Ram Air Concept
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Freshman User
Joined: Apr 2006
Posts: 48
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From: Hancock, ME
Ram Air Concept
Here is a ram air idea i came up with. The dual scoops woould be positioned under the bumper. I would make the opening dimentions to be about 4''x12'', maybe a little bigger. Each scoop would have a flat filter halfway up. Each outlet would go to one of the intake hoses on the trottle body. Would this do much for a 302 '92 F150?
Elder User
Joined: Feb 2006
Posts: 537
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From: Formerly Nawlins
It would if you plan on putting it through bottom of the bumper deep water. It would create a 5 litre water pump ... for at least a short time. You have to have a failsafe if you put rams close to the ground .... I know on a 150 it's not that close, but I have seen some driven through some of our floods.
Junior User
Joined: Jul 2003
Posts: 88
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From: St. Pete, Fl.
SilverSport is right. At one time, Ford had the cold air pickup down low and then moved it up for just this reason. Knew a guy that lost an engine while trying to navigate some deep water. It wasn't pretty.....
Post Fiend
Joined: Oct 2003
Posts: 6,214
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From: New Jersey
A ram-air system basically is a funnel - collecting slow moving air with a wide snout, and channeling it through a gradually narrowing area to the throttle body, which increases it's velocity and possibly it's pressure if the throttle body is partially closed.
The problem with most ram-air systems is the openings are smack against the body of the vehicle, right in what's called a "boundary layer", which is slow moving air right against the vehicle surface.
This is why F1 Indy cars, funny cars and so forth, always have "necks" on their scoops - to put the inlet of the ram air ABOVE the boundary layer to maximize the airflow going in.
The "ram air" hoods of the 70's, the dodge Ram pickups, and the Subaru Forrester and related models, all put the inlets right on the hood surface which cancels out the benefits of a ram-air system.
The other factor is speed - you're not going to be able to notice or measure any useful benefit at lower speeds - i.e. below 100mph or so, even though your truck has a massive impact on the air it plunges through while driving.
The problem with most ram-air systems is the openings are smack against the body of the vehicle, right in what's called a "boundary layer", which is slow moving air right against the vehicle surface.
This is why F1 Indy cars, funny cars and so forth, always have "necks" on their scoops - to put the inlet of the ram air ABOVE the boundary layer to maximize the airflow going in.
The "ram air" hoods of the 70's, the dodge Ram pickups, and the Subaru Forrester and related models, all put the inlets right on the hood surface which cancels out the benefits of a ram-air system.
The other factor is speed - you're not going to be able to notice or measure any useful benefit at lower speeds - i.e. below 100mph or so, even though your truck has a massive impact on the air it plunges through while driving.
Post Fiend
Joined: May 2004
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From: Lakewood, Ohio
Originally Posted by frederic
The problem with most ram-air systems is the openings are smack against the body of the vehicle, right in what's called a "boundary layer", which is slow moving air right against the vehicle surface.
The "ram air" hoods of the 70's, the dodge Ram pickups, and the Subaru Forrester and related models, all put the inlets right on the hood surface which cancels out the benefits of a ram-air system.
The "ram air" hoods of the 70's, the dodge Ram pickups, and the Subaru Forrester and related models, all put the inlets right on the hood surface which cancels out the benefits of a ram-air system.
on an f150 ram air is not going to help.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
And I'll add that unless the whole intake tract from the scoop to the throttle bodies is shaped correctly there will be no ram air effect. You'll need some pretty fancy fluid dynamics modeling software to accomplish that. The hood scoops and ram air hoods you see on modern automobiles look cool but generally are no more than a cold air intake.
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Senior User
Joined: Dec 2006
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If you could somehow make your headlights ridiculously smaller (side to side) you might be able to stuff some intakes in there. Probably not enough to make a difference though.
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Elder User
Joined: Feb 2006
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From: Formerly Nawlins
Mine has that too ... it is stock, but it has a downturned spout to help keep water out.
As for the Subaru that fredric mentioned, the scoops that Subaru uses are not for ram air, they are for channelling air into the intercooler, those are Turbo Boxer engines.
I have the Mach1 NASA hood on my Stang ... I don't have any of the ram air components. I haven't driven the car in ages, but I used to get wet filters when I had the 70's - 80's free flow filters in it whenever I drove in the rain. And there was no channel taking the water directly into the filter.
Your ram air design is a workable item, on the strip ... where you can race without filter 1/4 mile at a time, not a good item for daily or street use.
As for the Subaru that fredric mentioned, the scoops that Subaru uses are not for ram air, they are for channelling air into the intercooler, those are Turbo Boxer engines.
I have the Mach1 NASA hood on my Stang ... I don't have any of the ram air components. I haven't driven the car in ages, but I used to get wet filters when I had the 70's - 80's free flow filters in it whenever I drove in the rain. And there was no channel taking the water directly into the filter.
Your ram air design is a workable item, on the strip ... where you can race without filter 1/4 mile at a time, not a good item for daily or street use.