6637 Mod
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
)
Laughing Gas
Joined: Jun 2009
Posts: 903
Likes: 0
From: So Cal
Define "swimming"? It seems to be a paper core filter. With one of Pete's covers - it'll probably handle a few splashes just fine... but if you're motorboating it you might consider a full snorkel kit.
Posting Guru
Joined: Oct 2006
Posts: 1,078
Likes: 2
From: New London, Mo
do you guys live like were there is not dust or dirt lol i normally wash under my hood everytime i wash my truck and i wash it at least once a week and she never looks as clean under the hood as ya'lls
Laughing Gas
Joined: Jun 2009
Posts: 903
Likes: 0
From: So Cal
Open CCV + Ignorance + Chevron Delo = Oily Smoke + New Air Filter
I live Socal... if the dust doesn't get it... the smoke from the seasonal wild fires or the genius with the leaf blower does. 
(At least once a week... this genius gives me a reason to wash the truck. I try to wash it just after they've been in the neighborhood.)
You would have to be a bit more careful washing under the hood - but unless your truck does a lot of swimming when you go off-roading... it's still cheaper and works better than most of what's out there. I am completely happy with mine.
To be completely fair - I did managed to mess mine up... as difficult as that might seem. I ran with my ccv open for a few days while I was working on the truck... the one time that I used Chevron Delo oil (never again... smokey, stinky stuff... my truck seems to absolutely love Rotella). It idled fine and ran great for regular driving - but I was losing power at high RPM... looked all over for the cause and realized that the smoke had gotten my very attractive Pete's Cover kinda dirty.
I finally put two and two together... and changed the air filter today. Turns out the oily residue is terrible for a paper core filter. Even though the filter didn't look too bad... the difference was like night and day. (I can't tell you how happy I was to realize that I was merely a victim of my own stupidity.
) Immediately I noticed a smoother idle, better acceleration and less smoke driving on surface streets in 'sport' mode. (If you're having fun... it'll give a little puff now and then to let the guy in the dodge know what you're thinking... and at wot it might still fog a prius) Getting on the freeway... the first on-ramp was a religious experience without the usual smoky fanfare. Turns out, this is the first time my trucks has been "right" since I did all the work. Got rid of my lag, no more bogging at high rpm, no more power loss at high RPM and more power than I've ever experienced in a pickup truck. 
All I could say was "WOW"... and continue grinning like an idiot. 
On that note, I think I'm going to go back to using the stock filter minder for the time being, although I know folks have mixed feelings on it. There are apparently better quality versions available which I'll switch to when I get time.
A thought... If anyone is ever curious about just how much difference an air filter can make... I'll save my dirty one for the next dyno or track day.
(At least once a week... this genius gives me a reason to wash the truck. I try to wash it just after they've been in the neighborhood.) You would have to be a bit more careful washing under the hood - but unless your truck does a lot of swimming when you go off-roading... it's still cheaper and works better than most of what's out there. I am completely happy with mine.
To be completely fair - I did managed to mess mine up... as difficult as that might seem. I ran with my ccv open for a few days while I was working on the truck... the one time that I used Chevron Delo oil (never again... smokey, stinky stuff... my truck seems to absolutely love Rotella). It idled fine and ran great for regular driving - but I was losing power at high RPM... looked all over for the cause and realized that the smoke had gotten my very attractive Pete's Cover kinda dirty.
I finally put two and two together... and changed the air filter today. Turns out the oily residue is terrible for a paper core filter. Even though the filter didn't look too bad... the difference was like night and day. (I can't tell you how happy I was to realize that I was merely a victim of my own stupidity.
) Immediately I noticed a smoother idle, better acceleration and less smoke driving on surface streets in 'sport' mode. (If you're having fun... it'll give a little puff now and then to let the guy in the dodge know what you're thinking... and at wot it might still fog a prius) Getting on the freeway... the first on-ramp was a religious experience without the usual smoky fanfare. Turns out, this is the first time my trucks has been "right" since I did all the work. Got rid of my lag, no more bogging at high rpm, no more power loss at high RPM and more power than I've ever experienced in a pickup truck. All I could say was "WOW"... and continue grinning like an idiot. On that note, I think I'm going to go back to using the stock filter minder for the time being, although I know folks have mixed feelings on it. There are apparently better quality versions available which I'll switch to when I get time.
A thought... If anyone is ever curious about just how much difference an air filter can make... I'll save my dirty one for the next dyno or track day.
