There are many different types of pre-cleaners available. Most of them use some form of inertial separation process to remove dirt without using a replaceable filter.
Dirt particles are heavier than air and will try to continue traveling in the same direction even if the air flow is made to change direction. Effectively, the flow of dirt splits from the flow of air. The heavier the particle, the more effective this process is.
Yes. Apart from the different types of pre-cleaners, all pre-cleaners need the air flow to be moving at a reasonable speed for the separation process to work effectively. If the pre-cleaner is too large for the engine’s air flow, the air will not be traveling quickly enough for the dirt to separate. The dirt will stay mixed with the incoming air. If it is too small, the level of restriction of the intake system will be too high for the engine.
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