Air Pre-Cleaners

Air Pre-Cleaners

Air Pre-Cleaners

Air Pre-Cleaners can be utilised in applications where pre-cleaning the intake air is beneficial in reducing component wear, increasing filter life and reducing downtime.

There are 12 different models of air pre-cleaners available to cover your clean air requirements, from 20 to 2000 CFM Heavy duty, non-rusting aluminium and stainless steel construction, yet lightweight, requiring no additional clamps or supports.

It is a fact that even the act of changing the OEM air filters results in a considerable amount of dust passing to the engine. It is also a fact that the air filters are most efficient mid-way through their lives. Not changing the air filters will result in less dust entering the engine, and the most efficient period in the life of an air filter being extended very considerably.

How Air Pre-Cleaners work

Contaminated air enters the pre-cleaner which is installed on the air intake pipe replacing the rain cap or existing housing. It has specially designed and arranged self-cleaning vanes that direct the air to a finely balanced stainless steel impeller. The impeller, which is the only moving part, spins on a sealed bearing and expels heavier than air particles through a louver on the side of the housing. The clean air continues to the standard air filters. As much as 90% of particles over 10 microns will be ejected by the impeller, leaving only a small amount of contaminants for the standard air filter to remove.

The unit is maintenance free and the easy installation features allow for mounting the pre-cleaner in any position, including inverted.

There is no maintenance requirement for the system, and the time consuming task of changing or cleaning air filters is removed from the service schedule.

Air Pre-Cleaners

Benefits of Air Pre-Cleaners

Cuts costly downtime- up to 50% reduction in breakdowns

Reduces maintenance costs-less dirt ingress, protects against premature wear

Extends OEM air filter life up to 12 times, pre-filters 99% of airborne particles

Lifetime Warranty on body, hood and rotor against manufacturing defect or failure

Reduces fuel consumption- cleaner air so fuel burns more efficiently

Reduces engine oil consumption-less contamination in the oil

Protects engine components

Corrosion resistant, durable Aluminium and stainless steel construction

Heavy duty to withstand harsh operating conditions

Aids engine performance, up to 10% recorded

More Details

The pre-cleaner is designed to remove up to 99% of airborne contaminants from the air that feeds the engine. The advantage of removing these contaminants are extended filter life, improved fuel economy, and extended engine life. Turbochargers, blowers, cylinder liners, piston rings and engine oil all suffer failures because of poor air filtration.

Free engine intake air powers the pre-cleaner. Incoming air is drawn through the angled louvre plates, which direct the air to spin the stainless steel rotor which is mounted on precision ground heavy duty bearings. The centrifugal force caused by the spinning motion of the rotor separates the contaminants from the air, throwing them to the inner perimeter of the cover and expelling them from out through the discharge port. The clean air enters through the central port to the OEM air filters.

Calculating Cubic Feet per Meter (C.F.M.)

For all engines, the C.F.M. can be determined using the formula below:

C.I.D. x R.P.M. x Vol. Eff.
(864 * no of cycle engines)

Volumetric Efficiency

(4 Cycle Engines)

Naturally Aspirated Diesel: 0.85
Turbocharged 1.60
Turbocharged - Aftercooled 1.85
up to 2500 r.p.m. 0.80
2500 to 3000 r.p.m. 0.75
3000 to 4000 r.p.m. 0.70

Volumetric Efficiency

(2 Cycle Engines)

Naturally Aspirated Diesel: 1.40
Turbocharged 1.90
Turbocharged - Aftercooled 2.10
up to 2500 r.p.m. 0.85
2500 to 3000 r.p.m. 0.80
3000 to 4000 r.p.m. 0.75


C.I.D: Cubic Inch Displacement
R.P.M: Revolutions Per Minute
Vol. Eff.-Volume Efficiency

To convert Metric Displacements to C.I.D. for use in the formula, use the following conversion factors:

Calculating C.I.D

Displacement in Cubic Centimetres (cm3) x 0.06102
Displacement in Litres x 61.02=C.I.D.

NOTE: Engines equipped with twin air intake pipes, divide the engine C.F.M. by two and apply the correct pre-cleaner to each of the pipes.