GASOLINE ENGINES BRAVO MODELS
Page 12 of 116
Combustion Air Requirements
Engine compartments with natural draft ventilation must have vent openings of sufficient
size and location to accomplish the tasks previously outlined.
IMPORTANT: The size of ventilation openings must be increased if any auxiliary
equipment is located in the engine compartment.
The combustion air requirement (per engine) for the specified engines at Wide Open
Throttle are given in the chart below:
Combustion Air Requirements (Per Engine) and Ventilation Information
Model
Engine Air
Requirements
at W O T
MINIMUM
Combustion Air Vent
Area Per Engine
1
Engine Physical
Volume
3.0L
251 ft.
3
/Min.
(0.118 m
3
/sec.)
25 in
2
(161 cm
2
) 2.4 ft.
3
(68.0 l)
4.3L
4.3LH
4.3L EFI
364 ft.
3
/Min.
(0.172m
3
/sec.)
36 in
2
(232 cm
2
)
4.6 ft.
3
(130.3 l)
5.0L
5.0L EFI
424 ft.
3
/Min
(0.200 m
3
/sec.)
42 in
2
(271 cm
2
)
5.0 ft.
3
(141.6 l)
5.7L
5.7L EFI
486 ft.
3
/Min.
(0.229 m
3
/sec.)
49 in
2
(316 cm
2
)
5.0 ft.
3
(141.6 l)
350 Mag MPI
506 ft.
3
/Min.
(0.239 m
3
/sec.)
51 in
2
(329 cm
2
)
5.8 ft.
3
(164 l)
MX6.2L MPI
545 ft.
3
/Min.
(0.257 m
3
/sec.)
55 in
2
(355 cm
2
)
5.8 ft.
3
( 164 l)
454 Mag MPI
7.4L MPI
657 ft.
3
/Min.
(0.310 m
3
/sec.)
66 in
2
(426 cm
2
)
6.0 ft.
3
(170 l)
502 Mag MPI
726 ft.
3
/Min.
(0.342m
3
/sec.)
73 in
2
(471 cm
2
)
6.0 ft.
3
(170 l)
1
: For engine combustion air only - NOT total engine compartment ventilation requirement.
IMPORTANT: The amount of vent area required, according to boating standards
(NMMA, ABYC, etc.) and Coast Guard regulations, for complete (total) engine
compartment ventilation must include the engine combustion air vent area plus the
engine compartment ventilation requirements.
The pressure differential between outside and inside the engine compartment must not
exceed the following value.
Maximum Pressure Differential at Wide Open Throttle
2 in. (51 mm) of water (measured with a manometer)
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