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.”
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
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.
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.
Engine Information and Specifications
Select Horsepower
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| Engine protection operator warning system |
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+ See All Specs
| Compatible with SmartCraft digital technology |
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| Starting |
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| Controls |
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| Steering |
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| Shaft length |
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| Gearcase ratio |
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| Gearcase |
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| Dry weight *Lightest model available |
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| CARB star rating |
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| Gearcase options |
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| Trim system |
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| Counter Rotation |
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| Dry Weight* |
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| Shaft Length |
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| Alternator AMP |
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| Color |
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| Warranty |
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- See Less
