Perkins M190C, Installation Manual

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N40475 Chapter 4
Page 13
Silencers
In some applications a reduction in noise levels from
the exhaust would be desirable and to that extent, a
silencer can be fitted.
The exhaust system ejects the cooling water as
well as silencing the engine’s combustion noise and
removing the exhaust gases. The system must create
minimal restriction to the flow of exhaust gases, known
as back pressure, or the engine may be damaged.
Figure 7 shows an engine sited well above the
waterline (1), with a gradient steeper than 5
O
to the
back of the boat. The water will run naturally down the
exhaust to the stern. To reduce noise a straightforward
in-line silencer (2) should be used.
Note: The above is used in relation to 15kPa.
Figure 7