I am wondering about a hood scoop for fresh air intake. Maybe I don't understand how to get power from a CTD but it would seem fresh air comming into the air box would do a thing or two for the breathing. The air intakes are SOOO expensive no?

 

I think that might be a plumbing nightmare. To truely test ram air on a hood, I would think you need a wind tunnel test...air could be diverted above the scoop or whatever you have...not just as easy as mounting a new hood...something else, the race bikes have ram air but, we are talking sustained speeds of 150mph. Our trucks are running much slower but, they do need much more air. wonder if it would really help. The key is fresh cool air. It may help a little if you designed your ram air plumbing similar to a velocity stack to increase speed of incoming air ...really just a bunch of rambling - JKE

 

Certainly I am not looking at a ram air effect. As you stated there is no "boost" at normal driving speeds. I was just pondering a sccop to fit over the right side of the hood, plumbed/ducted to the air box-w-maybe some soft weather strip perhaps even facing rearward to prevent rain infiltration. One ting is for certain that a cooler charge has more O2 density which translated into more fun.

 

I see...you are correct. One other thing. How smooth is the air flow over the hood? What did banks do to his truck for aerodynamics? If it is very turbulant at the scoop, you will net nothing for your money. Can even create a vacuum...a long shot but, it can happen....looks great though...JKE.

Not trying to urinate in your cornflakes. Just having a conversation. I may over analyze just a bit....

 

Don't know banks but I understand this is an interesting subject. For example if you open the rear slider on some trucks air comes in?? My main thing is fresh, cool air-w-no consideration toward pressure although vacuum would be a bad thing. I am thinking just a small neat looking scoop the design of which I would leave up to the ones in the know ie. engineers. I just think one could be made that would function in a superior manner and use the existing air box-w-modifications. Like you said - just conversation.
BTW - Cornflakes are not on my Atkins diet so aim for the egg whites if U must.

 

I'm suprised Scotty hasn't jumped in here yet but here is a clue: See any hood scoops on Nascar race cars?

I am not by any means an engineer but from what I have read a scoop usually does more harm messing up aerodynamics than it does good by moving air.

Now along this line, I've wondered if you couldn't somehow exhaust hot air from under the hood by bringing air through the grill and ducting it out the top near the hood. maybe too much pressure flowing down the windshield.

 

You may not see hood scoops in NASCAR,but you did see them on the muscle cars of the 60's/70's. The turbo diesel would benefit greatly with improved air flow. Check out air bulldog hoods http://members.tripod.com/~dpofutah/id39.htm . I don't know if they offer a hood for the 3rd gen trucks,but still worth checking out. I intend to put a hood scoop over my air box on my '92.

 

If the hood complements the flow of air to the spot you want as opposed to complementing the looks, it will work. It also has to be done just right. Form must follow function in this area.
The reason the SRT 10 hood is not functional is because it does not work. Theres a lot more to it then just having openings like folks have mentioned here.

Hint hint...

 

Hey Scotty, why do you have half of your engine bay covered?

Turbo is the hint.....

JKE

 

I hate to risk beating a dead horse but I am NOT looking for added induction pressure/boost. I am simply wondering if an opening (scoop, grate, louvers-whatever)is an advantage (has to be IMO). I had an OMNI GLHS and in the hood was a square hole-w-a grate over it. I think it was more to let hot air escape and it was a shoddy job done at the Shelby factory (supposedly) but it did remove a bunch of hot air. Now back to the Ram. If the air box was extended to the underside of the hood - when closed of course - and met-w-an opening to the outside atmosphere it would be great. The "device" mounted on the hood seems to me to be something that a do it yourselfer could mount if one was proven affective and available. Scoop-w-opening in front? -w-opening in rear? or a series of openings in the sides? Why do I feel like I am pursueing an idea no one else thinks is worthy of experimentation? I could pound some Aluminum into a variety of shapes that could mount in a cosmetically appealing manner. Perhaps just a gracefull hump-w-louvers mounted-w-a gasket to the hood-w-a mounting flange turned under the perimeter of the hump and screwed/glued or riveted to the hood.
BTW we all carry guns in our trucks so shoot me if this is a wasted thread

