If you want to improve engine performance and economy, reduce engine wear and increase engine life then you need a Unifilter from 4WD Systems.
Unifilter uses an open cell foam which is 3-5% product and 95-97% void space. This open cell structure allows air to be pulled through the foam with 40-60% less effort than conventional paper filters. Sticky filter oil (Filter Fix) which is applied to the filter foam catches all dust particles above 4 or 5 micron. Standard paper filters allow particles of 35 microns or smaller to pass into the motor.
The advantage does not finish there – Unifilter elements are re-useable – at around the normal life of a paper cleaner, Unifilter elements can be washed out with minerals turpentine, re-oiled with “Filter Fix” and returned to the vehicle. Economically and environmentally – a great concept!
| Comparison with paper air filter elements. | |||
| Criteria | Paper | Unifilter | Summary |
| Air flow | Fairly restrictive | 40-60% less restriction | economy & performance |
| Dust retention | 35-40 micron | 4-5 micron | Increased engine life |
| Cost | Aftermarket – cheap Genuine – $$$ | Between $70 -$100 | Save $$ by washing & re-using Unifilter |
| Life expectancy | 10-20000 km | Life of vehicle | Long term |
UniFilters work on the most basic principal known to man – that is, man’s own air filter – the human nose.
How a UniFilter works is the same explanation used to describe the workings of that thing just below and between your eyes. What we have is a wet/sticky passage that allows the air to flow freely with the fluid catching the airborne particles as they try to find their way to where they will do the most damage.
To be technical about it – to reproduce the nose passage UniFilter uses an open cell foam which is 3% to 5% product and 95% to 97% void space. This open cell structure allows air to be pulled through the foam with 40% to 60% less effort than conventional paper cleaners.
Sticky filter oil than comes into play – UniFilters “Filter Fix” filter oil is a heavy weight mineral oil mixed with non drying glue agents. (Mineral oil is used in preference to synthetics as mineral oil will not “dry” or effect the cell structure of the foam.) This mix of oil is very important for good filtration – as it must be liquid enough to travel and meet the dust as it builds up on the surface of the foam and thick enough so as not to drain from the foam. The formulation of “Filter Fix” has taken many years to perfect, since 1976 there has been several improvements, on each occasion some two years of field testing has occurred prior to acceptance of that formula – the present formula is simply the best on the market.
So to compare a UniFilter with a conventional paper air filter, as mentioned, for less effort is requited to pull air throught the filter – giving a performance increase particularly when it comes to fuel saving (better air flow or what should be stated – less vacuum – resulting in smoother running and therefore less fuel being sucked into the system). Dust retention wise, a paper filter is in fact a sieve which must have holes large enough to allow air to pass through. That hole size will allow dust particles of 35 to 40 micron to pass – UniFilter’ sticky oil catches everything above 4 to 5 micron. Given that engine wear is caused by dust particles larger than 15 micron – UniFilter air filters are way out in front when it comes to dust retention.
The advantage does not finish there – UniFilter elements are re-useable – at around the normal life of a paper cleaner, UniFilter elements can be washed out with mineral turpentine, re-oiled with “Filter Fix” and returned to the vehicle. Economically and Environmentally – a great concept.
