A New Generation

400R

A word from Mercury Racing

“More low-end torque, more peak horsepower, better fuel economy and full power on 87 octane fuel. The new V10 400R delivers the potent performance and drivability that only Mercury Racing can offer.”

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Jeff Broman

Director of Engineering

5.7L V10 Naturally
Aspirated 400R

Relentless Innovation
Is In Our DNA

Deep-Breathing QC4 Technology

Performance you will feel – instantly. A new naturally aspirated V10 5.7-liter powerhead features the deep-breathing Mercury Racing Quad Cam Four Valve (QC4) design with proprietary 92mm throttle body and tuned intake to maximize airflow and power.

Exclusive 92MM Throttle Body

A proprietary 92mm throttle body and tuned intake work with the QC4 head to maximize airflow and power. The exclusive heavy duty throttle body servo motor is designed to produce instant throttle response, while a Mercury Racing fuel pressure sensor provides precise fueling under acceleration to further enhance throttle response.

Mercury Racing Advanced Midsection

The exclusive Mercury Racing Advanced MidSection (AMS) is engineered meet the demands of high-performance boat operation. It supports and isolates the powerhead from the transom to ensure run quality is smooth and quiet at all speeds.

Optional Tie-Bar

An optional rear tie-bar bracket integral to the Racing AMS provides a strong, ultra-light mounting point for rock-solid precision steering on catamaran and other ultra-high-speed applications.

5.44 HD Gearcase

The Mercury Racing 5.44 HD gearcase option is ideal for heavy bay boats and multi-engine performance center console boats that require a more-submerged gearcase and benefit from added stern lift. It features a 1.60:1 gear ratio.

Sport Master Gearcase

The race-proven Sport Master gearcase is a surface-piercing design intended for boats capable of exceeding 85 mph, and features low water pick-ups and a crescent leading edge to maximize speed and efficiency. It also features a 1.60:1 gear ratio.

Power to the Water

The new Mercury Racing® Ventera™ propeller is designed to handle big outboard horsepower on fast center consoles, day cruisers and bay boats. This 15-inch diameter, four-blade prop was engineered specifically to carry more load with greater efficiency at high speeds and in semi-surfacing installations.

Color us gone. Two striking color choices. For your custom finish we offer a ready-to-paint option.

Facts & Figures

Full Throttle RPM

6000
6600

Rated HP

400

Cylinders

V10

Displacement

5.7L
Horsepower (HP/KW) 400 / 298
WOT RPM 6000-6600
Engine Type V10 (64-degree) with 40-Valve Dual Overhead Cam (DOHC)
Displacement (Liter/CID) 5.7 / 349
Induction System Naturally Aspirated
Fuel Requirements Unleaded Regular 87 Octane Minimum (R+M/2) or 91 RON
Charging (AMP/WATT) 150 / 1890
Throttle & Shift Digital Throttle & Shift
Midsection Racing Advanced Midsection
Integrated Rear Tie Bar Bracket Available
Shaft Lengths (Inch) 20, 25, 30, & 35
Gearcase Sport Master or 5.44″ HD
Gearcase Ratio 1:60:1
Dry Weight (LB/KG) 695 / 315
Warranty 3-Year Limited

87 Octane

Experience thrilling performance and full power on readily available 87 octane (91 RON) fuel. Advanced Range Optimization utilizes electronic sensors to precisely adjust the fuel mixture for the best-possible efficiency at all speeds.

87 octane | preferred marine sales group inc. | preferred marine
Adaptive speed control | preferred marine sales group inc. | preferred marine

Adaptive Speed Control

Adaptive Speed Control maintains engine RPM as load changes due to sea conditions or turning maneuvers to maintain boat authority with less control input.

150 AMP Alternator

A powerful 150 amp alternator and Idle Charge battery management help maintain battery charge on boats rigged with power-hungry electronics and audio.

Alternator | preferred marine sales group inc. | preferred marine

Engine Information and Specifications

Select Horsepower

HP / kW
  • 400 / 298
Engine type
  • V10 (64-degree) with 40-Valve Dual Overhead Cam (DOHC)
Displacement (L)
  • 5.7 / 349
Full throttle RPM
  • 6000-6600
Air induction
  • Naturally Aspirated
Fuel induction system
  • Unleaded Regular 87 Octane Minimum (R+M/2) or 91 RON
Alternator amp / Watt
  • 150 / 1890
Fuel Requirements
  • Unleaded Regular 87 Octane Minimum (R+M/2) or 91 RON
Recommended oil
  • Mercury Racing 25W-50 NMMA Certified FCW 25W-50 Synthetic Blend
Oil Capacity
  • 8.0 Liters
Engine protection operator warning system
  • SmartCraft Engine Guardian

+ See All Specs

Compatible with SmartCraft digital technology
  • Yes
Starting
  • Electric (Turn-key) with SmartStart
Controls
  • SmartCraft Digital
Steering
  • Electro-hydraulic power steering Joystick Piloting for Outboards
Shaft length
  • 20″ / 508 mm
  • 25″ / 635 mm
  • 30″ / 762 mm
  • 35″ / 889 mm
Gearcase ratio
  • 1:60:1
Gearcase
  • Sport Master or 5.44″ HD
Dry weight *Lightest model available
  • 695 lbs / 315 kg
CARB star rating
  • CARB 2-Star
Gearcase options
  • 5.44″
Trim system
  • Power trim and tilt with SmartCraft programmable tilt
Counter Rotation
  • Available in both gearcases
Dry Weight*
  • 695 lbs / 315 kg
Shaft Length
  • 20″ / 508mm
  • 25″ / 635mm
  • 30″ / 762mm
  • 35″ / 889 mm
Alternator AMP
  • 70 AMP / 882 Watt (Belt-Drive)
Color
  • Phantom Black
  • Cold Fusion White
Warranty
  • 3-Year Limited for recreational boating
  • 3-Year Limited Corrosion warranty.

- See Less

Mercury racing v10 400r

The Power of Color Options

Engine Color: White

Mercury racing v10 400r

Engine Color: Black

Mercury racing v10 400r

Engine Color: White

Mercury racing v10 400r

Engine Color: Black

Mercury racing v10 400r

TIME FOR A NEW OUTBOARD MOTOR?

Is your current boat ready for some new power? Don’t wait until your engine is worn out and not working. Today’s marine engines are more reliable than ever. With many outboard options on the market, it can be daunting to determine exactly what engine might be a right fit for your current boat.