6637 conversion on excursion with picts and question
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VT Chapter Ldr
Joined: Apr 2004
Posts: 96,105
Likes: 294
From: Orange, Vermont
6637 conversion on excursion with picts and question
I did the conversion a few weeks ago, here are some picts of the stock air box and then of the 6637.
stock assembled air box
here is it is with the top off
here is the filter out of it
here is the 6637 in it, pretty easy had some left over 4" pipe, cut a section and clamped it in. Just left the temp sensor next to it.
My question is I don't really hear much air sucking but when you let off at say 2000 rpm or higher it make a sound like when air brakes blow off, chhhhhh, sound. I have this same mod on my 96 7.3 but I don't here that when I let off. Is that normal on the sd powerstrokes or something else happening?
stock assembled air box
here is it is with the top off
here is the filter out of it
here is the 6637 in it, pretty easy had some left over 4" pipe, cut a section and clamped it in. Just left the temp sensor next to it.
My question is I don't really hear much air sucking but when you let off at say 2000 rpm or higher it make a sound like when air brakes blow off, chhhhhh, sound. I have this same mod on my 96 7.3 but I don't here that when I let off. Is that normal on the sd powerstrokes or something else happening?
Postmaster
Joined: Dec 2008
Posts: 3,340
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That looks like the AIS filter and assembly. Pretty good setup, not sure if I would of gotten rid of it.
Motorcraft FA-1757 Ford 7.3 Diesel Severe Duty AIS air filter element
Motorcraft FA-1757 Ford 7.3 Diesel Severe Duty AIS air filter element
Lead Driver
Joined: Jan 2007
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From: Kiowa CO
http://www.superdutydiesel.com/pdf/0...elling_AIS.pdf
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Postmaster
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Posting Guru
Joined: Jun 2005
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From: Oshkosh Wisconsin
You guys say it's good for filtering, but how about allowing more air in then the stock normal intake? Mose people to the 6637 for better filter, but the additional large gain in the air intake amount, correct? How does AIS compare to the 6637 mod?
Postmaster
Joined: Jan 2009
Posts: 2,544
Likes: 4
From: Suffolk, VA
A big +1, you kind of took a step backwards ditching that AIS for the 6637. If for whatever reason you think you need more air, there is a fender sleeve you can add to the AIS that pulls more air from the inner fender. And those filter elements last a long time.