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Old 08-06-2003, 09:40 PM   #1
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Default Ram Air Article

For those, like me, thinking about a Ram Air system, give this article I found a read. Some pretty interesting stuff.

http://www.karlsnet.com/mopar/ramair.shtml
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Old 08-06-2003, 10:15 PM   #2
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That'* some interesting stuff.
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Old 08-08-2003, 01:48 AM   #3
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That is some pretty interesting ideas. The only problem I have is I have seen cars with the intake at the back of the engine. The hood had scoops that weren't 180 degrees to the road so lets say what he used 160 degrees comes out to be a 49.25% loss in air flow. Ok now after the air enters the intake tubing it has to make a 180 degree turn to enter the TB so now we have lost 27.91 X 2 = 55.82% of that air flow. So now lets do some caclulations.

100% of air flow avaliable.

Lets simplify both the percentages to 50% for quick cacluations.

100 * 50% = 50%

So now we only have ~50% of the air we were hopeing to get oh but wait we have to make the 180 degree corner so we take our 50% that we have now and chop it up also.

50 * 50% = 25% So what we set out to acheive only gained us ~25% of what we were wanting.

I know 25% of a 3" pipe at 70MPH is still a lot but why would car companies waist all of the perfomance on a few degrees of the intake position and curves of the pipe.

I am sorry I can't agree with the curves in the pipe. He did his test with a "High Power Turbo Honeywell fan" WOW that had to be pushing some air. LOL. If you are going 55MPH with a 30 sq.in. opening you are going to be getting some pressure the degrees of the angles are not going to matter much once the air, at 55mph, gets into that tube there is only one way out, through the engine. It is not like it is going to back up and not let any more air in. I am not saying angles in the pipe are not going to make a difference, I just think they are a bit off of what you would accually get if you were going down the road and had some real air, instead of a fan.

I can agree with the angle with relation to the road but I think it is even over exagerated. He says the 110 degree is 545% more restrictive than 180 degree. That means at 55mph it will only be getting a ~10mph wind.
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Old 08-08-2003, 02:57 AM   #4
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Well i actually had some 4" ducting in my car the last 2 days... Pulled it out this morning. But when i was looking around i realized how well the new 3" stuff i picked up would fit in the bumper and run to the other side.... So now i might set up a dual ram air system.
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Old 08-08-2003, 06:08 AM   #5
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I wish it was possible to make something large enough to use the whole space of the bottom hole in the bumper, and route that to a 3-4" tubing, then to the filter. That would increase air flow but would definitely cut down on air into the radiator.

Sounds like the quickest way for a ram air system would be to take out the driver side headlight That would look like though. There'* always a sacrifice.
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Old 08-08-2003, 12:43 PM   #6
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It would be very easy to make something to go along the entire lower airdam but I really don't want to take that air from my radiator. I might make something to take air from the two outside holes so the middle ones still cool the radiator.
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Old 08-08-2003, 07:00 PM   #7
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Ok, i've decided to run my Ram Air system like this, i'll have two intakes, a PVC end on each side, wth 3" aluminum ducting in the whole system. The one on the passenger side will run up behind the bumper (fits nicely it looks like) and will join up with the drivers side one and will dump right infront of the intake tube on my 93. I don't want to hook it up to it yet, cause i don't want to cut up the factory box, and i might get a tube/cone in a little while. The ram air will be perpendicular to the intake tube like i tested it this week, this way, rocks, water, and birds can't get up into it. But all the air is available, and it will aslo help cool the engine compartment a little, and keep air pressure high by the intake.

Anyone considered cutting out the part thats right between the headlights and the trim going around the bumper and putting in scoops there?

I did see some flat 2-3"x7" or so rectangular box sections that turned into a circle at an angle, but it would be too big, and suck too much from the rad in my opinion.
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Old 08-09-2003, 12:02 AM   #8
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ive played with making a rectangular scoop out of cardboard or something and hanging it from the bottom of the car. Spray paint it black so it cant be seen easily, and make the opening the same/greater area of the tube. You could but it in front of the undercairrage shield.
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Old 08-09-2003, 02:16 AM   #9
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Ok here are some details of what i just put in. I have a PVC drain end at each side of the air dam opening, they start out around 2" and have a flare to 3". I pulled back the heavy cloth between the radiator sides and bumper and rolled it between the bumper support incase i wanted it back in the future.I used 3" Dryer duct for the whole thing, and a tube of 8' (when opened fully) had some extra left over. I painted the PVC drain ends black with some Krylon Fusion made for literally any surface you'd want to paint. Then i kept test fitting, bending, cutting, test fitting etc until i got the tubes where i wanted. Cut a hole in one for the other to join in, and used some Clear Caulk to seal up the junction, and also where the ends meet the ducting. I used some galvanized wire to hold it in place, and the one from the passenger side fits PERFECTLY inside the bumper. It'* like it was made for 3" tubing... Haven't driven it yet, but i expect better results then my 4" duct that was kinda pointed down that kicked butt. I'll post pix sometime soon.
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