AMSOIL now offers Ea Pre-Filters
(EaPF) for racing and off-road
applications. AMSOIL Ea Pre-Filters prevent large particles from
sticking to EaAR and EaAU Filters
and blocking the flow of air.
What Are Pre-Filters?
Ea Pre-Filters fit over the top of
existing air filters. These polyester
mesh bags feature an industrial grade
elastic band at the opening
to ensure the pre-filter does not
Why Use Pre-Filters?
Racers and off-road enthusiasts subject their vehicles to
some of the most severe conditions possible. These vehicles
operate in areas of heavy dirt and mud that gets slung into
every crack and corner, often clogging air filters. AMSOIL Ea
Pre-Filters are designed to keep larger particles from getting
into and clogging the pleats of air filters. When an air filter is
clogged, the engine loses horsepower and, in the case of Ea
Air Filters, the filter must be cleaned. There is no vacuum or
compressed air available on the race track or out in the
swamp, but an Ea Pre-Filter is easily removed and shaken
free of debris in seconds.
AMSOIL Ea Pre-Filters are constructed with woven mesh
that contains uniformly-sized openings. They are oil-free, so
the dirt will not stick to the bag and create a loss of air flow
and horsepower. Several Ea Pre-Filters are treated with a
hydrophobic water repellent process that helps prevent
moisture from damaging air filters. This proprietary process
is done at the mill as the pre-filters are created, not sprayed
on, so there is no loss of air flow. While Ea Pre-Filters are
effective in repelling water, they are not waterproof.
Ea Pre-Filters prevent particles down to 0.005’ from getting
to the air filter without significantly reducing air flow.
Particles larger than 0.005’ generally just fall off the pre-filter.
Will Not Block Air Flow
AMSOIL Ea Pre-Filters will not cause any significant reduction
in air flow. In fact, AMSOIL EaAU and EaAR Filters allow
more air flow than the engine can process, so adding an
EaPF will not prevent a more-than-adequate amount of air
flow from entering the engine.
To clean AMSOIL Ea Pre-Filters, shake off any excess dirt
and, if necessary, soak in soapy water. After soaking, agitate
the EaPF to remove any remaining debris and grime, shake
off any excess water and air-dry. Ea Pre-Filters used in racing
applications should be inspected after every race to
determine whether or not they require cleaning. Ea Pre-Filters used in regular applications should be cleaned every
3,000 to 5,000 miles. AMSOIL Ea Pre-Filters should be
changed every six to 12 months, or as conditions dictate. For
application information, consult the chart below:
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