Adding NACA ducts to a 360 belly tray | FerrariChat
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Adding NACA ducts to a 360 belly tray

Discussion in 'Technical Q&A' started by mrpcar, Jun 28, 2010.

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  1. mrpcar

    mrpcar Formula 3

    May 27, 2007
    1,114
    Chino hills, CA
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    Robin
    #1 mrpcar, Jun 28, 2010
    I am curious to see if anyone had added NACA ducts to the engine belly tray on a 360 to improve engine bay cooling?

    I was told the CS have 3 additional NACA ducts on the tray, anyone know the location or have picture of a CS under tray?

    TIA
     
  2. LMPDesigner

    LMPDesigner F1 Rookie
    Silver Subscribed

    Nov 5, 2003
    3,208
    Atlanta Georgia
    #2 LMPDesigner, Jun 28, 2010
    Except at pretty high speed you will not get any benefit from adding some NACA ducts to the engine compartment on a street car.
     
  3. fioran0

    fioran0 Karting

    Jun 15, 2009
    115
    #3 fioran0, Jun 28, 2010
    i looked into this a while back and discussed it with some people smarter than me who advised that there was no benefit.
    CS does not have naca ducts but the challenge car does. this is for localised cooling though and not for general engine bay cooling. had i wanted specifics cooled then they agreed that this would be a good solution but for just general air ingress then much less so.
    i had thought it might bring up air into the engine bay and out via the rear panel whcih would keep engine temps down however i was informed that air comes in to the engine bay through the engine lid vents due to air pressure in already suffienctly large volumes
     
  4. rydermike

    rydermike Formula Junior

    Mar 27, 2010
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    Mike Donohue
    #4 rydermike, Jun 28, 2010
    Maybe with inline fans added would help , probably not enough pressure to get much flow without , a 3 inch fan will move about 135 CFM and a 4 inch about 235 CFM . They actually blow around 35 mph!
     
  5. mrpcar

    mrpcar Formula 3

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    Robin
    #5 mrpcar, Jun 28, 2010
    The only thing I have really considered besides added NACA ducts was to add a flex tube to duct air directly from the lower scoop behind the doors to duct air more directly to the engine bay. It seen besides the engine bay grills this is the only other area where the engine is getting any kind of air, but if anyone have taken the wheel well liners out you will see how indirect the air is being reflected to the engine bay.
     
  6. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Terry H Phillips
    #6 tazandjan, Jun 28, 2010
    Last edited: Jun 28, 2010
    Robin- Is your engine overheating or are you searching for a solution to a non-existent problem? If you are not overheating, best not to fiddle with airflow on a street car. Many hours of engineering went into getting the airflow correct for the 360, likely with temperature sensors plastered all over the engine compartment. You could foul up that airflow and cause localized overheating by chasing a problem that does not exist. Putting on a Challenge grille is likely the most effective change you could make.

    Taz
    Terry Phillips
     
  7. mrpcar

    mrpcar Formula 3

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    Robin
    #7 mrpcar, Jun 28, 2010
    Last edited by a moderator: Sep 7, 2017
    Terry,

    Engine is not overheating but just from my experience the engine bay is always extremely hot, so I want to take some measures to prevent any premature deterioration of other components that's subjected to this heat.

    I ran the car at local speeds for sometime without the engine under tray and noticed a much cooler running engine compartment so was interested to explore the ideas of introducing some sort of cool air duct solution.

    Currently I have the rear challenge grill, jet hot coated headers, and a heat shield for the alternator. Car already came with a heat shield for the A/C compressor which I noticed is not on some of the earlier model 360.
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  8. fioran0

    fioran0 Karting

    Jun 15, 2009
    115
    #8 fioran0, Jun 28, 2010
    Last edited: Jun 28, 2010
    As part of my previously mentioned conversation we discussed engine bay temps as this was something I was primarily concerned with.
    I had thought the challenge grill really needed a good air flow into the engine bay in order to be able to do anything and there didn't seem to be one. It was my understanding of how air entered the engine bay that was off though.
    The design is one where air pressure forces in cold air at speed down through the grills at the sides of the windows. Air flow into the compartment from other areas risks compromising this.
    As a race team they run data logging with engine bay temp monitoring and claim the bay isn't hot when driving. Once you stop then you get extreme heat soak and hot air exiting the intake grills which gives a perception that it's been very hot in there all along.
     
