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Yanmar 8LV320 – Inboard Diesel Engine 320 HP
Yanmar 8LV320 – 320 HP is a refined clean-running boat motor utilizing a 4.5L V8 90-degree architecture, engineered for a superior power-to-weight ratio in the 300+ HP class. This 320 HP diesel features twin turbochargers and a common rail fuel system, delivering the explosive “outboard-like” acceleration and high top-end speeds preferred for sporty runabouts and luxury yacht tenders while maintaining the fuel safety of diesel.
- Internal Architecture Dimensions: V8 90-Degree 4.46L Displacement.
- Standard Engine Block Architecture: 32-Valve DOHC with Twin Turbochargers.
- Intelligent Fuel Management System: Electronic Common Rail with Denso Injectors.
- Vessel Hull Integration Guide: Best for sporty motorboats and performance cruisers.
- Reliability And Service Plan: Yanmar 2+3 year limited warranty (select regions).
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Description
Yanmar 8LV320 320 HP – Compact Luxury Yacht Diesel V8
Reducing the footprint of high-performance V8 diesels without compromising on torque is the mechanical achievement of the Yanmar 8LV320. Delivering 320 HP at 3800 RPM, this engine provides the refined, quiet operation demanded by the USA luxury yacht market. The twin-turbocharged configuration is specifically tuned for American express cruisers, providing the low-end punch needed for quick acceleration and the high-end efficiency required for long-distance cruising across the Great Lakes or the Gulf Stream.
Adhering to USA EPA Tier 3 regulations, the 8LV320 employs a high-pressure common-rail injection system and an advanced ECU to ensure optimal combustion at all throttle positions. For the American owner, this results in significant fuel savings and reduced environmental impact without sacrificing performance. The engine’s high-capacity 180-amp alternator is designed to keep house battery banks fully charged, supporting the extensive array of AC, refrigeration, and electronics common on modern US vessels.
Core Technical Specifications
- Maximum Output: 320 HP at 3800 RPM.
- Displacement: 272 cubic inches (4.46 Liters).
- Configuration: V8, 90-degree, 4-stroke diesel.
- Aspiration: Twin-turbocharged with liquid intercooling.
- Dry Weight: Approximately 992 lbs (excluding gearbox).
- Electrical: 12V / 180A high-capacity alternator.
- Compliance: EPA Tier 3 and RCD2 certified.
- Fuel System: Common-rail direct injection.
Yanmar 8LV320 Full Specs
| Engine type | V8, 4-stroke, Water Cooled Diesel |
| Displacement | 4.46L (272 cid) |
| Bore x stroke | 86 x 96 mm |
| Horsepower | 320 hp (235 kW) |
| Rated rpm | 3800 rpm |
| Aspiration | Twin Turbocharged & Intercooled |
| Compression ratio | 15.8:1 |
| Fuel system | Common Rail Injection |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-2-7-3-4-5-6-8 |
| Alternator | 12V, 180 Amp |
| Gear ratio/Drive | KMH61A / KMH61V |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 450 kg (992 lbs) |
| Flywheel housing | SAE 3 |
| Steering | Electronic Control (VC10) |
| Coolant capacity | 12L |
| Exhaust system | Water cooled manifold |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 11.5L |
| Emissions rating | EPA Tier 3, RCD II, IMO II |
Yanmar 8LV320 Service & Performance Guide
What is the fuel consumption of the Yanmar 8LV320?
The Yanmar 8LV320 consumes approximately 16.8 gallons per hour when operating at its full 3,800 RPM rating. The high-pressure common rail system and twin-turbochargers ensure precise fuel delivery and reduced smoke emissions. For maximum efficiency, utilize the electronic control system to find the optimal plane-speed to fuel-burn ratio.
What oil grade is required for the Yanmar 8LV320?
This engine requires 10.6 quarts of high-quality SAE 15W-40 oil that meets the API CJ-4 or CK-4 specification. Frequent oil analysis is recommended for engines used in commercial or high-load applications to monitor internal wear. Change the oil and primary filter every 250 hours to protect the turbocharger bearings.
How does the Yanmar 8LV320 cooling system operate?
The system uses an indirect freshwater cooling circuit with a dedicated seawater-cooled heat exchanger and intercooler system. Freshwater circulates through the block and turbochargers, while seawater cools the heat exchanger, oil, and intake air. Periodically check the sea-strainer for debris to ensure unrestricted cooling water flow at high speeds.
What are the electrical system specifications for this engine?
This model features a standard 12V-180A alternator providing ample power for modern NMEA 2000 electronics and house battery banks. The integrated Yanmar CAN-bus system communicates engine data directly to digital helm displays for real-time monitoring. Battery cables must be sized according to ABYC standards to handle the high alternator output.
What are the physical dimensions and weight of the 8LV320?
The 8LV320 weighs 992 lbs without the gear, featuring a length of 45.4 inches and width of 31.8 inches. Its lightweight V8 construction offers a superior power-to-weight ratio compared to traditional inline-six marine diesel engines. Ensure the engine stringers are reinforced to accommodate the concentrated weight and vibration of the V8.
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