Air Intake
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
PVC pipe is measured on the inside diameter, so 4" PVC pipe can be different ODs depending on the schedule. The 4" I found was very thin, so it worked. Don't know about the 6637 side -- it might end up just as tight as the stock tube fitting around the outside of the filter neck. I'll go check it now and see if it will go in...
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Okay, so the piece I have is "3000 pound crush PVC sewer pipe", no schedule is indicated on it. It will not fit into the 6637 -- not a chance. It worked well for replacing the CCV coupler though, like I mentioned. It looks like 4" OD is what you need for that filter.
Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
SAk, the fit between the exhaust pipe and intake tube is pretty good. Not too tight, not too loose. The way mine had to be cocked at an angle, it actually gave me a really tight seal, especially with the hose clamp back on it.
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New User
Joined: Mar 2007
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I went and measured the piece for my Cummins. It is fairly thick. I said that it was 4"to 3" reducer, but the small side of it has an o.d. of 4". I put a 4" piece inside the bigger end of the reducer to attach the filter to. It as an o.d. of 4.5" which is perfect for the filter I am putting on the Cummins since it's opening is 4.5". I bet that could find something similar to work for the 7.3. I like the PVC because I can paint it and the engine cover to match the truck paint.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Originally Posted by SAK
I went and measured the piece for my Cummins. It is fairly thick. I said that it was 4"to 3" reducer, but the small side of it has an o.d. of 4". I put a 4" piece inside the bigger end of the reducer to attach the filter to. It as an o.d. of 4.5" which is perfect for the filter I am putting on the Cummins since it's opening is 4.5". I bet that could find something similar to work for the 7.3. I like the PVC because I can paint it and the engine cover to match the truck paint.
In my case, the white PVC replacing the CCV coupler is okay unpainted because my truck is white.
The concern about the intake tube coming off the filter without using an adapter is valid, but after a couple weeks of checking it for tightness, it's finally settled down. The first week I noticed the clamp loosening up, but I'm pretty sure that was because I was afraid of clamping down too hard on the filter. It hasn't moved and hasn't gotten loose since I torqued it down a bit more. I think it'll be okay like it is. YMMV...
Joe
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
SAK this thread has pictures of the 6637 that was on my truck. If you have a 99.5 or later you don't need any pipe to make it work. The boot clamps directly to the shoulder of the filter.
https://www.ford-trucks.com/forums/2...-my-truck.html
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https://www.ford-trucks.com/forums/2...-my-truck.html
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Senior User
Joined: Dec 2003
Posts: 331
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From: fl
Izzy351 I ended up buying a piece of 4" exhaust at Covington Diesel on 98 in Panama City that has a 45 degree bend. It will never come lose once tightened
Last edited by OTTOMATIC; Mar 14, 2007 at 05:14 PM. Reason: spelling
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New User
Joined: Mar 2007
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Originally Posted by Kwikkordead
SAK this thread has pictures of the 6637 that was on my truck. If you have a 99.5 or later you don't need any pipe to make it work. The boot clamps directly to the shoulder of the filter.
https://www.ford-trucks.com/forums/2...-my-truck.html
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https://www.ford-trucks.com/forums/2...-my-truck.html
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What is the CCV coupler that you replaced w/ PVC??
Originally Posted by Izzy351
If you have to have the adapter, then I would use the 4" OD exhaust pipe. It will be much thinner than PVC (keeping restriction to a minimum), and it doesn't have to show (no need to paint). The filter & intake tube would be flush against each other.
In my case, the white PVC replacing the CCV coupler is okay unpainted because my truck is white.
The concern about the intake tube coming off the filter without using an adapter is valid, but after a couple weeks of checking it for tightness, it's finally settled down. The first week I noticed the clamp loosening up, but I'm pretty sure that was because I was afraid of clamping down too hard on the filter. It hasn't moved and hasn't gotten loose since I torqued it down a bit more. I think it'll be okay like it is. YMMV...
Joe
In my case, the white PVC replacing the CCV coupler is okay unpainted because my truck is white.
The concern about the intake tube coming off the filter without using an adapter is valid, but after a couple weeks of checking it for tightness, it's finally settled down. The first week I noticed the clamp loosening up, but I'm pretty sure that was because I was afraid of clamping down too hard on the filter. It hasn't moved and hasn't gotten loose since I torqued it down a bit more. I think it'll be okay like it is. YMMV...
Joe
Logistics Pro
Joined: Nov 2001
Posts: 3,787
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From: Georgia
I just installed mine yesterday. Used a piece of connector PVC from Home Depot Plumbing Department. The OD is 4 inches and the conector is about 5 inches long, it fit great. Put a new clamp on the filter side. I couldn't get the 6637 to go in the stock hose at all, both are 4 inch ID (2001 model). PVC is a connector and is about 1/8 of an inch thick so I gues I'm losing some capacity but I just can't imagine it's enough to make a difference.
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New User
Joined: Mar 2007
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I am going to install the Amsoil eaau 4510 filter this Saturday. It has a 4.5" opening, so I am going to use PVC to connect with the stock intake tube. Will report back Monday, and maybe have some pictures.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Originally Posted by OTTOMATIC
Izzy351 I ended up buying a piece of 4" exhaust at Covington Diesel on 98 in Panama City that has a 45 degree bend. It will never come lose once tightened
Posting Guru
Joined: Sep 2004
Posts: 1,119
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From: Hamilton, MT
Ok! I am no pro at Filtration....But that Amsoil Filter only has a 4.5" opening and then you are gonna use PVC pipe......I may be wrong but you are kinda korking down the intake in that area and I would think that would cause some performance loss or atleast no gain. Well I hope It works out and if not atleast you have better filtration than the factory airbox and filter.
Senior User
Joined: Jan 2004
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From: Helmville MT
Originally Posted by SAK
Has anyone tried using a piece of 4" PVC? I have a local diesel shop that I think can get me a piece of exhaust for nothing, but just in case. How snug is the fit between the stock tube and exhaust pipe?
mike in montana