Description
Discover the power and technology of the MerCruiser 8.2L HO 425 HP DTS inboard engine for an exceptional boating experience.
MerCruiser 8.2L HO 425 HP DTS – High-Performance Marine Power
Introduction
The MerCruiser 8.2L HO 425 HP DTS is a high-output, high-performance marine engine engineered for boaters who demand maximum power, precise control, and smooth operation. Delivering 425 horsepower, this engine is part of the MerCruiser Horizon series, designed for large recreational vessels, sportboats, and luxury cruisers requiring superior acceleration and reliable propulsion.
Featuring Digital Throttle & Shift (DTS) technology, the 8.2L HO allows precise electronic control of throttle and gears, eliminating traditional mechanical linkages. This provides seamless gear changes, faster response, and improved maneuverability, especially in tight docking situations or high-speed operations.
Whether for water sports, offshore cruising, or high-speed adventure, the 8.2L HO 425 HP DTS engine offers an unbeatable combination of raw power, smooth handling, and modern technology.
Product Description
The MerCruiser 8.2L HO is a naturally aspirated V8 gasoline engine, optimized for marine use. Its high-output configuration produces 425 horsepower at rated RPM, supported by a large-displacement 8.2-litre block designed for durability and consistent performance under heavy loads.
The DTS system enables electronic control over throttle and transmission, allowing boaters to achieve smoother acceleration, precise maneuvering, and reduced operator fatigue. The engine features high-strength aluminum block and cylinder heads treated with corrosion-resistant coatings to withstand harsh marine environments.
A closed-loop freshwater cooling system with heat exchanger and raw water pump maintains optimal engine temperature, protecting the engine from seawater corrosion while ensuring consistent performance. Resilient engine mounts and precision-balanced components reduce vibration and noise, enhancing onboard comfort.
The 8.2L HO 425 HP DTS is designed with serviceability in mind. Key maintenance points—oil and fuel filters, dipsticks, and coolant access—are easily accessible to minimize downtime.
Key Features
-
High Power Output: 425 HP at rated RPM for superior acceleration and propulsion in large recreational or sport vessels.
-
Digital Throttle & Shift (DTS): Provides smooth throttle response, precise gear shifting, and enhanced vessel handling.
-
V8 High-Output Architecture: Offers exceptional torque across low- and mid-range RPMs for towing, water sports, and high-speed performance.
-
Durable Construction: Aluminum block and cylinder heads with marine-grade corrosion protection.
-
Fuel Efficiency: Optimized intake and combustion for improved fuel economy without compromising performance.
-
Low Noise & Vibration: Balanced V8 and resilient mounts enhance onboard comfort.
-
Marine Cooling System: Closed-loop freshwater system with heat exchanger and raw water pump protects against corrosion.
-
Global Support: Supported by MerCruiser’s worldwide dealer network for parts and technical assistance.
Technical Specifications
| Category | Specification |
|---|---|
| Engine Model | MerCruiser 8.2L HO DTS |
| Engine Type | V8, 4-stroke, naturally aspirated gasoline |
| Displacement | 8.2 litres |
| Aspiration | Naturally aspirated |
| Cooling System | Closed-loop freshwater with heat exchanger |
| Rated Power | 425 HP (317 kW) |
| Max Torque | Approx. 820 Nm at 3,200 RPM |
| Fuel System | Sequential electronic fuel injection |
| Fuel Type | Gasoline |
| Rated Speed | 4,600 RPM |
| Transmission | DTS-compatible marine gearbox |
| Alternator | 12V / 95A |
| Starting System | 12V electric starter |
| Exhaust | Closed-loop water-cooled exhaust manifold |
| Weight | Approx. 480–520 kg |
| Rotation | Clockwise (from flywheel end) |
| Noise & Vibration | Low-noise, low-vibration design with resilient mounts |
| Emission Compliance | Meets EPA Tier 3 and IMO marine standards |
| Applications | Luxury yachts, sportboats, cruisers, high-performance recreational vessels |
Performance and Reliability
The 8.2L HO 425 HP DTS is engineered for maximum performance and reliability. Its V8 high-output architecture delivers strong torque for rapid acceleration, towing, and heavy-load performance. The DTS system enhances throttle response and gear shifting, improving maneuverability and overall control in demanding conditions.
Durable construction, corrosion-resistant components, and a closed-loop cooling system ensure long-term reliability, even in harsh offshore environments. The engine is designed for smooth power delivery, low vibration, and minimal operator fatigue.
Applications
Ideal for:
-
Large recreational yachts and cruisers requiring high-performance propulsion.
-
Sportboats designed for water sports, rapid acceleration, and offshore cruising.
-
High-performance vessels demanding precision control and smooth handling.
-
Luxury cruisers and motorboats seeking reliability, power, and comfort.
Its combination of power, precision control, and durability makes it suitable for both casual and professional marine operators.
Installation and Maintenance
The engine’s layout allows for flexible installation in larger engine compartments. Routine maintenance is simplified with easily accessible service points for oil, fuel, and coolant systems. Optional accessories, including marine gearboxes, instrumentation, and propulsion integration kits, provide seamless system integration.
Recommended service intervals include oil and filter changes every 100–150 hours, with comprehensive inspections at longer intervals. Mercury’s global dealer network provides access to spare parts, technical support, and professional service, ensuring vessels remain operational.
The MerCruiser 8.2L HO 425 HP DTS engine delivers exceptional power, smooth control, and marine durability. With its V8 high-output configuration, DTS electronic control, and corrosion-resistant construction, it provides rapid acceleration, precise maneuverability, and reliable performance for high-performance recreational vessels. Ideal for sportboats, luxury cruisers, and offshore boats, the 8.2L HO 425 HP DTS ensures boaters enjoy unmatched performance and confidence on the water.
