ISO 5011 Duramax Air Filter Test Report

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http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
http://www.duramax-diesel.com/spicer/index.htm

SCOPE:

This report presents the results of an ISO 5011 test of several air filters designed for the GM Duramax Diesel. The test was independently performed under controlled conditions using a $285,000 machine at Testand Corp of Rhode Island (manufacturer of the machine). Arlen Spicer, a GM Duramax Diesel owner/enthusiast organized the test. Ken an employee of Testand offered to perform the tests at no charge. (These tests typically cost approx $1700.00 per filter). Ken, also a Diesel enthusiast and owner of a Ford Power Stroke Diesel, shared Arlen’s interest in performing an accurate unbiased test of different types and brands of diesel engine air filters. The filters used in the test were purchased retail and donated by Arlen and other individual Duramax Diesel owners. The detailed reports from the test have been compiled and are presented in the following pages. The final pages of this report present the interesting story how and why Arlen organized the test.

ISO 5011 Test:

The ISO 5011 Standard (formerly SAE J726) defines a precise filter test using precision measurements under controlled conditions. Temperature & humidity of the test dust and air used in the test are strictly monitored and controlled. As Arlen learned in attempting his own tests, there are many variables that can adversely affect filter test results. A small temperature change or a small change in humidity can cause the mass of a paper filter to change by several grams. To obtain an accurate measure of filter efficiency, it’s critical to know the EXACT amount of test dust being fed into the filter during the test. By following the ISO 5011 standard, a filter tested in Germany can be compared directly compared to another filter tested 5 years later in Rhode Island. The ISO 5011 filter test data for each filter is contained in two test reports; Capacity-Efficiency and Flow Restriction.

Capacity and Efficiency:

The Capacity and Efficiency test report presents the test results of feeding an initially clean filter with PTI Course Test Dust (dirt) at a constant rate and airflow. The course test dust has a specific distribution of particle sizes ranging from less than 2.5 microns to greater than 80 microns (see table below). Every filter is initially tested at 350 CFM and the Initial Restriction or differential pressure across the filter is recorded in IN-H20 (Inches of Water). The filter is then tested by feeding test dust at a nominal rate of 9.8 grams per minute with a constant airflow of 350 CFM. The test is continued until the flow restriction exceeds the Initial Restriction + 10 IN-H20. At this point the test is terminated and the amount dust passed through the filter - Accumulative Gain - is measured. Dirt passing through the filter is captured in the Test Station’s Post Filter. The exact amount of dirt passed is determined by measuring the before and after weight of the Post Filter. Similarly, the amount of dirt retained by the Filter under test - Accumulative Capacity – is measured by taking the difference between the before and after weights of the Filter. From these results the overall % Efficiency of the filter is calculated. This test also indicates how long a Filter will last before replacement is required (or cleaning for reusable filters).

Flow Restriction:

This report presents flow restriction of a clean filter resulting from an increasing airflow. The differential pressure restriction across the filter is reported in inches of water (IN-H2O) versus Air Flow in cubic feet per minute CFM.

Data from these reports has been compiled and presented in the following bar graphs, Plots and data tables.

Filter Efficiency:

Filter efficiency is a measure of the filters overall ability to capture dirt.

Image002.jpg

Accumulative Capacity:

“Accumulative Capacity” is a measure of dirt holding/loading capacity before reaching the maximum restriction limit - Initial Restriction + 10 IN-H20.

Image004.jpg

Accumulative Gain:

"Accumulative Gain" is the total amount of dirt that passed through the filter during the test.

Image006.jpg
(Note: The Purolator was reported to have a seal malfunction during the test and passed more dirt than it would have with a good seal.)

Initial Restriction:

Initial Restriction is the Filter under test’s resistance to flow at 350 CFM.

Image008.jpg

Dirt Passed Versus Total Test Time

This graph shows each the duration of each filter’s test versus dirt passed (Accumulative Gain).

(Note: The Purolator was reported to have a seal malfunction during the test and passed more dirt than it would have with a good seal.)
Image010.jpg

In the chart above it’s important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt. See the data tables for a complete summary of these comparisons.

