Primary chamber
Primary chamber, also referred to as direct-injection, is one of
the combustion chamber shapes used in diesel engines.
This type has a single combustion chamber (cavity) between the
cylinder head and the piston head into which fuel is injected
directly.
In order to generate a strong swirling motion (referred to as a
swirl) in the charge air and promote the mixing of the injected
fuel with air, the intake air port has been given a spiral
shape.
Generally, direct fuel-injection diesel engines have the
following features.
· Good startability.
· Low fuel consumption rates.
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