 

the SOUTHERN COMFORT gas conversion trucks has a Cowl Hood - all Steel!!

supposed to be $700 from dealer as OEM replacement,
that's your heat release answer, not sure about diesel noise coming in cab, though.

as for RAM AIR, the camaro SS's have been proven to be not so effective, maybe due to small size, a FIPK will out perform the hood scoop on the dyno & track. proven multiple times, and beat to death on the camaro boards.

the new SS's are running a FTRA - opens the air box ( on the bottom) to the top of the air trapped in front of the radiator by the black plastic spoiler under the chin of the car.

i'm not so sure the gain is "ram air" or just allowing more air into the stock box, the OEM inlet gap is 1/2 or less. and the FIPK once again makes more power than the Ram air setup.

so a well designed intake tract (i.e., smooth like the MAC product) would seem to get more gains than one using the OEM convulted tubing, as long as it gets cool air.

i'm gonna get a MAC (been looking for a used one on here - no luck yet) and cut the front out to get cool air from behind headlight,and wrap the sheet metal protective black box in foam insulation, and seal it from engine compartment air.

Per MAC's website, air is only in the tube 1/10th of a second, not long enough to be affected by "heat soak"

A Scotty RA3 with a smooth tube down to the turbo would be the ticket.
hth?

 

Not a wasted thread. We could all learn a thing or two about thermodyanmics and the best possible means of releasing engine bay heat and capturing good intake air. This motor is consuming a serious amount of air. As long as you have no restriction on the incoming air that the turbo needs and you are providing enough volume, then the only thing to consider is the temp of the air...this is my reasoning with no scientific testing......we would have to discuss each topic separately as not to confuse the two.

Heat - proven that cowl hoods work. This is reverse exit at the windshield. Fender louvers work as well...see old camaros. I think the benefit is minimal though. Just how much heat are we trapping and is it really having a hard time getting out? I sure don't know. Maybe someone on here does...JMO.

Intake charge temp - the colder the better (at operating temp)...design a chiller to reduce temp and not produce condensation...as in refrig unit. Maybe easy, Maybe not.....or you can add spray nozzels to the bottom of your intercooler and use the washerfluid tank as supply. This would spray the intercooler with a mist and help reduce temps. I know this is a factory setup on some Japanese car. They call it a cooler cleaner ...I think some hardcore racers spray the intercooler with Nitrous. This is even better but, more money. It would be interesting to see how much the spraying would reduce the temp and this is also for short bursts. Our trucks would need something full time for the street.......the possibilities are nearly endless....imagination is a good thing...more rambling and conjecture....JKE

 

looks like we are on the same page here. The afe torque tube probably does work..trying to follow the FIPK...however, you would benefit most from the straightest path to the turbo...also proven is a slight taper in your pipe or plumbing to increase the velocity of the intake charge...ie velocity stacks from the old days of hotrodding....the changes in diameter in our system is really poor design and they used the baffles to straighten the air flow out....I do not know if the afe tube is tapered toward the turbo....time, money, jobs and such prevent most that would like to learn this stuff from actually doing it...I would enjoy testing since engineering is my thing...however, I do not have the time or resources.....I do enjoy discussing though...JKE

 

BANG!

Just kidding...I hope my post did not sway the topic too far. If you want to cool underhood temps then take the rake of the windshield and use that angle for louvers in the outer edge of the hood on both sides...this will SUCK out the heat fast rolling down the road...however, theres enough turbulence rolling down the road that it might not benefit as much as one would think.

Or, if you want air going in, you will have to study the air flow characteristics of the trucks body and then also determine at what speed you want the most air. An adjustable intake that is speed sensitive might be the answer.

My apologies if I got your thread off track a bit.
And don't worry bout my gun in my truck. Our government up here has seen fit to look after us and remove our rights to carry most firearms. They are so nice to do that for me.

 

turbo and turbos.

Its not that half the engine bay is covered...its what is uncovered.