67
General
Exhaust systems for marine engines can be divided
in two categories :
• Wet exhaust line
• Dry exhaust line, insulated
Most of the boats/vessels in Volvo Penta power
range with inboard engines are equipped with wet ex-
haust systems. Water is injected into the system to
cool the exhaust gas and the water passes out to-
gether with the exhaust.
A wet system has several advantages compared with
a dry system. The water lowers the exhaust tempera-
ture considerably after the point where the water is
fed into the system, enough to permit the use of a
flexible rubber hose. A flexible hose is usually easier
to install than pipes, is not affected by corrosion or
stress and absorbs the vibration from a flexibly
mounted engine. A wet exhaust system does not
need insulation either and radiates less heat.
The importance of using a wet exhaust is to make a
proper design and make sure the coolant cannot enter
backwards into the engine.
IMPORTANT! The exhaust system should be
designed and installed in such a way that the
exhaust emissions are taken out of the boat
without any harmful backpressure for the engine
and so that there is no risk of overheating any
adjacent parts of the boat. The demand for si-
lencing must also be met and the system ar-
ranged in such a way as to prevent the exhaust
fumes from entering the boat. All exhaust sys-
tems must be installed in such a way that water
cannot force its way back into the engine when
the engine has been switched off.
When designing the exhaust system, note that
the backpressure must not exceed the values in
the table on page 78.
NOTE! Local regulations regarding sound levels may
apply. This has to be considered when designing the
exhaust system.
Exhaust system
Wet exhaust system
Dry exhaust system
To Next Page
Loading...
Need help?
General
