Hood Scoop Opinions....

[Sumner]

What would someone suggest for someone with a modified roadster that wanted to run both NA and blown?

I like this post. I'm learning lots.   

Option 2, down on the nose, and what I would do if........



........... there is enough room to come from the nose back inside the body with an expanding track.  Probably not,

Sum

[4-barrel Mike]

FWIW, twin-turbo small block Stude hood:



Mike

[Rex Schimmer]

Rick, I certainly understand about having lots of other things to do on your car. My guess is that you have a prioritized list and the scoop is pretty low on that list! Keep us up to speed on what you are doing with your car. Looking forward to seeing you at B'ville this summer.

tortoise,
If you also remember Frieburg went to the salt last year with a 14-71 blower sticking out of the hood and a couple of big carbs and also about 300 more hp and went slower than the NA engine with a hood scoop!. I think that the scoop on the 974 car is very effective, it ducts air to the blower and also covers it and my bet would be that it lowers the Cd of the car substantially verses having the blower just sticking out of the hood.

Rex

[tortoise]

tortoise,
. . . my bet would be that it lowers the Cd of the car substantially verses having the blower just sticking out of the hood.

Rex

No disagreement with that. I was just suggesting something like this . . .


[edit]Dodge - that didn't work! I was suggesting keeping scoop the same to rear of blower hat, then sloping gently downward instead of upward to eliminate some of the side area.

[Wester]

The Turk Camaro that Frieburger ran was able to spend a day in the wind tunnel at Gary Aikers (sp?) a couple of years ago.  Of interest was the way he changed the ENDS of the wing to improve airflow.  With the blower sitting up there I'm not sure if the intake changes they made after the wind tunnel adjustments are even valid any more.  Without the blower they really helped.  It might be worth looking at those changes.

[MAZDA1807]

 How did the engine get air?

   JL222
[/quote]

Sorry for the late response.  The scoop did not fit tightly to the carb set up.  I belive it got enough air from the grill opening.

[Glen]

Harwood has a lot of different air scoops, www.eharwood.com.  For NACA ducts  try www.gospitzer.com. Maybe you can find something to help.

[Bville701]

What would someone suggest for someone with a modified roadster that wanted to run both NA and blown?

I like this post. I'm learning lots.   

I'll go first, so everyone fire away........



........... of course I don't remember the present intake track or any of that, so this might not be practical at all,

Sum

Sum,

I like this idea and it seems more practical than the second idea, because we don't have much room under the hood. Thanks for doing those renderings!!! They look great, and give me a better idea.   

[jl222]

JL, in the "drawing" of the prop engine (in green) -- isn't that a turboprop  That is, turbine spinning a propeller through gears?  In which case the motor is likely spinning way more than 2800 rpm, and I don't know how much air a turbine engine uses vs. a piston engine, so maybe the comparison isn't valid.

  Slim that may be a turboprop engine but I was refering to large radial engines.

[jl222]

How did the engine get air?

   JL222

Sorry for the late response.  The scoop did not fit tightly to the carb set up.  I belive it got enough air from the grill opening.
[/quote]

   Prostockers seal the scoop to the carb area your lucky you didn't blow the hood off, we did from an inproper seal job.
  The hood was gone in a flash went about 30 ft in the air

              JL222

       

[jl222]

 Ryan
If thats the carb sticking out of the bodywork you and your dad have got your work cut out to make something that leaves enough space around carb and still see and be aero.
The only solution is to put a big Procharger on it. Then you could put an elbow intake on it like we did
Procharger makes the same blower as ours with a front intake.

        JL222

[maguromic]

Ryan, What about the style that's used on this F3 car.  You could take something like this and stand it vertical and cut down the bottom base and try to still keep the aero shape and then size the intake opening to the engine. When I Was at Poli-Form a couple years ago they had a mold for something very similar that they made for another modified roadster.
Tony

[interested bystander]

701-

Why don't you just get Doug Kruse , who builkt the rest of the aluminum panels on your car to built a nice scoop like he did for Don and Randy Ferguson's Modified Roadster?

All your getting on this forum is opinions, without any data, as I se it.

[jl222]

701-

Why don't you just get Doug Kruse , who builkt the rest of the aluminum panels on your car to built a nice scoop like he did for Don and Randy Ferguson's Modified Roadster?

All your getting on this forum is opinions, without any data, as I se it.

   Opinions is the topic, as far as data read Carroll Smiths books plenty of data in there about how and how not to build intake scoops including why solid suspension chassis spin there tires.

             JL222

[Bville701]

701-

Why don't you just get Doug Kruse , who builkt the rest of the aluminum panels on your car to built a nice scoop like he did for Don and Randy Ferguson's Modified Roadster?

All your getting on this forum is opinions, without any data, as I se it.

We might end up getting Doug to build us one like that, but would like to here other opinons as well.   

Ryan
If thats the carb sticking out of the bodywork you and your dad have got your work cut out to make something that leaves enough space around carb and still see and be aero.
The only solution is to put a big Procharger on it. Then you could put an elbow intake on it like we did
Procharger makes the same blower as ours with a front intake.

        JL222

We know that we got our work cut out for us, but hey I think we're getting pretty good at body work.  

Ryan, What about the style that's used on this F3 car.  You could take something like this and stand it vertical and cut down the bottom base and try to still keep the aero shape and then size the intake opening to the engine. When I Was at Poli-Form a couple years ago they had a mold for something very similar that they made for another modified roadster.
Tony

Do you know which car it was and where I can get a picture of it?