Air intake/filter boot size?
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Air intake/filter boot size?
Im thinking of making a poor mans cold air intake until i become rich magically ha. I was wondering what the size of the end of inlet tube is so i know what size cone filter to buy.
Has anyone else did this? suggest it or against it? Why pay 200 for a tube thats already there?
Has anyone else did this? suggest it or against it? Why pay 200 for a tube thats already there?
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Joined: Mar 2009
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From: Westby, MT
A lot of people here run the napa 6637 filter on there trucks which if i remember correctly has a four inch inlet on it. There are different manufactures of the 6637 out there put i don't know the part number off the top of my head. I am running the napa 6637 filter, i just used a 90 degree fitting and made a housing out of diamond plate aluminum, not the prettiest but it was cheap and helped performance of the truck
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Postmaster
Joined: Sep 2007
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From: Medford Oregon
Are you looking for something like this ...
If so you can make it yourself with NAPA 6637 filter but you will have to find the elbow locally, like mine. Save yourself some grief and call Clay at riffraff and he has a kit to do what you want.
Riffraff Diesel
If so you can make it yourself with NAPA 6637 filter but you will have to find the elbow locally, like mine. Save yourself some grief and call Clay at riffraff and he has a kit to do what you want.
Riffraff Diesel
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Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
A lot of people here run the napa 6637 filter on there trucks which if i remember correctly has a four inch inlet on it. There are different manufactures of the 6637 out there put i don't know the part number off the top of my head. I am running the napa 6637 filter, i just used a 90 degree fitting and made a housing out of diamond plate aluminum, not the prettiest but it was cheap and helped performance of the truck
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I found out the specs of that filter AND other part makes and models that are equivalent.
Specs. are OD-8.5", ID-4.0"(outlet), HGT-12.38"
Fram CA6818 Donaldson ECB085011, B085011, Fleetguard AH19002, Hastings AF2329, Cummins 2912986, 3912020, 3912986, Tippecanoe B08-511 Wix 46637, Napa 6637, Luberfiner LAF2531, LAF2533, Baldwin PA2818, PA2820, Fleetrite AHR-81141, AC A1474C, Air Refiner ARM-08-5011, Big A 94637, Carquest 88637
Specs. are OD-8.5", ID-4.0"(outlet), HGT-12.38"
Fram CA6818 Donaldson ECB085011, B085011, Fleetguard AH19002, Hastings AF2329, Cummins 2912986, 3912020, 3912986, Tippecanoe B08-511 Wix 46637, Napa 6637, Luberfiner LAF2531, LAF2533, Baldwin PA2818, PA2820, Fleetrite AHR-81141, AC A1474C, Air Refiner ARM-08-5011, Big A 94637, Carquest 88637
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Joined: Feb 2010
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If you want to go really cheap, just grind off the sides of your stock air cleaner lid. I just did it on mine, and definitely felt the difference. Eventually I plan on going the 6637 route, but my filter is still good, and this cost me only 10 minutes of my time. My engine is basically stock, so I think I've gotten all the air the stock downpipe can handle for now.
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Joined: Jun 2010
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I just installed the Fram CA6818 air filter its exactly the same as NAPA's 6637, there made by the same company and the Fram filter was on hand and half the price as NAPA's so i went that route.. I took pictures as i went along and moded up a peice of 4" 90/ white PCV pipe, i had to grind down the end that goes into the air filter to get it in, its tight but holds up very well... i did all this for under $50 bucks. I hope these pictures help out anyone wanting to do this them self's , its easy and done under the one beer status 
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Joined: Dec 2004
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From: Home: MT; live in Bolivia
Now, living far away from all the options and availability that most of you enjoy having at your fingertips, I have found this thread to be real useful. Thanks for the good pics, too. (yep, worth a 1000 words)
Having just dealt with Clay at RiffRaff, I wouldn't hesitate to call him again.
Having just dealt with Clay at RiffRaff, I wouldn't hesitate to call him again
.
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I just installed the Fram CA6818 air filter its exactly the same as NAPA's 6637, there made by the same company and the Fram filter was on hand and half the price as NAPA's so i went that route.. I took pictures as i went along and moded up a peice of 4" 90/ white PCV pipe, i had to grind down the end that goes into the air filter to get it in, its tight but holds up very well... i did all this for under $50 bucks. I hope these pictures help out anyone wanting to do this them self's , its easy and done under the one beer status
Logistics Pro
Joined: Oct 2008
Posts: 4,818
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From: Avilla, IN
If you want to go really cheap, just grind off the sides of your stock air cleaner lid. I just did it on mine, and definitely felt the difference. Eventually I plan on going the 6637 route, but my filter is still good, and this cost me only 10 minutes of my time. My engine is basically stock, so I think I've gotten all the air the stock downpipe can handle for now.
I've been thinking of the AMSOIL EaAU4095 airfilter. For a stock truck, hell, even a stock truck w/ a chip the 6637 will work great, but if you want to really make some power with bigger injectors and stuff, well, IMO even the 6637 isn't enough. Most people don't agree with me, but most people don't crunch the numbers or look at the data sheets either. Here's some info on the breed of filter it is:
http://www.amsoil.com/lit/databulletins/g2241.pdf
Travis has alot of info on it.
What is Hell's Gate?
Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
Don't run PVC for very long if you can help it... it WILL distort with heat and let dust into the intake. I built a Tymar replica intake for my truck, cost me about $120 but I already had a piece of 4" exhaust tubing with the right bend in it. You can source the parts from AirFlo Systems.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
If you want to go really cheap, just grind off the sides of your stock air cleaner lid. I just did it on mine, and definitely felt the difference. Eventually I plan on going the 6637 route, but my filter is still good, and this cost me only 10 minutes of my time. My engine is basically stock, so I think I've gotten all the air the stock downpipe can handle for now.
New User
Joined: Jun 2010
Posts: 3
Likes: 0
Don't run PVC for very long if you can help it... it WILL distort with heat and let dust into the intake. I built a Tymar replica intake for my truck, cost me about $120 but I already had a piece of 4" exhaust tubing with the right bend in it. You can source the parts from AirFlo Systems.
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