TowSport Inboards

MerCruiser TowSport Inboard engines provide the perfect pulling power with the right amount of torque.

SmartCraft technology gives you Engine Guardian, optimal fuel economy and superior performance thanks to the computer-controlled multiport technology.

You get peace of mind knowing that MerCruiser TowSport Inboards engines are backed by the ultimate support team - Mercury's dealer network.

Perfect torque

An engine's rated horsepower does not necessarily mean it is available when you need it for tow sports. MerCruiser TowSport Inboards engines lead the way in providing high-displacement crankshaft stroke and cylinder block designs to deliver the maximum horsepower at the common rpm range required for towing wakeboarders or skiers.

Efficient and reliable

MerCruiser's TowSport Inboards engines feature cutting-edge multiport fuel injection systems, which precisely outline the exact amount of fuel for all driving conditions. MPI technology features smooth and stable idling, better throttle response, increased fuel efficiency and a reduced cost of operations over the long haul.

Perfect launches

SmartTow* and SmartTow Pro technology ensures the perfect launch every time. Just press the buttons, open the throttle and let SmartTow do the hard work. SmartTow features include launch control, cruise control, five pre-set launches, a unique monitor and SmartCraft engine monitor.

* SmartTow is only available with DTS engines.

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5.7 MPI ECT Specifications

HP/kW 315 / 235
Full throttle RPM 4600-5000
Cylinder Configuration V-8
Displacement (CID / L) 350 CID / 5.7 L
Compression Ratio 9.4:1
Bore and Stroke (in / mm) 4.00 x 3.48in
101 x 88mm
Alternator Amp 65 amp / 917 watt
Cooling Systems Brass sea water pump
Raw water
Thermostatically controlled
Water Drain Systems Three-point manual
Recommended Oil Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMA FC-W rated
Recommended Fuel 87 octane / up to 10% ethanol
Engine Guardian System High coolant temperature
Knock control
Low oil pressure
Low sea water pressure
Low voltage
Over-rev
Fuel Injection Systems Multi-point Electronic Fuel Injection (MPI)
Emissions Control Technology Yes*
Boat Types Tow Sports/Ski Boat

Non-catalyzed 5.7 4-barrel and 5.7 MPI models available for select international markets. Consult your local dealer for availability and specifications.

Non-catalyzed Scorpion 350 and Scorpion 377 models available for select international markets. Consult your local dealer for availability and specifications.

TowSport Inboards Resources

Buy the Books

You can order all available Mercury literature online or through any authorized Mercury dealer. Please have your outboard or sterndrive serial number before placing the order.

  • Operation, Maintenance and Warranty Manuals
  • Parts Manual
  • Service Manual
Purchase a Manual
Installation Drawings

Installation drawings are technical documents, detailing the dimensions of the engines to facilitate installation in new or repowered boats.

Installation Drawings
Sustainability Report Fuel Care