I want to try a different hood scoop......

[Cranky]

From the research I've done, I think a RA system is better however, you would need to use a cowl style hood to slick up the front of your car and cover the carbs so you may as well use it. How deep into the 8's are you running and how much of a bulge would you have to have in your hood to cover the carbs?

 

[SUPERSTOCKRACER]

From the research I've done, I think a RA system is better however, you would need to use a cowl style hood to slick up the front of your car and cover the carbs so you may as well use it. How deep into the 8's are you running and how much of a bulge would you have to have in your hood to cover the carbs?

Mid 8's and I'll need 3"+ from the opening of the hood

 

[coloradodave]

Mid 6s with a hole in the front of the car...

 

[dvw]

Za! thanks Jay!



makes sense Hawk!

thanks for helping out a noob guys! :sSig_noob:

and now back to our regularly scheduled programming...:happy1:

Have you actually ever run a cowl yourself? The gap at the windshield is critical. Testing has shown us that there can actually be lower pressure inside the under hood area, sealed area (measured with a racepak).
Doug

 

[Cornpatch MO]

Well, if you want to go nostalgia, go with a Fiord Thunderbolt hood scoop. Openings in the back and very slick in the front. It was all the rage in the mid 1960's...........................MO

 

[747mopar]

Ever thought about making your own? This is the shaker scoop I made for my Charger, just cut a mold out of wood and glass away.

 

[SUPERSTOCKRACER]

From the research I've done, I think a RA system is better however, you would need to use a cowl style hood to slick up the front of your car and cover the carbs so you may as well use it. How deep into the 8's are you running and how much of a bulge would you have to have in your hood to cover the carbs?

Cranky, what's a RA system ?

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Well, if you want to go nostalgia, go with a Fiord Thunderbolt hood scoop. Openings in the back and very slick in the front. It was all the rage in the mid 1960's...........................MO

I went that route back in the early 70's and I liked it Had one on my 65 chevelle SS

 

[coloradodave]

Well, if you want to go nostalgia, go with a Fiord Thunderbolt hood scoop. Openings in the back and very slick in the front. It was all the rage in the mid 1960's...........................MO

They worked well, but they were running in the 12s...

 

[james vignogna]

how about one of these cowl but not Chevrolet!!!!!!

 

[Ron Ward]

I know one reason so many folks run the cowl hood is due to the rules the sanctioning body has put in place. I know for a fact that the NMCA and NMRA (yeah, those Blue Oval guys) have strict rules regarding hood scoops and many of the classes prohibit any forward-facing scoops, regardless of whether the car was factory equipped or not.

At speed, there is a boundary layer of air that sits right on top of the hood. This air doesn't move much and is not a good source for the ram effect most people are trying to get when they use a scoop. The opening in the scoop must be above the boundary layer of air for any ram effect to take place. The old Direct Connection Bible had a good section in it regarding hood scoops... I may dig it out and post some pics out of it.

 

[Budnicks]

I think your 100% correct, that the current hood scoop is hurting your ET & MPH, it's a little overwhelming aero hindrances/disadvantage already, but cool as hell none the less...

But the one Harwood scoop you had showed in the link,
isn't to bad for a dedicated a Race car...

But can you get one already molded to the hood from someone ??
Paint it, then just swap hoods when & if you need to be more Mopar correct looking,
seems there's always a tradeoff when it comes to style & speed, especially nostalgic appearing, but that's really your choice, on how to apply it...

IMHFO the easiest, most aerodynamic & probably quickest too,
would be the Cowl Induction Hood
{even if it's originally a GM style hood, even they never had a 6"-8" tall version either}
who give a ****, what others think, especially if your putting them on the trailer
& if it works & goes quicker & faster, I know I wouldn't...


when you seal off under the hood to the carb, not only does it give you a ram air effect & forced induction worth a few HP it only fills the area up until it starts forcing/ramming the air thru the carbs, then the air is pretty much a dead space will not let as much in
{acting like a parachute/big sail out in the air/areo-drag}
& won't catch as much dead air, as it would with it not being sealed to the carbs & hood...

If you get what I'm saying...

good luck what ever you choose...

 

[SUPERSTOCKRACER]

I do have a spare hood to put a different scoop on, and swap out if needed. I do need the original hemi scoop for another project so this might be the way to go.
I'm leaning towards the aero scoop right now, but just not sure.
My bodyman will hve no problem glassing in my scoop to the hood. He's going to have to fill in the holes anyway.

 

[HT413]

when you seal off under the hood to the carb, not only does it give you a ram air effect & forced induction worth a few HP it only fills the area up until it starts forcing/ramming the air thru the carbs, then the air is pretty much a dead space will not let as much in
{acting like a parachute/big sail out in the air/areo-drag}
& won't catch as much dead air, as it would with it not being sealed to the carbs & hood...

If you get what I'm saying...

good luck what ever you choose...

I bet we can calculate the approx correct size opening. Im thinking we figure the cfm you draw, try to guesstimate the velocity the air fuel mixture has through the intake and choose a scoop to maintain that velocity through the opening, this will minimize the parachute effect. It would be neat if we could design it to approximate the exterior air speed, so it would produce zero parachute drag.

 

[Budnicks]

US Body Source in the misc. section has a 5" Cowl Hood "in steel" $229

55 3/8" long x 24 7/8" wide x 5" tall

I think they'll make you a custom scoop too, to your specs,
it' won't probably be cheap thou, not that that's an issue...

I think if a Pro Stocker making appr. 1500hp can run a 6" round opening & feed those beasts, with basically 4) nearly 700cfm 2bbls/split Dominators, then that surface area would be more than plenty, might loose a little velocity at 160-170mph plus speeds & 1000hp vs 210mph & 1500hp a 4" round hole would probably be enough opening {with out doing all the math/calc's of what's he's got, if the shape of the scoop was correct...

check out this & inter the criteria it'll give you gains in hp via mph etc., not sizes thou
http://www.wallaceracing.com/ram-air-calc.php

for a list of the multitude of racing types of Calculators
http://www.wallaceracing.com/Calculators.htm

 

[SUPERSTOCKRACER]

US Body source in the misc. section has a 5" Cowl Hood in steel

For a 65 coronet?

 

[Budnicks]

For a 65 coronet?

No just a scoop

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I don't think they have anything for a 65 Dodge Coronet, I'd have to look again

 

[SUPERSTOCKRACER]

No just a scoop

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I don't think they have anything for a 65 Dodge Coronet, I'd have to look again

I looked already. I cant use a steel scoop on a fiberglass hood.

 

[bobtile]

I can steal James Vignognas scoop for you while I'm there tomorrow.

 

[SUPERSTOCKRACER]

I can steal James Vignognas scoop for you while I'm there tomorrow.

Would ya do that for me? He won't know.lol
stay away from my 588

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keep your hands off my dual quads too.

 

[bobtile]

Would ya do that for me? He won't know.lol
stay away from my 588

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keep your hands off my dual quads too.

No promises. You know how I get around 588's. They make me all warm and fuzzy inside.