Exhaust system
69
General
The expression "wet exhaust line" implies that the
outgoing coolant is taken into the exhaust line for
cooling and silencing purposes.
Volvo Penta offers complete exhaust systems for
these engines.
A wet exhaust line can mostly be made of oil and
heat-resistant rubber exhaust hose. Thus it would be
the most comfortable system when it comes to instal-
lation and noise reduction.
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 mar-
ket complete wet exhaust systems. The OEM, ship-
yard, boat manufacturers etc. are the ones who de-
sign, chose components and experiment to develop a
final exhaust system that complies with all subsuppli-
er requirements.
The recommendation in this section should be regard-
ed as empirical framework and reflects a total system
with maximum length of 10 meters (33') and maxi-
mum 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.
Wet exhaust line
Dimensioning the exhaust line
The exhaust line must be dimensioned to avoid harm-
ful backpressure. This is particulary important in the
case of turbocharged engines. Too high backpressure
means output losses and can cause operating distur-
bances like power losses, increased smoke level and
shorter service life. For recommendations see dia-
gram on page 78.
Exhaust hose diameter
The table below indicates standard wet exhaust con-
nection diameters. Note that the complete system
might require larger diameters depending on length, si-
lencer and outlet configuration.
Hose diameter, internal diameter (
∅∅
∅∅
∅) :
TAMD31/41 89 mm (3½")
TAMD 42WJ 100 mm (4")
KAMD43/44/300 100 mm (4")
∅∅
∅∅
∅
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