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Home > Ordnance Documents and other related manuals > > Precombustion Chamber
Figure 39. Open Combustion Chamber
Turbulence Chamber - Od162070072

Principles of Gasoline And Diesel Fuel Systems
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PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
b. Precombustion Chamber (figure 40).  The precombustion chamber is an
auxiliary chamber at the top of the cylinder.  It is connected to the main
combustion chamber by a restricted throat or passage.
The precombustion
chamber  conditions  the  fuel  for  final  combustion  in  the  cylinder.
A
hollowed  out  portion  of  the  piston  top  causes  turbulence  in  the  main
combustion chamber as the fuel enters from the precombustion chamber to aid
in  mixing  with  air.
The  following  steps  occur  during  the  combustion
process:
(1) During the compression stroke of the engine, air is forced into
the precompression chamber and, because the air is compressed, it is hot.
At the beginning of injection, the precombustion chamber contains a definite
volume of air.
(2) As the injection begins, combustion starts in the precombustion
chamber.  The burning of the fuel, combined with the restricted passage to
the main combustion chamber, creates a tremendous
FIGURE 40.
PRECOMBUSTION CHAMBER.
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