Dust Loading:

The dust loading curves show graphically how each filter responded to a constant 9.8 gms/min dust flow before reaching the maximum restriction limit.

Image012.jpg

It’s interesting to note the shape of these Dust Loading Curves. The AC and Baldwin filters each had near linear responses until reaching maximum restriction. Restriction for these filters increased at a constant rate versus the 9.8 gms/min dust feed rate. The other filters, most notably the oiled reusable types, had an exponential loading response before reaching maximum restriction. These filters had a lower initial restriction, but they became exponentially more restrictive under a constant flow of dirt. Also notice the length of the curves as it shows the relative test time for each filter (time to max restriction).

Restriction to Flow:

The Restriction to Flow curves graphically show how each “clean” filter responded to a steadily increasing flow of air up to 350 CFM.

Image014.jpg

The Flow Restriction response curves for each filter have the same basic shape. However, note how the AC Filter, which passed the smallest amount of dirt and had the highest dirt capacity and efficiency, also had the highest relative restriction to flow. The less efficient filters correspondingly had less restriction to flow. This illustrates the apparent trade-offs between optimizing a filter for dirt capturing ability and maximum airflow.

Test Data Tables:

ISO 5011 Capacity & Efficiency

Filter AC Delco A1618C Baldwin PA4134 AFE 73-10062 No Brand X40061 AMSOIL TS123 Purolator A45314 WIX 46678 UNI UAA-103 K&N 33-2135 AFE 72-90008 (fine dust) K&N 33-2135 (fine dust)
Efficiency 99.93 99.72 99.23 99.32 98.63 98.73 99.03 97.93 96.08 92.33 89.85
Dirt Passed, gms 0.40 1.10 1.80 2.40 2.72 5.00 4.40 7.90 6.00 10.90 20.95
Times Dirt Passed Compared to the AC Delco 1 X 3 X 5 X 6 X 7 X 13 X 11 X 20 X 15 X  —
Initial Restriction 6.23 5.71 4.99 4.78 5.88 5.05 5.06 5.4 4.54 2.08 4.67
Accumulative Capacity, gms 573.898 388.154 232.516 350.402 196.323 388.659 447.366 374.638 211.58 131.188 185.436
Dirt Accumualated Compared to the AC Delco, % 100% 68% 41% 61% 34% 68% 78% 65% 37% 23% 32%
Restriction Limit 60 40 24 36 20 40 44 44 20 20 12
Report Date 7/12/2004 7/13/2004 7/12/2004 7/13/2004
Barometric Pressure, inHg 29.68 29.68 29.69 29.69 29.64 29.87 29.94 29.68 29.87 29.57 29.62
Air Flow Setpoint, SCFM 350
Air Flow Type Variable
Relative Humidity, % 63.39% 63.44% 61.95% 57.54% 64.44% 63.48% 57.63% 65.36% 61.92% 63.61% 67.22%
Typ of Dust Course Fine
Batch # 4724C 4444D
Temprature, deg F 74.83 74.84 74.92 74.94 75.59 75.87 75.25 75.02 75.8 75.34 75.39
Dust Feed Rate, gms/Min 9.8

ISO 5011 Filter Test, Flow Restriction

Filter Report
Date
Barometric
Pressure, inHg
Flow,
SCFM
Relative
Humidity, %
Temprature,
deg F
AC Delco A1618C 7/6/2004 30.20 350 46.69% 78.05
Baldwin PA4134 7/6/2004 30.16 350 47.67% 79.19
WIX 46678 7/6/2004 30.17 350 54.16% 74.58
No Brand X40061 7/6/2004 30.21 350 49.19% 77.32
AFE 73-10062 7/6/2004 30.17 350 47.26% 79.1
Purolator A45314 7/6/2004 30.21 350 51.19% 75.68
AMSOIL TS123 7/6/2004 30.20 350 47.78% 77.71
UNI UAA-103 7/6/2004 30.17 350 48.24% 79.09
K&N 33-2135 7/6/2004 30.17 350 48.47% 79.28
USED AC Delco A1618C 7/6/2004 30.18 350 45.63% 78.51
USED UNI UAA-103 7/6/2004 30.18 350 45.73% 78.67
USED K&N 33-2135 7/6/2004 30.19 350 46.31% 78.24
USED, Cleaned &
Re-oiled K&N 33-2135
7/13/2004 29.62 350 67.82% 75.03

