As indicated above, the exhaust first enters the system
at the top of the main dump chamber. The dump chamber is
like a sea chest. It provides an expansion area for the
exhaust causing it to decelerate. As the exhaust fills this
expansion area it is directed into a smaller secondary chamber.
This secondary chamber holds water to help breakup the sound
pulsations of the exhaust. From the secondary chamber the
exhaust flows through our low-speed bypass pipe. This pipe
is sized for low-speed and idle operations. The low-speed
bypass accelerates the exhaust some 4 to 5 times faster
than the main engine exhaust, shooting the smoke, soot and
fumes from the aft port and starboard corners - away from
the boat. At the bottom of the Exhaust Thrust Chamber there
is an opening. In front of that opening there is a wedge
that protrudes below the hull bottom. The wedge is designed
to direct the water downward immediately before it reaches
the exit point (exhaust thrust slot) and as it flows across
and under the exit point, creating a vacuum, pulling water
and smoke from the exhaust system. This suction reduces
engine backpressure. The amount of suction increases with
the faster and faster water flow across the exit point.
When up on plane, a tremendous vulume of water is being
pulled from the system. Your engine will no longer need
to waste fuel and energy expelling exhaust from the system,
adding up to not only fuel costs savings but reduction in
engine wear.
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