Description
Discover the MerCruiser 4.5L 250 HP MPI Alpha, engineered for performance, fuel efficiency, and durability in marine applications.
Overview
The MerCruiser 4.5L 250 HP MPI Alpha Sterndrive Engine is a cutting-edge marine propulsion system designed to deliver exceptional performance, efficiency, and reliability for recreational boating enthusiasts. Built with a 4.5-liter V6 engine, this powerplant offers a compelling alternative to traditional V8 engines, providing a balance of power and fuel economy.
Technical Specifications
| Specification | Details |
|---|---|
| Horsepower | 250 HP (184 kW) |
| Engine Type | V6, 2-valve/cylinder pushrod |
| Displacement | 4.5 liters (275 cu. in.) |
| Bore x Stroke | 4.0″ x 3.6″ (102 mm x 92 mm) |
| Compression Ratio | 9.4:1 |
| Fuel System | Multi-Port Electronic Fuel Injection (MPI) |
| Ignition System | SmartCraft PCM 112 Digital Inductive |
| Cooling System | Raw water cooled with thermostat; optional fresh water cooling with SeaCore |
| Exhaust System | Through-prop exhaust |
| Alternator Output | 70 amp / 882 watt (belt-driven) |
| Weight (Dry) | Approximately 800 lbs (363 kg) |
| Dimensions (L x W x H) | 48″ x 40″ x 40″ (1220 mm x 1016 mm x 1016 mm) |
| Recommended Oil | NMMA Certified FCW 25W-40 Synthetic Blend |
| Fuel Requirements | Unleaded Regular 87 Octane Minimum (R+M/2); 90 RON 10% Ethanol Maximum |
| Drive Compatibility | Alpha One Gen 2 |
| Warranty | 3-year limited warranty |
Performance Features
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Enhanced Torque & Acceleration: The 4.5L V6 engine delivers impressive torque, allowing for quick planing and smooth acceleration, making it ideal for both cruising and towing activities.
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Advanced Fuel Efficiency: The Multi-Port Electronic Fuel Injection (MPI) system fine-tunes the air-to-fuel ratio, optimizing fuel consumption across the RPM range.
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Adaptive Speed Control: Maintains consistent RPM during hard turns, enhancing handling and providing a sportier, more intuitive driving experience without the need for constant throttle adjustments.
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Quiet Operation: The engine’s design includes noise-reducing features, ensuring a quieter ride and a more pleasant boating experience.
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SmartCraft Integration: The engine is compatible with Mercury’s SmartCraft system, offering advanced diagnostics, fuel management, and engine monitoring through a digital interface.
Corrosion Protection
The MerCruiser 4.5L 250 HP MPI Alpha Sterndrive Engine is designed with durability in mind:
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MercFusion Paint System: Creates an outer seal against the elements, providing enhanced corrosion resistance.
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MerCathode® System: Provides automatic protection against galvanic corrosion, extending the engine’s lifespan.
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SeaCore® System: An optional package that includes industrial hardcoat anodizing on the drive, stainless-steel fasteners and components, and a closed cooling system for maximum defense against saltwater effects.
Maintenance & Serviceability
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Easy Access: The engine features redesigned service access points, bringing all service areas to a single easily reachable location, color-coded for owner-friendly maintenance.
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Seasonal Protection: The air-actuated “Season Extender” water drain system allows for easier winterization and protection against freezing temperatures.
Applications
The MerCruiser 4.5L 250 HP MPI Alpha Sterndrive Engine is suitable for a variety of boating activities, including:
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Cruising: Provides smooth and efficient cruising capabilities for leisurely outings.
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Towing: Offers sufficient power for towing water sports enthusiasts, such as wakeboarders and water skiers.
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Performance Boating: Delivers the necessary power and acceleration for high-performance boating experiences.
The MerCruiser 4.5L 250 HP MPI Alpha Sterndrive Engine offers a blend of power, efficiency, and reliability, making it an excellent choice for recreational boaters seeking a versatile and high-performing marine engine. Whether you’re cruising, towing, or seeking performance, this engine is designed to enhance your boating experience.
