the lowest flow rate . . . as in, the air spends more time in the IC and therefore more time cooling because it doesn't flow out as fast as the other ICs? So what is better, lower flow of cooler air or greater flow of less cool air?

  6. #6
    Water4fire's Avatar
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    I think the better IC is the one that can find the medium point of both!


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  7. #7
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    Quote Originally Posted by cyoungesq View Post
    Would the RR IC cool best because it has the lowest flow rate . . . as in, the air spends more time in the IC and therefore more time cooling because it doesn't flow out as fast as the other ICs? So what is better, lower flow of cooler air or greater flow of less cool air?

    You don't want too much backpressure. According to the data, the motor would have to use more power and RPM to produce the same flow rate...

    As an example (numbers not exact), lets say a motor is turning 8000 rpm and pushing air through a RR unit...The airflow coming out of it is XXX CFM.......The data suggest that if you put a XS unit on there, you would get the same CFM at a MUCH LOWER rpm...Same with the other units...


    But YES, the more time the air charge spends in the IC, the cooler it will be on exit, thus resulting in a denser charger......YET spending the most amount of time yields backpressure, and this will build heat on the charge coming into the IC...Extra heat means the exit charge out of the IC will be more, and will gradually climb as long as the motor spins at a constant rpm, like a long WOT run...

  8. #8
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    Quote Originally Posted by Water4fire View Post
    I think the better IC is the one that can find the medium point of both!


    .

    That would be ideal, and from the test results, the Riva/Piranha is the current one that fits that slot...

  9. #9
    Mass VS volume! Don't forget the size of the intercooler itself!

  10. #10
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    Quote Originally Posted by Muddy River View Post
    Mass VS volume! Don't forget the size of the intercooler itself!

    EXACTLY...

    the core design on the RR was a tighter, compact design compared to the other two, which were more open and spread apart...

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