  9. mrpcar

    mrpcar Formula 3

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    #9 mrpcar, Jun 28, 2010
    The air entering from the side scoop of the window only provides:
    (1). right side - cool the oil cooler, air enters the oil cooler and exits directly through the wheel well opening on top of the right rear tire)
    (2). Left side - provide the air needed for the airbox air intake only.

    The only two place where air can enter is vis the bottom scoop, and the engine cover grill opening. As I've mentioned earlier, the air from the bottom side scoop is only marginal because it is not smoothly directed.
     
  10. ferrarilou

    ferrarilou Formula Junior

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    #10 ferrarilou, Jun 28, 2010
    Look also at the air intake hose ... it has large slits cut in it near there it exists at the fender well. I know some folks have changed this out with the challenge intake or equivalent, but I have always been nervous reducing any air access to the engine bay. And, of course, there is also the access behind the rear wheel wells.


    Lou
     
  11. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #11 Rifledriver, Jun 28, 2010
    He is speaking of the vents along the entire sides of the rear window.


    It ain't broke. Don't fix it.
    We service 360's with well over 100,000 miles that do not suffer from any long term negative effects that you might be imagining. They however were wise enough to leave the stock exhaust manifolds in place that were designed to keep the engine compartment within design temperatures.
     
  12. mrpcar

    mrpcar Formula 3

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    #12 mrpcar, Jun 28, 2010
    Lou,

    I kind of look at it in another way, when I took the wheel well liners off I found the rubber tube that connects the air intake scoop duct to the airbox was disconnected, sort of slipped off. So the intake was sucking in hot air in the engine bay.

    So the slits could also introduce more hot air to the intake.
     
  13. mrpcar

    mrpcar Formula 3

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    #13 mrpcar, Jun 28, 2010
    Last edited by a moderator: Sep 7, 2017
    That's a good one below the belt, but I wouldn't expect anything less from you. :) Keep them coming.

    They are stock exhaust manifolds, just jet hot coated. I am actually quit happy with their temperature performance, the headers were "cool enough" to touch within 15 minutes of shutting the engine off and I can't say the same with the stock manifolds with the tin foil wrap.

    I personally really dislike the fiberglass/wool wrap the factory used on the headers, I believe they are like a moisture wrap and allows the headers to oxidize quickly. Here is picture of a pile of oxidized iron under the exhaust manifold from a 40k mile car. (Not my car) I couldn't believe that there were so little air movement in the engine bay that they were able to pile up like this. I ran my finger through them just to make sure they are not caked on, they broke up easily like flour.
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  14. cwwhk

    cwwhk Formula 3

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    #14 cwwhk, Jun 30, 2010
    Factory headers do not use fiberglass wrap. They are encased in stainless steel heat shields.
     
  15. mrpcar

    mrpcar Formula 3

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    #15 mrpcar, Jun 30, 2010
    If you peel back the stainless wrap you will see the fiber glass heat insulation material stuff within.
     
  16. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #16 Dr Tommy Cosgrove, Jun 30, 2010
    Wait until those 360'***** the market. They will all have 30,000 miles on them then.
     
  17. mrpcar

    mrpcar Formula 3

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    #17 mrpcar, Jun 30, 2010
    Confused about that statement, are you saying that people turn the miles back on the odometer? I thought that's pretty hard to do on the digital odometer.
     
  18. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #18 Dr Tommy Cosgrove, Jun 30, 2010
    No, just a figure of speech.

    It just seems that EVERY Ferrari out there has 36,000 miles on it when it's for sale...
     
  19. mrpcar

    mrpcar Formula 3

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    #19 mrpcar, Jun 30, 2010
    I see, that's very true. Almost seems that at 30k miles they tend to blow up or something like that.
     

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