Turbulence Chamber

Principles of Internal Combustion Engines
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(2) As the injection begins, combustion begins in the precombustion chamber. The

burning of the fuel, combined with the restricted passage to the main combustion

chamber, creates a tremendous amount of pressure in the chamber. The pressure and

the initial combustion cause a superheated fuel charge to enter the main combustion

chamber at a tremendous velocity.

(3) The entering mixture hits the hollowedout piston top, creating turbulence in

the chamber to ensure complete mixing of the fuel charge with the air. This mixing

ensures even and complete combustion. This chamber design will provide

satisfactory performance with low fuel injector pressures and coarse spray

patterns, because a large amount of vaporization takes place in the combustion

chamber. This chamber also is not very susceptible to ignition lag, making it more

suitable for highspeed applications.

d. Turbulence Chamber (figure 36 on the following page). The turbulence chamber

is similar in appearance to the precombustion chamber, but its function is

different. There is very little clearance between the top of the piston and the

head, so that a high percentage of the air between the piston and the cylinder head

is forced into the