INSTALLATION
10
May 2017 / M-GV4 Piccolo for marine applications / EN
1 Exhaust water lock;
4 Goose neck;
Figure 9: Standard exhaust system
2 Exhaust outlet muffler;
5 Through-hull exhaust outlet Ø 40 mm;
3 Exhaust line Ø 40 mm;
6 Water level.
2.9.1
Standard wet exhaust system installation
The Genverter wet exhaust system must remain completely
independent and separate from the exhaust system of any
other engine on board. A water lock prevents the Genverter
from being flooded by cooling water and should be installed as
close to the Genverter as possible. The lock must be large
enough to hold the entire water volume held in the hose from
the top of the goose neck to the water lock. The water lock
must be installed at the lowest point of the exhaust system
(refer to Figure 9, ref. 1). The exhaust hose must have an inner
diameter of 40 mm no less, no more-. The exhaust system must
be installed so that the back pressure inside the exhaust does
not exceed 0,8 psi 60 cm. water pressure (refer to the user’s
manual) and total length up to the outlet or water separator
does not exceed 2,5 m. The exhaust hose descends from the
capsule to the water lock. Then the hose rises maximum lift 120
cm via the "goose neck" to the through-hull exhaust outlet,
situated minimum 50 mm above the water line (refer to
Figure 6, ref. 5). The "goose neck" must be vertical and situated
preferable along the ship’s keel centre line. It is recommended
to install an extra muffler (see Figure 9, ref. 2) close to the
through-hull fitting.
Because of the small gas flow of the small engine
it is very important to keep strictly to the
instructions above. some mufflers and water locks
cause too high back pressure. It is recommended
to use a WhisperPower installation kits or check
the back pressure (refer to the user’s manual).
Too high back pressure causes the system to fill
up with water affecting the outlet valve and valve
seat.
2.9.2
“Super silent" exhaust system
See Figure 10. In order to reduce the noise level of the GV4
Piccolo to a minimum, an option to reduce the exhaust noise
further (especially exhaust water splashing) is an exhaust/water
separator. The exhaust/water separator allows the cooling
water to be ejected through a line separate from the exhaust
fumes and also functions as a goose neck to prevent water from
flooding the engine. The exhaust/water separator is mounted
more than 60 cm above the water level.
See Figure 11. If the through-hull exhaust outlet has to be
mounted far from the GV4 Piccolo, an exhaust/water separator
must definitely be installed. (Total length of the exhaust piping
from Genverter to top of goose neck (water separator) is more
than 2,50 m.) The sea water from the separator must run down
along the shortest possible path to the through-hull outlet.
