GASOLINE ENGINES BRAVO MODELS
Page 18 of 116
EXHAUST RESONATOR
The exhaust resonators (provided with the engine package or available separately) are
designed to provide increased resistance to water ingestion due to the tuning effects of the
exhaust system. Quicksilver resonators are designed to break up the exhaust pulses.
CAUTION
Avoid severe engine damage. Water ingestion by the 454 and 502 cid (7.4L
and 8.2L) engines may occur in some instances without the use of specially
designed exhaust resonators. Install exhaust resonators in the exhaust
system when specified.
IMPORTANT: Exhaust resonators must be installed on 7.4L MPI, 454 Mag MPI and 502
Mag MPI Models of sterndrive engines with through the transom (or through the hull)
exhaust
On 454 and 502 cid (7.4 and 8.2L) sterndrive engines using through the transom or hull
exhaust systems, special care must be exercised in system design and construction to
prevent an adverse tuning effect on engine exhaust output.
Exhaust system tuning can be affected by various factors that are beyond the control of
Mercury MerCruiser. Following are several factors that can affect exhaust system tuning:
• Type and configuration of exhaust outlet.
• Length of exhaust hose.
• Amount of back-pressure in exhaust system.
Exhaust Resonator Kit use on Sterndrive Models:
CAN Be Used With:
CANNOT Be Used With:
1. Transom mounted muffler tips.
2. Waterlift mufflers or other mufflers that
are mounted outboard of exhaust
elbows.
3. Open exhaust.
1. Silent Choice Exhaust System.
2. Below swim platform exhaust.
3. Mufflers that mount between exhaust
elbow and exhaust tip.
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