Filter Test Data
AC Delco A1618C Flow, SCFM 4.813 140.052 209.869 279.383 350.138 384.591
Rstrn IN-H2O 0.0 0.7 1.2 1.9 2.7 3.1
Baldwin PA4134 Flow, SCFM 4.861 139.936 210.002 279.621 349.817 384.387
Rstrn IN-H2O 0.0 0.6 1.0 1.5 2.2 2.5
WIX 46678 Flow, SCFM 3.675 139.794 209.731 280.688 350.751 383.887
Rstrn IN-H2O 0.0 0.3 0.6 1.0 1.6 1.9
No Brand X40061 Flow, SCFM 4.291 140.080 210.442 280.740 350.195 384.320
Rstrn IN-H2O 0.0 0.3 0.5 0.8 1.3 1.4
AFE 73-10062 Flow, SCFM 4.789 139.974 210.288 279.546 350.239 385.161
Rstrn IN-H2O 0.0 0.3 0.6 1.0 1.5 1.8
Purolator A45314 Flow, SCFM 3.590 139.846 209.807 279.437 349.989 383.978
Rstrn IN-H2O 0.0 0.3 0.6 1.0 1.5 1.7
AMSOIL TS123 Flow, SCFM 4.670 139.968 209.890 280.613 349.575 385.113
Rstrn IN-H2O 0.0 0.4 0.8 1.3 1.9 2.3
UNI UAA-103 Flow, SCFM 4.905 139.998 209.650 280.352 350.319 385.620
Rstrn IN-H2O 0.0 0.4 0.7 1.3 1.9 2.2
K&N 33-2135 Flow, SCFM 5.008 140.137 210.040 280.298 349.240 385.616
Rstrn IN-H2O 0.0 0.2 0.4 0.7 1.0 1.3
USED AC Delco A1618C Flow, SCFM 4.820 140.222 210.205 280.085 350.677 385.629
Rstrn IN-H2O 0.0 1.0 1.8 2.7 3.9 4.5
USED UNI UAA-103 Flow, SCFM 4.797 140.196 209.540 280.303 349.909 385.004
Rstrn IN-H2O 0.0 0.3 0.7 1.2 1.7 1.9
USED K&N 33-2135 Flow, SCFM 4.881 140.255 210.274 280.606 349.685 385.331
Rstrn IN-H2O 0.0 0.2 0.4 0.7 1.1 1.3
USED, Cleaned &
Re-oiled K&N 33-2135
Flow, SCFM 0.075 140.046 209.561 280.435 349.740 385.496
Rstrn IN-H2O 0.0 0.2 0.4 0.7 1.1 1.3

ISO 5011 Capacity & Efficiency Filter Test

Filter Report
Date
Barometric
Pressure,
inHg
Air Flow
Setpoint,
SCFM
Air Flow
Type
Relative
Humidity, %
Typ of
Dust
Batch # Temprature,
deg F
Dust Feed
Rate,
gms/Min
AC Delco A1618C 7/12/2004 29.68 350 Variable 63.39% Course 4724C 74.83 9.8
Baldwin PA4134 7/12/2004 29.68 350 Variable 63.44% Course 4724C 74.84 9.8
No Brand X40061 7/12/2004 29.69 350 Variable 57.54% Course 4724C 74.94 9.8
AFE 73-10062 7/12/2004 29.69 350 Variable 61.95% Course 4724C 74.92 9.8
WIX 46678 7/13/2004 29.94 350 Variable 57.63% Course 4724C 75.25 9.8
Purolator A45314 7/12/2004 29.87 350 Variable 63.48% Course 4724C 75.87 9.8
AMSOIL TS123 7/12/2004 29.64 350 Variable 64.44% Course 4724C 75.59 9.8
UNI UAA-103 7/12/2004 29.68 350 Variable 65.36% Course 4724C 75.02 9.8
K&N 33-2135 7/13/2004 29.87 350 Variable 61.92% Course 4724C 75.8 9.8
AFE 72-90008
(fine dust)
7/13/2004 29.57 350 Variable 63.61% Fine 4444D 75.34 9.8
K&N 33-2135
(fine dust)
7/13/2004 29.62 350 Variable 67.22% Fine 4444D 75.39 9.8

