20
Superior
Technology
The combustion system
In Volkswagen Marine boat engines, the fuel is
injected directly into the main combustion
chamber.
The advantages include:
• More efficient combustion
• Improved fuel utilization
• Lower fuel consumption and
• Low pollutant emission
The special design of the pistons, injection
nozzles and of the intake port optimises the
combustion process with regard to noise
development, smooth operation and pollutant
emissions.
Intake swirl port
The special design of the intake port induces a
swirling motion in the drawn-in air.
Piston recess
The swirling motion of the intake air is continued
in the piston recess that is optimally adapted to
this engine.
Injection nozzle
The five-hole injection nozzle (fuel injector) injects
the fuel in two stages into the piston recess where
it ignites on the hot air.
The two-stage injection prevents a "harsh"
increase in pressure thus avoiding the
characteristic diesel "knock".
Combustion system
MSSP_001_016
Summary of Contents for SDI 55-5
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