Exhaust system
6
General
The expression "wet exhaust line" implies that the
outgoing coolant is taken into the exhaust line for
cooling and silencing purposes.
Complete wet exhaust elbows are offered for most
Vovo Penta engines. In other cases, elbows can be
specially made.
A wet exhaust line is particulary suitable with a flex-
ible mounted engine since it can mostly be made of
oil and heat-resistant rubber exhaust hose. Thus it
would be the most comfortable system for noise re-
duction.
The geometry of the vessels and the engine rooms
varies from spacious volumes to very compact and
tailor-made systems.
Usually the marine engine manufacturers do not
market complete wet exhaust systems. The OEM,
shipyard, boat manufacturers etc. are the ones who
design, chose components and experiment to de-
velop a final exhaust system that complies with all
subsupplier requirements.
The recommendation in this section should be re-
garded as emperical framework and reflects a total
system with maximum length of
10 meters (33') and
maximum 4 x 90° bends.
All systems with silencers, especially the "Aqua-lifts"
contribute to the system's total backpressure. The
contribution of each silencer must be carefully esti-
mated and calculated as well as sea-trialed and veri-
fied by measurements.
NOTE! U.S. federal regulations applicable to U.S.
vessels require the installation of an exhaust sam-
pling port in the exhaust system. See chapter
Gen-
eral under Exhaust system.
Wet exhaust line
Dimensioning the exhaust line
The exhaust line must be dimensioned so as to avoid
harmful backpressure. This is particulary important
in the case of turbocharged engines. Too high back-
pressure means output losses and can cause operat-
ing disturbances like power losses, increased smoke
level and shorter service life. For recommendations
see diagram in chapter
Backpressure.
Exhaust elbow diameter
The table below indicates standard wet exhaust con-
nection diameters. Note that the complete system
might require larger diameters depending on length,
silencer and outlet configuration.
Engine
Volvo Penta standard exhaust
elbow connection diameter
D5
3"/ 68 mm
D7
4"/ 07 mm
D9/D
6"/ 50 mm
D2
8"/ 200 mm
The silencer is fitted in a suitable place as close to
the engine as possible. The silencer should always
be placed lower than the exhaust elbow.
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