GASOLINE ENGINE 8.1 S INBOARD MODELS
Page 13 of 58
Continuous Downward Slope From Horizontal
Model
Engine
Installation
Angle*
Minimum Maximum
Down-Angle
Inboard
Fore End
Raised 2°
11°
2-5/16 in. (59 mm)
per 12 in. (305 mm)
21°
4-5/8 in. (117 mm)
per 12 in. (305 mm)
Down-Angle
Inboard
Fore End
Raised 4°
13°
2-3/4 in. (70 mm)
per 12 in. (305 mm)
23°
5-1/16 in. (129 mm)
per 12 in. (305 mm)
Down-Angle
Inboard
Fore End
Lowered 7°
16°
3-7/16 in. (87 mm)
per 12 in. (305 mm)
26°
5-7/8 in. (149 mm)
per 12 in. (305 mm)
V-Drive
Inboard
Fore End
Lowered 2°
7°
1-1/2 in. (38 mm)
per 12 in. (305 mm)
17°
3-11/16 in. (94 mm)
per 12 in. (305 mm)
V-Drive
Inboard
0° 9°
1-7/8 in. (48 mm)
per 12 in. (305 mm)
19°
4-1/8 in. (105 mm)
per 12 in. (305 mm)
V-Drive
Inboard
Fore End
Raised 3°
12°
2-1/2 in. (64 mm)
per 12 in. (305 mm)
22°
4-7/8 in. (124 mm)
per 12 in. (305 mm)
* Fore - End of engine closest to bow of boat.
• The first 18 in. (457 mm) of exhaust hose should drop the specified minimum relative to
horizontal. Thereafter, 3° of drop or 1/2 in. (13 mm) of drop per 12 in. (305 mm) relative to
horizontal is a MINIMUM requirement for the rest of the exhaust system.
• Exhaust hoses should not restrict the flow of discharge water from the elbow. The ex-
haust hose cannot be bent more than 5° relative to the exhaust elbow outlet as a hot spot
in the hose will occur and burn through.
• Exhaust outlet must be above the water line with boat at rest in the water and loaded
to capacity.
• System must not cause excessive back pressure when measured 10 in. (254 mm) aft
of the exhaust elbow outlets. Back pressure MUST NOT exceed 2 psi (14 kPa). Mini-
mum exhaust hose sizes are given in the following chart:
Minimum Exhaust Outlet Hose Size
Model Single Outlet Dual Outlet
ALL 5 in. (127 mm) 4 in. (102 mm)
• Exhaust hoses must be secured at each connection with 2 hose clamps.
• An exhaust resonator is included with all 496 cid / 8.1L engines. Installation of this kit is
required on 496 MAG and 496 MAG HO sterndrive engines with a through the transom
or through the hull exhaust. MerCruiser strongly recommends the use of this kit on all
other models.
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