GASOLINE ENGINES BRAVO MODELS
Page 4 of 116
MCM 454 & 502 MPI Application Recommendations
BOAT TYPES
The MCM 454 and 502 MPI models are recommended for use in most sport boat applica-
tions with the exception of the following.
• Bravo applications which require that the sterndrive unit be mounted more than 3 in.
(75mm) above the standard “X” dimension (i.e., catamarans, certain stepped bottom
boats, etc.). For those applications, we recommend our Performance Products models
with a Super Speedmaster sterndrive unit which are designed specifically for surfaced
propeller operation.
• Applications which require other than standard Quicksilver propellers to get the boat up
on plane or to keep the propeller from ventilating when up on plane.
• Boats that require that the engine be run above 3200 rpm to keep them on plane.
• Racing applications or other highly abusive applications where the boat and the stern-
drive units will come out of the water frequently. These, again, are applications where
we recommend our Performance Products models with Super Speedmaster sterndrive
units.
STEERING
Mercury MerCruiser power packages come standard with Mercury MerCruiser’s internal
power steering. This durable system provides precise effortless steering control and is rec-
ommended for most sport boat applications. On certain applications, however, Mercury
MerCruiser recommends the use of an external power steering system where the power
steering cylinders connect directly to the sterndrive unit on the outside of the boat. This ar-
rangement gives additional support for even tighter, more firm steering control, and is rec-
ommended for the following applications:
• High speed single or twin engine applications and/or boats with unusual handling char-
acteristics. It is virtually impossible to give a specific recommendation as to when exter-
nal power steering should be used, as this varies from boat design to boat design. Gen-
erally speaking, it is recommended to use external power steering on boats which run
in excess of 70 MPH. However, there are boats which run 60 MPH that would benefit
from the use of external power steering. Because of the many variables involved, the
final decision as to whether or not external power steering is required rests with the boat
manufacturer and must be made after a thorough test and evaluation of each specific
boat. If there is any question whether or not external power steering is necessary, Mer-
cury MerCruiser recommends that it be installed.
• Any Hi-Performance sport boat powered by three or more engines.
• Offshore boats or other applications where the boat and sterndrive units may come out
of the water occasionally.
• All III SSM and V SSM High Performance Sterndrive applications.
External power steering systems are generally either mechanical cable actuated or hydrau-
lic actuated. If cable actuation is selected, combining dual steering cables with an internal
control valve kit (Part Number 89645A35) will provide an even tighter feel (less steering
backlash). This kit cannot be used with hydraulic actuation.
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