Cross-Country
Joined: May 2009
Posts: 56
Likes: 0
From: Ohio
One person asked me about not having any shroud around the filter to keep the engine heat away from the filter? i thought it was a good question. Isn't that why K&N and the like sell the kit with side walls around the filter? I want to do this mod but would like some feed back on this question.
Senior User
Joined: Apr 2011
Posts: 388
Likes: 0
From: Long Beach,CA.
One person asked me about not having any shroud around the filter to keep the engine heat away from the filter? i thought it was a good question. Isn't that why K&N and the like sell the kit with side walls around the filter? I want to do this mod but would like some feed back on this question.
Laughing Gas
Joined: Mar 2007
Posts: 898
Likes: 23
From: Tucson
I'd be interested in this info too. Does anyone sell these or at least have plans with measurements that can be used to make a cold air box for the 6637?
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Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
Yes, manufacturers are good at selling points to convince you to buy their product. I don't think the whole cold air thing makes that much of a difference. Once you are at highway speeds, underhood temps aren't too far from ambient temps. It's only when you're stopped idling that you will have an appreciable temperature variance. From a power standpoint, then it doesn't matter.
Senior User
Joined: Apr 2011
Posts: 388
Likes: 0
From: Long Beach,CA.
Yes, manufacturers are good at selling points to convince you to buy their product. I don't think the whole cold air thing makes that much of a difference. Once you are at highway speeds, underhood temps aren't too far from ambient temps. It's only when you're stopped idling that you will have an appreciable temperature variance. From a power standpoint, then it doesn't matter.
Senior User
Joined: Apr 2011
Posts: 388
Likes: 0
From: Long Beach,CA.
Mark,
I used a 3" ID, 4" OD PVC coupler to replace the CCV coupler, but did what you did with the filter. However, I had a piece of 4" OD SS exhaust sent to me a while back and replaced the coupler and put one on the 6637 connection as well. The PVC after almost a year was starting to distort, so I think it's a good idea to use the metal piece instead. For one, it has a much wider ID than the PVC, and it certainly won't distort. I also found that the 6637 neck kept getting smaller & smaller under the load of the clamp (which is why you have to keep an eye on it and keep it tight). In fact, I had a heck of a time getting the exhaust to fit inside the neck. I had to use a hair dryer and quite a bit of force to get it down in there.
Here is before:
Here's after with the SS pipes in place:
It works with PVC and/or directly connecting the filter to the tube, but it's better with the pipe and there's no worry about it coming loose. I was constantly worried about it popping off before, now I'm quite sure it ain't goin' nowhere...
I used a 3" ID, 4" OD PVC coupler to replace the CCV coupler, but did what you did with the filter. However, I had a piece of 4" OD SS exhaust sent to me a while back and replaced the coupler and put one on the 6637 connection as well. The PVC after almost a year was starting to distort, so I think it's a good idea to use the metal piece instead. For one, it has a much wider ID than the PVC, and it certainly won't distort. I also found that the 6637 neck kept getting smaller & smaller under the load of the clamp (which is why you have to keep an eye on it and keep it tight). In fact, I had a heck of a time getting the exhaust to fit inside the neck. I had to use a hair dryer and quite a bit of force to get it down in there.
Here is before:
Here's after with the SS pipes in place:
It works with PVC and/or directly connecting the filter to the tube, but it's better with the pipe and there's no worry about it coming loose. I was constantly worried about it popping off before, now I'm quite sure it ain't goin' nowhere...
Lead Driver
Joined: Nov 2007
Posts: 5,578
Likes: 1
NAPA 6637 filter
4"od x 4 long pipe
4" constant velocity clamp
You win. I am sure you could figure out the proper order from that, but there is a link in my sig that will show you how to do it, IIRC. It is simple! If you want to get a little more complicated there is a cold air box option that just came out last week. That would be a pretty sweet little improvement.
4"od x 4 long pipe
4" constant velocity clamp
You win. I am sure you could figure out the proper order from that, but there is a link in my sig that will show you how to do it, IIRC. It is simple! If you want to get a little more complicated there is a cold air box option that just came out last week. That would be a pretty sweet little improvement.
P.S Miss ya Markadeck! Hope we will meet one day when my time comes.
I probably read right over it! Thanks for posting though!
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Michael.simmons232
1999 - 2003 7.3L Power Stroke Diesel
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Mar 19, 2013 08:35 PM
