MerCruiser 350 MPI Bravo-Ready Sterndrive Marine Engine Package

Description

Repower tired commercial hulls with the MerCruiser 350 MPI Bravo-Ready Marine Engine to restore propulsion output across offshore runs. This 5.7L 90° V8 platform pumps out 300BHP at 5,000 RPM through multiport electronic injection. Raw seawater cooling demands strict seasonal heat exchanger maintenance and zinc replacements in high-salinity harbor slips.

Cast iron forms the foundation through an integrated parent-bore cylinder block mated to Vortec cast iron cylinder heads with 2-Valves per cylinder. The 12V negative-ground electrical system mounts a 65A marine alternator and a high-torque electric starter. Unrigged dry weight registers at 935 lbs with an oil pan holding 1.24 US gal. This engine stance measures 32.0in long by 29.1in wide and 22.0in high to drop into standard sterndrive engine bays.

Key Features of MerCruiser 350 MPI Bravo-Ready

Fleet supervisors buy MerCruiser 350 MPI Bravo-Ready packages to restore dive tender performance without replacing functional outdrive legs. The drop-in architecture integrates with existing transom assemblies to cut drydock repower expenses.

• Multiport electronic injection sprays fuel into intake runners under SmartCraft PCM 09 digital authority.
• The 14in marine flywheel mates with a Bravo engine coupler to transfer rotational power to outdrives.
• A cast iron cylinder block contains 4.00in bore and 3.48in stroke dimensions for heavy duty cycles.
• Thermostatic raw water cooling regulates thermal gradient across the cast iron block under load.
• The 65A alternator charges onboard 12V battery banks and powers critical navigation arrays.
• Cast aluminum marine intake runners balance air distribution across all 8 combustion chambers.
• Vortec combustion chambers optimize flame propagation to meet EPA Marine Tier 3 exhaust standards.

Dynamometer Verification Operational Tolerances

Dynamometer testing verifies 240BHP continuous output at 4,400 RPM and peaks at 300BHP at 5,000 RPM. The 5.7L displacement turns out 350 ft-lbs of shaft torque through intermediate throttle bands. Engine oil pressure stabilizes between 40 PSI and 60 PSI at 4,000 RPM with oil temperatures locked at 195°F. Seawater cooling manifolds sustain water jacket temps at 165°F under full load. Crankshaft journal runout maintains 0.0005in TIR to protect babbit bearings during sustained high-RPM offshore runs.

Field Service Protocol Application Boundaries

Throttle response feels firm on mechanical cable binnacles, requiring 6 lbs of steady actuation effort at the control lever pivot. Marine mechanics must not install this high-RPM gasoline engine in slow steel displacement barges or heavy timber tugs that demand continuous low-end diesel grunt below 1,800 RPM.

• Drain and renew crankcase lube oil every 100 run hours or 12 months using certified marine 4-stroke oil.
• Inspect raw water pump flexible impellers every 100 operating hours to prevent cooling failure.
• Replace sacrificial zinc anodes inside cooling jackets every 6 months to stop galvanic corrosion.

Factory Warranty Crate Contents

Mercury Marine provides 1-Year commercial or 3-Year limited recreational warranty coverage. The factory shipping crate contains the fully assembled 5.7L engine core, Bravo bellhousing, heavy-duty engine coupler, 65A alternator, high-torque starter, SmartCraft sensor harness, remote oil filter kit, and factory documentation manuals.