Last Call: (Curly Howard voice) NACA, NACA, NACA Edition

So this past weekend, whilst changing the oil on our newly acquired 1999 Audi A6 Avant (Mobil 1/Mann Filter) I discovered a trio of NACA ducts in the under-engine aero tray. I have to say that NACA ducts are my jam, and this discovery endears the car to me even more than before.
Last Call indicates the end of Hooniverse’s broadcast day.  It’s meant to be an open forum for anyone and anything. Thread jacking is not only accepted, it’s encouraged.
Image: ©2016 Hooniverse/Robert Emslie, All Rights Reserved

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  1. Batshitbox Avatar

    (Chico Marx voice) Why a duct?

    1. Wayne Moyer Avatar
      Wayne Moyer

      This is the only way I can think of replying to that.

      1. Batshitbox Avatar

        …and as he leaves the studio, carrying that furshlugginer thing on his back, some wag shouts out, “I bet now you wish they’d named you Piccolo Marx!”

  2. ptschett Avatar

    Amusing car customization seen in traffic today: a receiver hitch cover that’s a replica of a Claymore mine, complete with the famous “Front Toward Enemy” notation. (Hard to see in the photo, since I allowed a proper stopping distance…)

    1. dukeisduke Avatar

      Now that is cool.

  3. wunno sev Avatar
    wunno sev

    factory NACA ducts on cars ’90s and newer are the best. you just don’t see them anymore!

    1. wunno sev Avatar
      wunno sev

      you know what? besides this, a couple of older Evos, and the Viper GTS, i can’t find the classic “flat” NACA duct on pretty much any newer cars.
      here is a picture of that Viper. so that you believe me.

        1. caltemus Avatar

          I dont think the front-facing scoops on the hellcats count as naca ducts. Doesnt have the right shape or opening; I wonder if they are as low drag as a naca

          1. cap'n fast Avatar
            cap’n fast

            NACA trivia time! what was the name of the forerunner of NASA?
            NACA duct inlets do look cool, but they don’t really work well as air inlets at high speeds. Lockheed found that out while designing the engine air inlets for the P-80 fighter plane. at low speeds, the intricate scrolls along the side edges drew the boundary layer of air into the duct which caused the moving layer above it to follow it into the duct. as airspeed went up, inertia caused the moving air to just blow past it. without the nifty scrolls along the sides, as used in the automotive world, they are less than useless and generate a lot of drag at low speed(<250kts). a round cylindrical scoop of the same opening dimension would allow better air flow and have less drag if properly faired, but then i think the NACA inlet looks a hell of a lot better too!

    2. Rob Emslie Avatar
      Rob Emslie

      Agreed. Bring back the NACA!

  4. Wayne Moyer Avatar
    Wayne Moyer

    There was an acronym that you were missing. I think you forgot NASA there. So how about some lifting bodies to move some air around.

    1. Vairship Avatar

      That, plus $6 million will get you a man!

  5. stigshift Avatar

    Certain to be immediately run over, wisely NACA ducked.

    1. cap'n fast Avatar
      cap’n fast

      ooooooooohh! pretty, pretty…..

    1. Batshitbox Avatar

      In life there are winners and there are louvers.

      1. Tiberiuswise Avatar

        Grate comment!

        1. Van_Sarockin Avatar

          So glad this is a place where everyone can vent.

          1. Vairship Avatar

            Be grill my heart!

  6. ninjabortion Avatar

    Two wheel answer is the 94-97 honda VFR’s, they could not have fit a bigger naca on these i think. The previous gens had little baby ones, and the ones after as well, but for some reason on my 96 it is just awesomely huge.

  7. Rover 1 Avatar
    Rover 1

    In sad news for many of us.
    R.I.P. Chris Amon, aged 73, due to cancer.
    Born: July 20, 1943, Bulls NZ
    Died: August 3, 2016, Taupo NZ
    Winning Le Mans in the GT40 with co-driver Bruce McLaren
    Christopher Arthur Amon MBE was a motor racing driver from New Zealand. He was
    active in Formula One – racing in the 1960s and 1970s – and is widely
    regarded to be one of the best F1 drivers never to win a championship Grand Prix.

    1. Van_Sarockin Avatar

      Terrible news. What a great racer.

    2. dukeisduke Avatar

      Prayers going up. Great driver. I remember him.

  8. outback_ute Avatar

    The first NACA ducts that come to mind on Australian cars

  9. jim Avatar

    This Ferrari F40 LM has ALL the NACA ducts :

  10. Tiberiuswise Avatar

    I’m thinking Fozzie more than Curly.

  11. dukeisduke Avatar

    Mann filters – I used them on my ’78 Fox. I bought them at the dealer (along with the copper crush washers for the drain plug). Never bothered to check to see if there was an aftermarket alternative.

    1. Sjalabais Avatar

      Haha, one would think they could come up with a more popular product with that name. Used a Mann filter on the Honda last week, too. The filter on the Toyota actually said “Toyota/Lexus”, but I didn’t bother to investigate who actually made it.

    2. dead_elvis, inc. Avatar
      dead_elvis, inc.

      “Einbau von Hand” sounds like the name of a villain in a Bond parody.

  12. Rust-MyEnemy Avatar

    The undertray for my A4 is a work of art.
    Hasn’t been on the car for at least eight years, though. No idea where it is right now.

  13. PaulE Avatar

    Along with NACA ducts in that under-tray, the other aero angle here is all those Dzus fasteners that hold that tray on. And yeah, I still miss my A6 Avant.