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How does AMSOIL, Oil-Wetted Gauze and Paper
Air Filters Compare in Industry Standard Testing?
AMSOIL 2-Stage Air
Foam Air Filter outperforms both high quality paper filter, low
quality paper filters and oil-wetted gauze filters in the SAE
J726C Test Method which tests for air flow, dirt removal and
Here's a more detailed test procedure and conclusive results
covering AMSOIL vs. oil wetted gauze and paper air filters
according to the Industry Standard Society of Automotive
Engineers (SAE) test standard SAE J726.
Your car's engine "inhales" air that is mixed with fuel for
combustion. But air contains an incredible amount of suspended
dirt - typically 400 tons of it in a cubic mile. Much of this is
microscopic dirt, extremely abrasive, that can cause serious
damage inside the engine. Consequently, an air filter is a
necessity. It provides an engine's first line of defense against
An air cleaner must not only trap as much grit as possible, but
it should do so without "smothering" the engine, restricting its
vital airflow. Thus the most desirable performance
characteristics for an air cleaning device are high
dirt-trapping efficiency, and minimal airflow restriction as the
The Society of Automotive Engineers Test Code J726 specifies the
procedures, conditions, equipment, and report format which air
filters can be uniformly compared. A standardized dust
contaminant is introduced into a specially designed testing
apparatus at a controlled rate. Most of the dust will be trapped
in the filter undergoing the test; the remainder is captured in
an "absolute filter".
The air pressure upstream and downstream of the test unit is
monitored. The test terminates when the pressure differential
causes a predetermined amount of fluid displacement on a water
manometer. By quantifying and comparing weights, pressures, and
elapsed time, the experimenter can determine a filters
efficiency, capacity and airflow-based life expectancy.
Our J726 trials were conducted at an independent testing
facility in the upper midwest. The tests compared Motorvator,
K&N, Accel, Fram, and AMSOIL products. The results? AMSOIL
proved vastly superior to the competitors' air cleaners as the
only air filter to consistently score high marks in all three
vital areas of airflow, efficiency and capacity.
The AMSOIL 2-Stage Air Filter traps airborne dust with 99%
efficiency; it holds an incredible 281 grams of contaminant
(that's over half a pound); and it outlasts the competition. It
performs two to four times longer than the others. That's why
AMSOIL can confidently recommend a 25,000 mile/1-year service
life. And the 2-Stage is actually re-usable, with proper
cleaning and re-oiling.
How does AMSOIL do it? Two different densities of lightly oiled
polyurethane foam surrounding an expanded metal cage, precisely
assembled by careful craftsman in AMSOIL's own manufacturing
plant- that's how!
on AMSOIL TS52, K&N 1690 & AC
Performed by Jim Bigley, author of The Diesel Page Website
Jim Bigley put the AMSOIL
Two-stage Air Filter to side-by-side testing with two other
popular air filters. Bigley tested a K&N #1690 oiled gauze
performance filter, an AC A644C paper filter with an oiled foam
wrap and the AMSOIL TS-52. All three filters were tested as
"I'm impressed," Bigley told independent AMSOIL Dealer of Idaho.
Bigley collected a road dust sample and treated it to
pulverizing and grain sorting processes used in geological
sample preparation. He tested each filter with a mixture of road
dust grain sizes: four ounces with grain size smaller than
0.0049 inches, one ounce with grain size between 0.0049 inches
and 0.0082 inches, and less than one ounce with grain size
between 0.0082 inches and 0.0098 inches.
Bigley used a vacuum assembly, rated at 540 CFM, to pull air
through the airbag. To test filtering efficiency, he coated
three 4" X 4" ceramic plates with a very sticky tack oil and
placed the plates inside the airbox on top of the fan cage so
they could trap the particles that passed through the filter. He
photographed each plate after test end.
Bigley reports, "K&N came in dead last in this test as expected.
I expected the AC filter to do the best in the filtering
efficiency test, but it came in just slightly (emphasis Bigley's)
ahead of the K&N. Before testing the AC I didn't think anything
could get through it, especially with (its) oiled foam wrap. The
AMSOIL filter surprised me by winning this contest by a big
margin. The advertising claim on the AMSOIL box which says,
'Proven Best for Removing Airborne Dirt' is no idle claim."
In his conclusion
, Bigley reports, "From a filtering efficiency
standpoint, the AMSOIL oiled foam filter element will protect
your engine better than the other two style filters tested. No
doubt about it."
Back to Air Filtration Index
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