Dart 340 twin hood scoops

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Tom R

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I was wondering about the performance gain of the twin scoops if any versus no scoops . Did the Chrysler engineers test these or are they more for looks ? I was thinking about making the 4 inch holes just a little bigger if these scoops actually draw cold air in. Thanks all that reply
 
They really didn't add much. There was an attempt by Chrysler to make them functional by adding two plastic tubes that fit in the oblong openings in the air cleaner, but attaching them to the engine then trying to make them go into the rubber grommets in the hood when closing it was not easy so they decided it would not be worth the hassle. I have seen a pair of the prototypes...
 
On A bodys they were strictly for "appearance" It would have been cool if Chrysler had designed a "ramcharger" setup like the B bodys used, but probably cost prohibitive
 
HemiSSDart said:
They really didn't add much. There was an attempt by Chrysler to make them functional by adding two plastic tubes that fit in the oblong openings in the air cleaner, but attaching them to the engine then trying to make them go into the rubber grommets in the hood when closing it was not easy so they decided it would not be worth the hassle. I have seen a pair of the prototypes...
Click to expand...
I guess that would explain the location of the 4 inch holes .
 
I have tested the flat hood and the scooped hood back to back =
No 1/4 mile difference. they probably make the header slightly
cooler but no benefit to the engine. I run them and so does my son
on just because we like to look!
 
Since we're talking scoops, what is everyone's thoughts on the six pack hood short vs tall?

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I've got twin scoops (non functional) now but am going with a taller intake that will require a hole in the hood. I've been thinking about using the taller six pack scoop. Does this get it up into the air with positive pressure? I like the look of them and I figure if I'm gonna have to run a single scoop, it ought to make a statement.
 
NC Engine Builder said:
On A bodys they were strictly for "appearance" It would have been cool if Chrysler had designed a "ramcharger" setup like the B bodys used, but probably cost prohibitive
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I love the twin scoops on all Dodges.
However, even on the B-Body Dodges with the Ramcharger set up they were not very effective.
For the power that they supposedly gave, they weren't probably worth the added weight.
They were a sales gimmick for the most part.
The problem was that they were trying to capture surface mounted air movement, and other than at low speeds, there wasn't much to be had.
Now, the Six Pack hood was very effective on the '69 1/2 cars because the opening was big enough and above the boundary layer in the flat part of the hood.
This is what I read in the Direct Connection book years ago.
My opinion on them is that they look fantastic and on an A-Body, and with one that has the 4'' holes under them in the hood, they might be functional in the way that they would let hot air out of the engine compartment in slow moving traffic and cause some underhood circulation to take away some heat at normal speeds.
 
There were 2 small metal bowl type additions that looked like little breather bases with metal oval tubes that slipped into the 70-71 air breather that fastened to a bracket off of the second intake bolts. Would not fit AC cars. I never saw any literature on them but have seen them installed years ago on one car .

There was a set in a parts pile of a car I bought in the 80's. I only had the bracket and one seal and the bowls with tubes. Left side has a longer tube and was damaged. I planned on completing them one day but never found any parts. I still have them here somewhere.

They have very thick foam that sealed around the water dam on the hood. They could have been made by a company in the 70's . The tube had a lip with a rubber ring where it slipped into the breather. The bracket goes from side to side of the engine that they were attached to . And a hole for the throttle spring. The car was a 340 4spd. They looked factory but have no PN at all.

If I use twin scoops on the Demon I may use them. But I am kind of moving toward a snorkel. My car came with no scoops and I like the Sizzler stripe. Seemed as though they were for fresh air rather then ram air.

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I had a Air Grabber Hood on my 69 Hemi Roadrunner.

I closed and taped shut the grille and made another run back-to-back =
Zero difference on a 10 second car (Fast for it's day in the 60's)
 
Looks only as mentioned. Google Boundary Layer.

No positive function as far as performance on the cars.

They do allow the compartment heat to escape!

Funny about the 69 RR. Dudek with the FAST Hemi Runner was searching for at least one 69 that left the factory WITHOUT an air grabber set up. So he could rip that junk from under the hood.
 
GTX JOHN said:
I had a Air Grabber Hood on my 69 Hemi Roadrunner.

I closed and taped shut the grille and made another run back-to-back =
Zero difference on a 10 second car (Fast for it's day in the 60's)
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The grabber set up does look good under the hood though. All that duct work and the oval air cleaner.

The Snorkel and T/A scoop were the only scoops that forced air but you need to seal them to the breather . They were not as efficient as a pro stock but kept the factory style look. My one 69 coronet R/T came with the twin scoops . The first thing I did was installed a lift off Bee hood in 1974. That was my second R/T and came with a Six pack engine Dealer installed new with the twin scoops. All my others had the bubble hoods even my convertible.

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crackedback said:
Looks only as mentioned. Google Boundary Layer.

No positive function as far as performance on the cars.

They do allow the compartment heat to escape!

Funny about the 69 RR. Dudek with the FAST Hemi Runner was searching for at least one 69 that left the factory WITHOUT an air grabber set up. So he couldGrabber rip that junk from under the hood.
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As I recollect the 69 Hemi Roadrunner came standard with the Air Grabber
with the Hemi option. I do not know that you could delete it.
 
GTX JOHN said:
As I recollect the 69 Hemi Roadrunner came standard with the Air Grabber
with the Hemi option. I do not know that you could delete it.
Click to expand...

It was standard and he was looking for any car that came off the line without one, fast rules. Wanted to run the open element under the hood unobstructed.

Couldn't delete it, so he was stuck running the boxes.
 
Pontiac claimed 10 extra HP with their Ram Air package but at above highway speeds. I think the best combination would be a lofty supply of air, much like a dyno room.
 
Bodyperson said:
I think the best combination would be a lofty supply of air, much like a dyno room.
Click to expand...

We noticed a rather significant gain (5-7hp) on the chassis dyno when cool air was directed at the carb during a pull. My buddy tried to recreate that by sealing his carb to the hood. Now, I'm concerned that with the boundry layer that Cracked mentioned above, this all may be for nought?

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The twin scoops while they didn't do anything were a distinguisher from the base model Dart it identified the performance model probably more marketing than anything along with the tail stripe go wing etc. That being said I always liked the 68 Hemi Dart Pro stock scoop. While I dont see any "ram air" effect from the Swinger twin scoops I do see where it is a fresh air source or maybe it flushes the engine bay of excessive heat. That would be the only gain I see from them.
 
The scoops were an extra cost option on 340 Dusters/Demons.
Strangely enough they had holes in the hood on the Demon and
a rubber gasket around it BUT were cosmetic only with NO hole
on the Duster 340. They were standard only with the "Duster Twister"
(Still no Hole) BUT it was only available with a 318 and NEVER a 340.
 
When I sealed my Dart raisin bran scoop to the carb/carbs in my 62, the car slowed down. (Both with the 850/tm7, and the crossram/two 750s)
I did not do any tuning to see if it could be improved. It was easier to throw the seal into the back of the truck.
 
crackedback said:
IIRC on 1970-1972, no dual scoops at all on Duster 340's.
Click to expand...
You are generally right, but I sold several 71 Duster with the scoops
ordered from the factory when they were new.

Several Stock Eliminator Dusters still currently run them.
 
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C'mon...I've posted this before. The twin scoops are there because they're COOL. Forget anything else, they're just cool!!

Actually, on my 71 Demon 340, they're also good at letting heat out when the car is shut off.

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I had them sealed to my carb, if sealed your car will draw cooler outside air but there is little to no ram effect.
 
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