Filter Test Data
Time, Min 0 2 4 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
AC Delco A1618C Rstrn N-H2O 6.23 6.99 7.79 8.47 9.02 9.60 10.16 10.74 11.39 11.98 12.74 13.37 14.20 15.02 15.82 16.83
Dust Fed, gms 0.0 39.5 77.2 115.5 154.3 192.0 231.3 270.2 308.6 347.2 386.3 424.7 463.8 501.5 538.1 574.3
Baldwin PA4134 Rstrn N-H2O 5.71 6.75 7.98 9.17 10.22 11.30 12.36 13.39 14.45 15.37 16.41  —
Dust Fed, gms 0.0 39.1 78.2 117.6 156.5 196.5 235.7 273.5 312.3 350.1 389.3  —
No Brand X40061 Rstrn N-H2O 4.78 4.96 5.15 5.48 6.00 6.96 8.51 10.45 12.64 15.60  —
Dust Fed, gms 0.0 39.3 79.1 118.7 157.7 195.9 235.0 274.1 313.3 352.8  —
AFE 73-10062 Rstrn N-H2O 4.99 5.18 5.60 6.36 7.74 10.09 16.22  —
Dust Fed, gms 0.0 39.2 77.7 116.9 155.4 194.7 234.3  —
WIX 46678 Rstrn N-H2O 5.06 5.14 -0.01 5.12 5.26 5.53 5.79 6.13 6.53 7.07 7.84 8.96 10.53 12.57 15.58
Dust Fed, gms 0.0 20.0 20.2 20.3 59.6 99.2 138.2 177.0 216.6 255.8 294.9 335.0 374.5 413.2 451.8
Purolator A45314 Rstrn N-H2O 5.05 5.24 5.48 5.81 6.31 7.23 8.75 10.35 12.11 14.85 17.85
Dust Fed, gms 0.00 39.9 79.6 119.2 157.4 196.9 236.5 276.4 315.4 354.5 393.7
AMSOIL TS123 Rstrn N-H2O 5.88 6.83 8.59 11.15 14.95 20.27
Dust Fed, gms 0.0 38.5 78.9 119.7 159.4 199.0
UNI UAA-103 Rstrn N-H2O 5.40 5.52 5.75 6.03 6.37 6.85 7.52 8.23 9.64 11.71 14.90 16.87
Dust Fed, gms 0.0 38.9 77.8 117.4 156.2 194.5 232.4 268.9 307.0 340.8 370.2 382.5
K&N 33-2135 Rstrn N-H2O 4.54 4.63 -0.01 4.59 4.76 5.06 5.74 7.72 14.56
Dust Fed, gms 0.0 20.7 20.4 20.4 59.7 100.0 139.6 178.4 218.6
AFE 72-90008
(fine dust)
Rstrn N-H2O 2.08 2.26 2.54 3.02 4.92 14.77
Dust Fed, gms 0.0 42.1 68.8 91.5 114.4 142.1
K&N 33-2135
(fine dust)
Rstrn N-H2O 4.67 4.95 5.45 6.29 9.06 14.23 26.30
Dust Fed, gms 0.0 51.5 89.6 120.9 148.3 174.0 206.4

To be consistent with common industry practice all filters were tested using PTI Course Test Dust. Course dust is more commonly used since it will produce higher % efficiency numbers.

