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Engine Information and Specifications

Select Horsepower

  •  350

    Engine Details

    The inherently balanced in-line six-cylinder engine and our Advanced Mid Section (AMS) with perimeter mounts virtually eliminate vibration in the boat. Perfect for sneaking up on fish or cruising on luxury pontoons.

    Specifications - 350

    HP / kW
    • 350 / 257
    Engine type
    • Inline 6
    Displacement (L)
    • 2.6
    Full throttle RPM
    • 5800-6400
    Air induction
    • Supercharged with charge air cooling and electronic boost pressure control
    Fuel induction system
    • Sequential multi-port electronic fuel injection (EFI)
    Alternator amp / Watt
    • 70 amp / 882 watt (Belt-Driven)
    Recommended fuel
    • Unleaded Regular 89 Octane Minimum (R+M)/2 or 93 RON Unleaded 91 Octane or 95 RON for premium performance in all conditions 10% Ethanol Maximum
    Recommended oil
    • Mercury FourStroke 25W40 Marine Oil
    Engine protection operator warning system
    • SmartCraft Engine Guardian
  •  300

    Engine Details

    The smooth, refined power of a 4.6-liter V-8 powerhead delivers exhilarating acceleration and top speed to run offshore with confidence, with generous displacement and robust design that provide uncompromising durability and reliability. The Mercury exclusive Advanced MidSection (AMS) and under-cowl noise management features set the standard for smooth, quiet marine propulsion

    Specifications - 300

    HP / kW
    • 300 / 224
    Engine type
    • V-8
    MidSection
    • Advanced MidSection (AMS)
    Displacement (CID/CC)
    • 279 CID
    Displacement (L)
    • 4.6L
    Cylinder Configuration
    • V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
    Full throttle RPM
    • 5200-6000
    Air induction
    • Performance-Tuned Long-Runner Intake Manifold
    Fuel induction system
    • Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization
    Alternator amp / Watt
    • 115-amp (1449 Watt) with Idle Charge
  •  250

    Engine Details

    The smooth, refined power of a 4.6-liter V-8 powerhead delivers exhilarating acceleration and top speed to run offshore with confidence, with generous displacement and robust design that provide uncompromising durability and reliability. The Mercury exclusive Advanced MidSection (AMS) and under-cowl noise management features set the standard for smooth, quiet marine propulsion

    Specifications - 250

    HP / kW
    • 250 / 186
    Engine type
    • V-8
    MidSection
    • Advanced MidSection (AMS)
    Displacement (CID/CC)
    • 279 CID
    Displacement (L)
    • 4.6L
    Cylinder Configuration
    • V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
    Full throttle RPM
    • 5200-6000
    Air induction
    • Performance-Tuned Long-Runner Intake Manifold
    Fuel induction system
    • Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization
    Alternator amp / Watt
    • 115-amp (1449 Watt) with Idle Charge
Joystick Piloting for Outboards

Joystick Piloting for Outboards

Full 360-degree control. Right at your fingertips. Joystick Piloting for Outboards allows you to move sideways, diagonally or spin the boat on its own axis. Dock in close quarters without being concerned about wind or current. Easily load the boat on a trailer – using only your fingertips. See How Easy It Can Be

Making Boating Easier and Safer

Making Boating Easier and Safer

Mercury Marine’s Active Trim has been providing a “wow” factor, impressing the most seasoned boaters.

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Brochures
Brochures

Take a deeper dive into what makes Mercury outboards stand apart with detailed information on each motor and the features that make them unique.

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