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haul_n_horses2
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Member
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Member # 21227
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Reged: 04/22/02
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Posts: 3752
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Loc: Ann Arbor, MI
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Stock air box restriction
#1346353 - 08/16/03 06:48 PM
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In preparation to installing a severe duty AIS, I decided to get some baseline measurements of the air filter restriction. I had an Ashcroft gauge which measures vacuum in inches of water (Full scale 0-100 inches, 14.5 (or is it 13.5?) inches of water equals 1 in of Hg) sitting in the toolbox leftover from studies of fuel system restriction. I removed the filter minder and plugged a 1/4" NPT to barb fitting in its place. No leaks that I could detect. Ran the hose into the cab and hooked up the gauge. Most normal driving conditions the gauge fluctuated between 2 and 4" of H2O. WOT went to 9-10" of H2O. Well less than 1 in of Hg. Stock turbo and exhaust except for Walker BTM in place of factory muffler. Stock airbox with no mods. New Motorcraft airfilter (the new version, I can't remember the number off the top of my head) in the box with less than 2k miles on it.
This gauge is not really sensitive enough to make these measurements but it is much better than most readily available gauges. I wish I had made similar measurements before selling the AFE Magnum filters. Why switch from the Magnum back to stock, you ask? Because the silicon levels in my oil analysis kept going up to an unacceptable level with increased wear metals.
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GreatWhite2
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Member
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Member # 33612
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Reged: 07/24/03
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Posts: 12
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Loc: CA
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Re: Stock air box restriction
#1346369 - 08/16/03 07:09 PM
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What are they charging for the Severe Duty AIS? Heck of a good element in it.
Probably less than I paid for my UMP Superfilter picture . Same company "Donaldson" makes the filters, but mine is a massive paper element. Yours is the new technology.
Please post your impressions when you've gotten it installed.
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haul_n_horses2
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Member
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Member # 21227
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Reged: 04/22/02
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Posts: 3752
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Loc: Ann Arbor, MI
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Re: Stock air box restriction
#1346375 - 08/16/03 07:13 PM
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Quote:
What are they charging for the Severe Duty AIS? Heck of a good element in it.
Probably less than I paid for my UMP Superfilter picture . Same company "Donaldson" makes the filters, but mine is a massive paper element. Yours is the new technology.
Please post your impressions when you've gotten it installed.
They are running $190 delivered and the element is supposed to be good for about 30K miles. I will post the numbers when I get the new filter installed.
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BeachCity
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Member # 27927
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Reged: 12/29/02
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Posts: 734
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Loc: Ocean City, MD
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Re: Stock air box restriction
#1352676 - 08/21/03 11:28 AM
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Haulin,
Just curious, did you get any readings on the AIS yet?
Erick
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haul_n_horses2
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Member
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Member # 21227
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Reged: 04/22/02
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Posts: 3752
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Loc: Ann Arbor, MI
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Re: Stock air box restriction
#1352722 - 08/21/03 12:17 PM
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No. It will be a couple of weeks before I have it in. Have horseshows every weekend through labor day.
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haul_n_horses2
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Member
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Member # 21227
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Reged: 04/22/02
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Posts: 3752
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Loc: Ann Arbor, MI
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Re: Stock air box restriction
#1383856 - 09/13/03 06:01 PM
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Just to update these data, I installed the severe duty air induction system today. Kit installs very easily. So, I plugged in the Ashcroft gauge and drove a few miles to see if the restriction is different ie., does it breath easier? And the answer is .....................NO. At a steady speed the restriction is 2-4" of H2O just like the stock filter. At WOT the vacuum increases to 12" of H2O, 2" more than the OEM filter. So it appears that the Severe Duty filter by Donaldson breaths about the same as the Motorcraft (1755?) filter. It should have a much longer life before it is necessary to change it. We shall see. I will follow up with the silicon levels at my next oil change.
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LarryM
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Moderator
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Member # 14468
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Reged: 06/19/01
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Posts: 9550
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Loc: N. Va .. 2 USN FA-18 E/F sons
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Re: Stock air box restriction
#1383894 - 09/13/03 06:29 PM
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Paul,
Where is the stock filterminder on both the stock and AIS airboxes. I've had my air restriction gauge (Ashcroft 0 - 30 inH20) in for a about a week and I plumbed it in at the outlet of the factory airbox in the rubber tubing. Like you at idle I get like 1 to 2 inH20, cruising unloaded around 5, and mashing it from 0-70 at WOT have seen close to 20 to 22 inH20. Vacuum Gauges Pictures. This is with the AMSOIL air filters and of course I have a Van. Haven't towed with it yet which will be next week.
I'm sure you've watched the dialogue on the AIR and that FORD evidently specs out the PSD air system as 25 inH2O max at the outlet of the Airbox and evidently the AIS filterminder is calibrated based on this spec. Thus you might not be able to compare directly the stock and AIS airbox if the vacuum measurement location is different. 
