Pre-chamber
Pre-chamber, also referred to as indirect-injection, is one of
the combustion chamber shapes used in diesel engines.
This type is provided with, in addition to the main combustion
chamber, a combustion chamber referred to as a pre-chamber
(pre-combustion chamber, swirl chamber), and the two chambers
are connected by a narrow passage.
Fuel is injected into the pre-chamber, and, while igniting,
combusting, and expanding, flows into the main combustion
chamber together with uncombusted gas, were it combusts
further.
With the swirl-chamber, when air inside the cylinder is sent to
the pre-chamber (swirl chamber) on the compression stroke,
strong swirling is generated, which rapidly mixes the injected
fuel and air, allowing combustion to be performed quickly.
Accordingly, it is capable of faster rotation and has a lower
fuel consumption rate than normal pre-combustion chambers.
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