July 2005 / MOBILE WHISPER 3,5 / EN 11
Figure 19. Ways to prevent water to get in
A negative feature of a dry exhaust system is the heat
radiated by its components.
Measures are taken to overcome the heat problem: The
exhaust bent to bring the exhaust out of the canopy is
cooled by water. Insulation blankets are included in the
exhaust kit to insulate the flexible bellow and the first
muffler.
When a dry exhaust has its outlet on the roof, all the
pipes inside the vehicle has to be insulated.
The exhaust pipes will be very hot and all
accessible pipes and mufflers are
dangerous to people when not insulated.
There are companies that are specialised in insulating
hot pipes and fancy systems are available to make it
good looking. However it is also possible to do it yourself
by winding fibreglass or rockwool around the pipes and
seal it with aluminium tape.
2 THE STANDARD DRY EXHAUST SYSTEM
The standard exhaust system contains:
On the generator set:
A water-cooled exhaust bent
In the exhaust installation kit:
A stainless steel shielded flexible bellow.
One resonance muffler
One absorption muffler
Clamps and rubbers to mount the system flexible
Fittings, bents and pipes to make the different
connections
Blankets for thermal and sound insulation.
The mufflers are high quality industrial mufflers that are
much more effective, robust and durable than mufflers
made for automotive use.
3. INSTALLATION OF THE EXHAUST
Before determining the location of the generator set one
has to consider how to get away with the exhaust. Often
one can find space below the vehicle between the
chassis to mount the mufflers. The outlet should blow the
fumes away from the doors to avoid a nasty smell. When
the gasses are in the flow of air blowing from the
radiators this will help to avoid the fumes to be noticed.
Under no condition the fumes should be sucked into the
flow of air into the radiators. In wind still conditions a light
smell of exhaust fumes around the vehicle will not be
avoidable.
To bring the exhaust to the top of the vehicle gives the
best results on noise and smell. However when the pipes
go through the vehicle they should be insulated and
around the hole in the roof should be a collar to prevent
rainwater to leak in. Both mufflers could be on the roof or
one of them or both could be below the vehicle.
In general it is better to have the mufflers wide apart: the
resonance muffler close to the generator and the
absorption muffler on the end of the line. A short pipe
(30cm) should be on the far end after the absorption
muffler. The absorption muffler has no flow direction and
could be mounted both ways. The resonance muffler
should be mounted according to the indication on the
muffler itself.
The resonance muffler should be fitted
according to direction of the gas flow
indicated.
In the kit are clamps to mount the exhaust pipes to
stainless steel bars. These bars should be mounted to
the chassis of the vehicle. It is recommend to use rubber
mountings whenever possible. However take care that
the heat conducted through the brackets will not affect
the rubber. Refer to figure 20 how to mount the rubber in
a safe way. When any doubt an extra safe guard could
be constructed from steel wire or chain.
Figure 20. Mounting bracket in rubber with safe guard
INSTALLATION
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