Mercury Mercruiser Engines

Marine Tow Sports Inboard 5.7 MPI - 300 hp

The 5.7 MPI Tow Sports inboard is built to deliver knock-out torque with uncompromised reliability. Like all the Multiport Injection (MPI) engines from MerCruiser, the 5.7 MPI is designed to tow skiers and riders all day long on easy–to-find and affordable 87 octane fuel. The 5.7 MPI also delivers a host of friendly features such as remote oil filters, easy oil drain systems and optional single-point water drain systems to maximize your time on and off the water. In addition, the 5.7 MPI is available in an EC, or Emissions Control version, certified to the state of California 4-Star Super-Ultra Low Emissions level. EC models utilize state-of-the-art marine-specific catalytic converters and an ultra-powerful ignition and fuel control system that monitors vital engine systems and environmental inputs, adjusting to consistently produce maximum power with minimum exhaust emissions.

   Mercury Mercruiser Marine Engines Tow Sports Inboard 5.7 MPI - 300 hp


  • ECM 555 fuel and ignition system along with platinum-tipped spark plugs ensure reliable starts and outstanding performance, year after year
  • Dry-joint exhaust eliminates the chance for water to enter engine through leaky gaskets
  • Water-separating fuel filter helps protect fuel system and engine against damage
  • Extra high alternator output at idle to keep batteries going with large amps and water pumps
  • Proven GM cast iron block V8 power for years of reliable operation
  • EDP-coated exhaust elbows resist temperature and corrosion for long life
  • Brass Sea Water pump housing improves life and better resists damage from running dry


  • Two-piece, long-runner intake manifold design improves low and mid-range torque for better acceleration and handling heavy loads
  • HVS Ignition with knock control maximizes power and protects against low quality fuels
  • Low restriction anodized flame arrestor for added horsepower and torque
  • A variety of available high quality hydraulic transmissions allow boat manufacturers to precisely match hull characteristics and boat weight to optimize performance


  • 3-year/300 hour maintenance interval on many periodic service items saves time and money
  • Color-coded service points makes checking fluid levels simple and straightforward
  • Operates on easy to find, less expensive 87 octane fuel
  • No tools required to drain water from engine with blue drain plugs
  • Special ball-joint throttle and shift linkage for easy maintenance and custom adjustments made simple
  • Easy Oil Drain system coupled with convenient remote oil filter location makes oil changes cleaner and makes periodic service simple and less work


  • Multi-Port Fuel Injection provides easy starts, cold or hot, and automatically adjusts for changes in temperature, weather, or altitude for terrific performance in any environment
  • Helm-mounted Audio Warning System works with Engine Guardian to monitor and protect against engine or transmission damage if monitored temperatures or pressures vary from normal range
  • Large 65 Amp alternator provides plenty of power for popular onboard electronics, even at low RPM
  • MPI engines are designed to display engine information on your choice of analog or SmartCraft digitally-driven gages and displays

Power 300 (221 kW)
Full Throttle Range 4600 - 5000 RPM
Displacement 350 CID (5.7L)
Engine Type V8
SmartCraft® Yes
Bore & Stroke 4.00" X 3.48" (101mm X 88mm)
Compression Ratio 9.4:1
Fuel Requirement 87 Octane (R+M)/2
Engine Control System ECM 555 with SmartCraft CAN Capability
Fuel Delivery System Gen II Cool Fuel with Boost Pump
Fuel Injection System Multi-Point Electronic Fuel Injection
Induction System 2-piece long runner intake with 75mm Throttle Body
Ignition System Crank-fired High Voltage Switch w/Knock Control and Platinum Plugs
Charging System 65 Amp/917 Watt Alternator w/Special Pulley Delivering 24 Amps @ Idle
Water Drain System Optional
Exhaust System Iron Manifold with Ceramic Coated Dry-joint Exhaust Elbow
Cooling System Thermostatically Controlled, Raw Water, Brass Sea Water Pump
Accessory Drive System Serpentine Belt
Recommended Engine Oil Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated
Engine Guardian System Low Oil Pressure, High Coolant Temperature, Transmission Temperature, Low Sea Water Pressure, Low Voltage, Over-rev control, Knock Control
Velvet Drive 71C 1.0:1
ZF 45 C 1.0:1
Velvet Drive 72C 1.5:1
Walter V-Drive w/71C 1.46:1
Walter V-Drive w/45C 1.46:1
Dimensions (LxWxH) in 43x30x22
Dimensions (LxWxH) mm 1092x740x559
Weight w/ Velvet Drive (lbs./kg) 813/369

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Bullock Marine offers new & used powerboats as well as performance boat accessories: skater, fountain, eliminator, Mercruiser Mercury Marine (competition - racers & performance propellers, Zero Effort Controls™, K-Plane™ high performance trim tabs, Mercury Racing Trim Indicators™, high performance engines, competition drive, etc.) cigarette boat, welcraft, scarab, donzi boats, catamaran raceboat, high speed twin hull, etc. Bullock Marine is an authorized dealer for Douglas Marine Skater Powerboat, Regy Fountain powerboat & sport boat, Eliminator powerboat & sport boat, and Mercury Mercruiser marine engines, Drive & accessories. Mercury Mercruiser HP 1075 SCi 1075 HP marine engines racing boats Mercury Marine HP 575 SCi 575 HP Sterndrives performance boat Mercruiser HP 525 EFI 525 HP race boat engine for sale powerboats Mercury Mercruiser HP 500 EFI 500 HP stern drives power boat Mercury Marine Scorpion 377 377 HP marine engines high performance boats Mercruiser 496 MAG High Output 425 HP Sterndrives sport boat Mercury Mercruiser 496 MAG 375 HP race boat engine for sale powerboat Mercury Marine MX 6.2 MPI Horizon 320 HP stern drives performance boats Mercruiser MX 6.2 MPI 320 HP marine engines power boats Mercury Mercruiser 350 MAG MPI Horizon 300 HP Sterndrives engines Mercury Marine 350 MAG MPI 300 HP race boat engine for sale mercruiser Mercury Drive Dry-Sump Six drive racing mercruiser powerboats mercury Bravo One XR Sport Master sport boat drives sport boat V SSM drive mercury race power boats III-A SSM drives mercury mercruiser racing boats Bravo One XR drive powerboat Bravo X Diesel mercruiser drives sport boats Bravo XR mercury drive for sale power boats Bravo X drives mercruiser boats Bravo mercury drive sales pleasure Alpha drive mercruiser boat

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