Exhaust system
74
Exhaust outlet - through-hull
fittings
The through-hull fittings are placed at a suitable point
above the waterline with a loaded boat. If the through-
hull fitting opens below the water-line a shut-off valve
must be installed at the outlet, or a rigid pipe connect-
ed.
This type of outlet is a kind of standard component
and should not be located at flat transoms. See
"Wagon-back effect"
on page 68.
Exhaust riser
WL
When distance between water level and lowest part of
exhaust elbow is less than 350 mm (14"), or recom-
mended exhaust line inclination can not be acieved an
exhaust riser should be fitted.
Minimum inclination of the exhaust riser outlet should
be 15°.
Maximum increase of height (A) at min. inclination 15°
compare with the standard exhaust elbow is approx.
135 mm (5.3").
Risers suitable to 89 mm (3.5") and 100 mm (4") ex-
haust elbows are available from Volvo Penta.
Min. 15°
A
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