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Next, let's look at AIR
Air is required to provide the oxygen needed for
combustion, and the engine also needs a sufficient
amount of air, for compression to be adequate.
In small engines there are only two area that can restrict
the flow of air into the engine.
First is the throttle plate in the carburetor or intake
manifold in fuel injected engines.
The other location is the air filter. This can be an air
restriction point if not properly maintained.
The primary function of an air filter is to deliver both high
airflow and dirt protection.
Both air flow and dirt protection are critical to engine
performance.
The basic types of air filters are.
Oiled‐foam, this is a foam type material which is oiled to
capture dirt particles and keeps them from entering the
engine.
These types of filters are normally cleaned and re‐oiled as
a maintenance procedure
Paper type filters used a pleated paper element with
holes of a specific size designed to capture dirt particles
also of a specific size.
These can also be cleaned as a maintenance procedure.
Dual‐element filters are a combination of both types.
They consist of a paper element covered by an oiled‐foam
element.
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