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post #1 of 5 (permalink) Old 11-16-2002, 07:15 PM Thread Starter
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Thumbs up Cheap Street Cold Air

Cheap Street Cold Air Intake

Why does my car feel pepper in the cold mornings? Why do racers run better times in cooler weather? There is one simple answer to these questions. Cooler is better. Colder air is more dense then hot humid air. Therefore the cooler air has more oxygen for any given amount. The more oxygen in your engine, more combustion, thus more power. To gain this edge a simple, cheap intake can be made in your own driveway to provide your engine with cooler air, and more horsepower.

You will need;
Cone filter.
1 90-degree bend 3.5in to 4in (or whatever size you chose) PVC pipe.
1 foot or so straight PVC pipe of the size you chose
1 90-degree bend
Assorted PVC fittings, a closet fitting, depending on your filter.
Metal screws, small nuts and bolts for the closet fitting.
PVC cement.

1. If you haven’t already, remove your air silencerAir Silenser Removal . But instead of reassembling the car, keep the splash guard off, and the air box open. You must remove the silencer for this modification. If you already removed the silencer, open up the splash guard and the air box as described in the air silencer article.
2. Disconnect the air box lid. Look on the inside of the air box lid. There are three 8mm bolts. Remove these. Next, loosen the rubber claps that are holding the MAF to the air box. Slide the air box lid off. You will need the rubber fitting later on so set it aside.
3. The bottom part of the air box should already be unbolted, since you already removed the air silencer. So just remove that from the car.
4. Attach a 3.5in to 4in 90-degree elbow to your MAF. The 3.5in side will fit right up to that rubber fitting you removed earlier. You will also want to double-check your measurements here for the proper size tube. The MAF will be different on each application. (You may also choose to use a smaller pipe then 4in. You will need to do some grinding later on with this big of a pipe. So you may want to use a 3.5in, or 3in pipe. I used 4in.)
5. Trace around the outside of the elbow above the intake hole. You will see 4in is a little large. Push the intake aside and take out your trusty Dremal and grind out the hole a bit.
6. Fit a 4in section of 4in pipe into the elbow for a fitting. Now, fit it into the hole. Inside the fender attach a 90-degree 4in elbow.
7. This is where you will have to do some work of your own depending on the kind of cone filter you purchased. If you have a universal fit cone, you may need to come up with a series of reducers and attach them to the elbow. I went the true economical way and picked up a used cone filter from a 2000 Mustang. Follow the next directions if you chose this route.

1. Pick yourself up a PVC fitting called a closet fitting. It has a metal ring around the pipe.
2. Mark on the metal filter plate three or more different holes that correspond with the fitting and drill them out.
3. Find some hardware and bolt the filter to the closet fitting. A very good seal will be formed thanks to the foam around the base of the Mustang filter. Proceed with the rest of the steps.

8. Attach your filter setup to the 90-degree elbow using another 4in piece of pipe. Now, your setup should be completely together.

9. Before you go back and cement that pipe together make sure it fits under the hood, in the fender, and behind the splash shield. It also may be a good idea to paint it. That white pipe really stands out.
10. Glue the PVC together. EXCEPT for the last fitting before you filter, this way you can have more mobility when removing the filter. Put a set screws where decide not to glue. Go back and tighten the rubber fitting between the MAF and your first elbow.
11. Replace the splash shield, and the wheel.
12. Start it up and go for a spin. It may be necessary to remove your negative battery cable so the computer can learn the new higher flow of air.

There is some concern over the stability of the PVC pipe in the heat of the engine compartment. The piping will be far enough away from the engine not to cause any problems. I have used this set up for some time and have had no issues. Although, if the heat does concern you, spend the few extra bucks and pick up the higher heat PVC pipe.

The total cost of this project for the pipes, hardware, and filter came to about $50. If you purchase a new filter it will be a bit higher. But the best source for these cone filters cheap is the Mustang message boards. People there are selling used K&N filters that can be modified for this project for under $30 shipped. Years that the Mustang cone filters are applicable, 1999-today.

Jim Granitzki

1993 LX 5.0

Last edited by JSGAuto; 11-16-2002 at 07:44 PM.
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post #2 of 5 (permalink) Old 01-28-2003, 11:27 PM
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I just bought all that stuff to make that intake....except the funny part is that I'm redoing my toilet. HAHAHAHA. like toilet flange, you forgot the wax ring though.

1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner
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post #3 of 5 (permalink) Old 01-29-2003, 01:53 AM
Join Date: Jul 2002
Posts: 67

I have been told time and time again not to use PVC for a cold air intake because when the engine heats up it will transfer heat even where you have your filter mounted adn that heats up the PVC and causes harful chemicals to enter your intake manifold and will hurt it. I am personally using 3" exhaust tubing purchased from a local shop but you can get a U mandral bent pipe from Jegs or Summit for around $25 and it's not that hard to make a full one from the intake manifold down and you can use rubber hose fittings to conect all of it. In my estimation of cost the one I'm making with the cone will run about $70 and provide sufficient cold air to the engine.

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post #4 of 5 (permalink) Old 01-29-2003, 05:15 PM
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i have made on that goes from the tb and puts the filter in the filter, made it all out of mandrel bent steel have pics if want to see email me at [email protected] it cost me about 150 to make it, the bends were 70 and the filter was 50 then some silicon boots to connect everything those were another 30

1990 SC AOD 1.7L AR....11.75 @118
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post #5 of 5 (permalink) Old 02-03-2003, 01:02 AM
Join Date: Jan 2003
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Thumbs up Another way to make RAM air

I made a ram air system for my bird with about $3.00. I can feel the top-end diff. with it also......All i did was remove the air silencer, buy about 3 feet of 4 in. dryer tube and attached it to the bottom of my air box (where the air silencer used to be) and used a big black funnel and chopped off the end and put it on the tip of the dryer tube and screwed it to the bottom of my front air dam........its def. different but it works good for a 3 dollar mod.....good luck Mike
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