TEST DUST Specifications

micron size  % in Fine  % in Course
0-2.5 19.7 5.3
0-5 37.3 11.5
5-10 18.2 11.6
10-20 17.7 14.9
20-40 16.6 22.4
40-80 9.9 28.7
80+ .4 10.9

The Story behind the test:

First of all, many thanks to Arlen Spicer and Ken at Testand for organizing and facilitating the test. Arlen is a professional Firefighter who also operates a small tree service on the side. The tree service is the reason he owns a diesel truck. This study was the result of nearly a year of work by Arlen to get accurate independent data on air filters for the GM Duramax Diesel. Arlen originally set out to build his own Filter Test Stand so that he could perform accurate, repeatable and independent measurements on the various filters available for the Duramax. Arlen questioned the claims made by aftermarket filter manufacturers that their filters were superior to the conventional OEM style paper filters. After spending many months, hours and a considerable amount of his own money, he learned first hand how difficult it was to perform an accurate air filter test. He found it was difficult to maintain all the necessary controls to insure an accurate measurement. It was at this juncture that Arlen received a call from Ken at Testand offering to perform the ISO 5011 test free of charge. Ken found Arlen’s idea for an independent comparison study very interesting and offered to do the ISO 5011 testing using one of Testand’s industrial Filter Test Machines. Arlen posted the news in an internet forum and immediately the offers by forum members to purchase and send filters for the test started rolling in. Some members purchased and donated filters and others made contributions to cover the expenses and the cost of shipping the filters to Teststand. It was truly a team effort. The end result is the top quality data presented in this report. The following is a quote from a post in the forum.

(Arlen) SPICER wrote,

“Now that I am not doing the tests and my objectivity is not necessary, let me explain my motivation. The reason I started this crusade was that I was seeing people spend a lot of money on aftermarket filters based on the word of a salesperson or based on the misleading, incomplete or outright deceiving information printed on boxes and in sales literature. Gentlemen and Ladies, Marketing and the lure of profit is VERY POWERFUL! It is amazing how many people believe that better airflow = more power! Unless you have modifications out the wazoo, a more porous filter will just dirty your oil! Some will say " I have used aftermarket brand X for XXX # years with no problems. The PROBLEM is you spent a chunk of ching on a product that not only DID NOT increase your horsepower, but also let in a lot of dirt while doing it! Now how much is a lot? ANY MORE THAN NECESSARY is TOO MUCH!
Others are persuaded by the claims of aftermarket manufacturers that their filters filter dirt "better than any other filter on the market." Sounds very enticing. To small timers like you and me, spending $1500 to test a filter sounds like a lot. But if you were a filter manufacturer and you believed your filter could filter dirt better than any other media on the market, wouldn't you want to prove it? Guess what. Test your filter vs. the OE paper. It will cost you $3000 and for that price you will have the data that you can use in your advertisements. Your investment will be returned a thousand fold! EASIER than shooting fish in a barrel! So why don't these manufacturers do this? Hmmm? Probably not because they would feel guilty about taking more market share.
Now I am not saying that ALL aftermarket filters are useless. A paper filter does not do well if directly wetted or muddy. It may collapse. This is why many off-road filters are foam. It is a compromise between filtering efficiency and protection from a collapsed filter. Now how many of our trucks collapse their filters from mud and water? However, if a filter is using "better airflow" as their marketing tool, remember this....Does it flow better? At very high airflow volumes, probably. BUT, Our trucks CAN'T flow that much air unless super-modified, so what is the point? The stock filter will flow MORE THAN ENOUGH AIR to give you ALL THE HORSEPOWER the engine has to give. And this remains true until the filter is dirty enough to trip the air filter life indicator. At that point performance will decline somewhat. Replace the filter and get on with it.
Hopefully the results of this test will do 2 things. Shed some light on the misleading marketing claims of some aftermarket manufacturers and/or give us new insight on products already on the market that are superior to our OE filter. I stand for truth and will eat my words publicly if my statements prove wrong. I appreciate all of the help and support that you members have offered in this project. It would simply be impossible without your help. A huge thanks to Ken at Testand for his willingness to take on this project. I would be spinning my wheels from here to eternity without his help… SPICER”

Our thanks to Arlen and Ken for making the test happen and providing the valuable test results for the benefit of all.

Sept 2004