Off topic: when you had your gauge in the fuel system, did it go back to zero each time you shut down or did it only go back to around 5 to 10 inH20  Also, what was the vertical distance between you gauge and the fuel pump ... mine is close to 5 feet. 
Larry
Edited by Larry M (09/13/03 06:34 PM)
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haul_n_horses2
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Member
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Member # 21227
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Reged: 04/22/02
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Posts: 3752
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Loc: Ann Arbor, MI
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Re: Stock air box restriction
#1383923 - 09/13/03 07:00 PM
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Quote:
Where is the stock filterminder on both the stock and AIS airboxes?
No motion in the stock filterminder. Haven't tried the new filterminder yet.
Quote:
Like you at idle I get like 1 to 2 inH20, cruising unloaded around 5, and mashing it from 0-70 at WOT have seen close to 20 to 22 inH20. Vacuum Gauges Pictures. This is with the AMSOIL air filters and of course I have a Van. Haven't towed with it yet which will be next week.
I'm sure you've watched the dialogue on the AIR and that FORD evidently specs out the PSD air system as 25 inH2O max at the outlet of the Airbox and evidently the AIS filterminder is calibrated based on this spec. Thus you might not be able to compare directly the stock and AIS airbox if the vacuum measurement location is different.
I plugged the gauge into the rubber gasket for the filter minder in both filter boxes. They are similarly located in both boxes. Should be comparable measurements.
Quote:
Off topic: when you had your gauge in the fuel system, did it go back to zero each time you shut down or did it only go back to around 5 to 10 inH20 Also, what was the vertical distance between you gauge and the fuel pump ... mine is close to 5 feet.
Went to zero each time. Mine was about 2 to 2.5 feet above the pump ie., in my lap.
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LarryM
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Moderator
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Member # 14468
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Reged: 06/19/01
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Posts: 9550
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Loc: N. Va .. 2 USN FA-18 E/F sons
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Re: Stock air box restriction
#1383947 - 09/13/03 07:21 PM
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Quote:
I plugged the gauge into the rubber gasket for the filter minder in both filter boxes. They are similarly located in both boxes. Should be comparable measurements.
You might be a little careful on that assumption. You can see where my factory filteminder is located HERE and I have my current gauge plumped into the rubber tubing right after the plastic airbox in the middle. I also, measured the vacuum that my stock filterminder moved at and reported the results HERE. As you can see with what I measured at the outlet to the airbox the filterminder in the stock location should have moved but it didn't. I'm starting to question not the filterminder as being accurate, but where it's plumbed into the system to give an accurate measurement of what FORD specifies for this engine and where we should be measuring air restriction values. I haven't sorted this out yet, but something you might want to consider. I'm in the middle of this dilemma for my particular setup and don't have an answer yet 
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PSDHokie
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Loc: Whitehall, MD
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Re: Stock air box restriction
#1384482 - 09/14/03 08:52 AM
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For comparison sake, I have measured a max of around 27"H20 with a stock air filter on a stock 02 truck. Same truck, same gauge, with an SP intake runs a max of 15"H20 WOT.
The gauge I am using is one that SP sells that is a ratcheting gauge that measures from 0-30"H20.
Interestingly enough after running my SP Intake on my truck (different then the stock truck above) I have only seen an increase in restriction of 1"H20 after 1-1/2 years and over 60K of use.
Currently I am running a max of 16"H20 and I will change my filter when it hits 20"H20 (or I might think about it around 100k miles of use)
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CarterKraft
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Member
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Member # 27438
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Reged: 12/13/02
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Loc: Ft. Worth Weldon Carter
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Re: Stock air box restriction
#1384987 - 09/14/03 06:49 PM
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I have a 30" filter minder from a CAT wheel loader plumbed into the plastic coupler were the turbo inlet hose and the air filter hose meet. I drilled/tapped the top of this pipe for the minder. Hasn't moved the gauge one millimeter. I'm kinda wondering if larry is right?
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LarryM
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Moderator
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Member # 14468
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Reged: 06/19/01
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Posts: 9550
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Loc: N. Va .. 2 USN FA-18 E/F sons
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Re: Stock air box restriction
#1385044 - 09/14/03 07:39 PM
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Quote:
I have a 30" filter minder from a CAT wheel loader plumbed into the plastic coupler were the turbo inlet hose and the air filter hose meet. I drilled/tapped the top of this pipe for the minder. Hasn't moved the gauge one millimeter. I'm kinda wondering if larry is right?
What is the scale of your filter minder inHg or inH2O. Also, I can't find the exact reference, but location of the measurement point in the air system seems to be critical for proper measurement of air restriction vacuums based on not only THIS POST, but the fact as I remember it that the filterminder for the AIS is "calibrated" for the values in that post. This is why I plumbed mine in at what I think is the Correct point and not what might have been a convenient point in the air intake system. As I've said, I still haven't figured this out yet, but now have a system in place where I can at least tell when to "properly" service my AMSOIL air filters.
Larry
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