Exhaust System
Page 6A-8 90-863758060 AUGUST 2006
• Exhaust back pressure must meet the required specification. (See Exhaust Back
Pressure Test)
Models Exhaust Back Pressure
All gasoline powered engines
1 psi (7 kPa) Minimum
2 psi (14 kPa) Optimal
11 psi (76 kPa) Maximum
IMPORTANT: Exhaust collectors must drain sufficiently during engine shutdown and idle
to provide the drainage necessary for these operational conditions. Use the following
specifications when designing the collector.
Collector Inlet and Outlet Specifications
1. The inlet hose for the collector must be placed above and within 180° of the horizontal
centerline of the collector.
2. The outlet hose of the collector must be placed below the horizontal centerline of the
collector and within 90° of the vertical centerline of the collector.
a
b
d
e
c
f
15540
a - Collector
b - Vertical center line
c - Horizontal center line
d - Inlet side of collector
e - 90° range for placement of collector
outlet
f - 180° above horizontal centerline
In‑line Muffler
a
b
e
c
d
g
i
f
h
15541
Typical single engine inboard without water standing in muffler
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