Hood scoop power? How much?

Discussion in 'Race 400/430/455' started by stage2man, Jun 19, 2003.

  1. stage2man

    stage2man Well-Known Member

    I've been thinking about a stage2 scoop for the skylark. I was trying to calculate how much power it would be worth.

    Anyone know how much this mod alone is worth typically?

    I know our motors work off atmospheric pressure to fill the holes. I also know that pressure rise is proportional to velosity squared. Pv = .5 * density or air * v^2

    @50 mph that gives me 1.04 psi increase at the scoop.

    or about 2.2 inches Hg. This should be a fair amount of boosted horsepower from volumetric eff. improvements.

    Any guesses out there.

    worth it on a street car?
  2. grant455gs

    grant455gs Well-Known Member

    I'm assuming that you're going to fab up an air box to seal to scoop?? I'm not very scientific, but this style of hood properly sealed to the carb has been known to make substantial gains at the track. I see no reason why it shouldn't also benefit a street car:Brow: :TU:
  3. buick535

    buick535 Well-Known Member

    Awell designed scoop, the stg-2 is fine, and a carb sealed to the hood should be worth at least .2 seconds in the quarter, very possibly .3 Years ago when I did my hood scoop on my 64 lark, I picked up .25 seconds. Jim Burek
  4. grant455gs

    grant455gs Well-Known Member

    Does anyone know if there is a fiberglass hood with the Stage 2 scoop ALREADY INSTALLED??!! :confused:

    If not, how come?? Any good fiberglass men(NOT ME, THAT'S FOR SURE)??:confused:
  5. David Butts

    David Butts Gold Level Contributor

    VFN sells one or did but the scoop looks more like a mopar six pack scoop to me.
  6. RED GS 1

    RED GS 1 Well-Known Member

    VFN is making one for me now.1970 bolt on fiberglass hood with a stage 2 scoop installed by them. Pricey at $605.00 plus a $15.00 crate fee and around $125 to $150 to ship. But it is what I need:TU:
  7. Robsbuick

    Robsbuick Precision Billet Inc.

    I added a Stage 2 scoop and also picked up a solid .2 once it was sealed to the hood. It is very important to seal it to the hood to get the max performance.:TU:
  8. RED GS 1

    RED GS 1 Well-Known Member

    Hey,Rob is that your name? Could you post a picture or tell me how you made your scoop sealed? I have a few thoughts,but I would like to see,hear others ideas.I have seen some in the past but never really eyeballed them.Now I need to know the tricks!:TU:
  9. grant455gs

    grant455gs Well-Known Member

    Is that a pic of your 71 in your avitar? Looks almost exactly like my 70!! (same paint and top anyways)

    Cool!!:bglasses: Nice lookin car!!:Brow:

  10. Robsbuick

    Robsbuick Precision Billet Inc.

    Hey Kenny,
    Yes my name is Rob, and yes I will post some pics of my hood scoop and how it is sealed tomorow.
  11. Mike Bucy

    Mike Bucy Administrator Staff Member

    Exactly what we picked up on my 70 GS. :TU:

    Don't forget about MPH. 3MPH in the 1/4.
  12. Robsbuick

    Robsbuick Precision Billet Inc.

    pics of hood scoop seal

    Last edited: Jul 21, 2003
  13. Robsbuick

    Robsbuick Precision Billet Inc.

    Last edited: Jul 21, 2003
  14. Robsbuick

    Robsbuick Precision Billet Inc.

    Last edited: Jul 21, 2003
  15. Robsbuick

    Robsbuick Precision Billet Inc.

  16. Robsbuick

    Robsbuick Precision Billet Inc.


    Hope this helps.
    Last edited: Jul 21, 2003
  17. grant455gs

    grant455gs Well-Known Member

    Nice lookin' car, Rob. Cheap and easy to do, but very effective.

    I curious where you got the foam sealer (part of a kit?) and what sizes are it and the air filter element (14"x 6"?)?

    The base is self explanitory (homemade, right?). Great photo. Thanks!

    The hole in the hood, did you start out with a little hole and trim to size? Or did you have a more precise way to layout the hole?
    (Probably not relavent for me, I REALLY want a fiberglass hood done professionally with Stage 2 scoop molded in.) :Brow:

    Have you ever thought about using K&N X-Stream air cleaner lid to provide even more ram air straight into engine? Any thoughts on these?

    Thanks for your time and patience!:grin:


    Attached Files:

    Last edited: Jun 27, 2003
  18. Robsbuick

    Robsbuick Precision Billet Inc.

    The foam is from a local packaging company that i do business with. I gave them the size i needed and they cut it out for me. As far as the K&N lid goes, my car is not registered at this time, and I only race the car so i don't use the air cleaner at all.
    The elements are a 14" x 4" and a 14" x 3" stacked on top of each other.
    I found the center of the hood by placing a long stud in the carb and shutting the hood just hard enough to put a dimple in it, then using a string w/ a scribe. i scribed a 15" dia circle from the center point and cut the hole w/ a skill saw.

    Hope the info helps. :TU:
  19. grant455gs

    grant455gs Well-Known Member

    You don't use a filter while racing???

    Does this improve your ET's?

    ps Yes, you did help! Thanks!:beer
  20. Robsbuick

    Robsbuick Precision Billet Inc.

    in my case, I have found that running w/ no air cleaner is worth on average about .010-.020 in ET.

Share This Page