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Yanmar 8LV350 – Inboard Diesel Engine 350 HP
Yanmar 8LV350 – 350 HP utilizes a high-torque 4.5L V8 propulsion design featuring twin turbochargers and an intercooler to deliver 350 HP of refined diesel power. This unit is optimized for larger planing hulls, offering a massive torque curve at low RPMs (800 Nm at 2300 RPM) to pop heavy fiberglass boats onto plane quickly, all while providing the quiet operation and low vibration of a balanced V8 platform.
- Precision Operational Data: Rated at 350 HP (257 kW) at 3800 RPM.
- Internal Engine Configuration Type: V8 90-Degree 4.46L Turbo-Aftercooled.
- Advanced Fuel Delivery System: High-Pressure Common Rail (HPCR).
- Recommended Vessel Application Use: Ideal for performance yachts and high-speed coastal craft.
- Factory Protection Service Plan: Yanmar global marine dealer support.
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Description
Yanmar 8LV350 350 HP – High-Efficiency V8 Marine Propulsion
Solving the vibration and weight issues common in high-horsepower diesel setups, the Yanmar 8LV350 utilizes a 90-degree V8 architecture to provide smooth, balanced power delivery. Generating 350 HP at 3800 RPM, this twin-turbocharged engine is optimized for high-speed planing hulls, offering a superior power-to-weight ratio that enhances fuel economy for American sportfishers. The wide power band ensures rapid throttle response, allowing US captains to navigate tight inlets and heavy seas with absolute confidence.
Meeting EPA Tier 3 emission standards, the 8LV350 features a sophisticated common-rail fuel system that provides clean, odor-free operation even at low idle speeds. This model is designed for seamless integration with the Yanmar VCS (Vessel Control System), providing modern American boaters with intuitive fly-by-wire controls and high-capacity electrical output for advanced navigation suites. Its robust freshwater cooling system is engineered to prevent galvanic corrosion in high-salinity Atlantic and Pacific waters.
Core Technical Specifications
- Maximum Output: 350 HP at 3800 RPM.
- Displacement: 272 cubic inches (4.46 Liters).
- Configuration: V8, 4-stroke, water-cooled diesel.
- Aspiration: Twin-turbocharged and intercooled.
- Dry Weight: Approximately 992 lbs (engine only).
- Alternator: High-output 12V / 180A for electronics.
- Compliance: Fully certified EPA Tier 3 emissions.
- Bore and Stroke: 3.39 x 3.78 inches.
Yanmar 8LV350 Full Specs
| Engine type | V8, 4-stroke, Water Cooled Diesel |
| Displacement | 4.46L (272 cid) |
| Bore x stroke | 86 x 96 mm |
| Horsepower | 350 hp (257 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 8LV350 Service & Performance Guide
What is the fuel consumption of the Yanmar 8LV350?
The 8LV350 consumes approximately 18.5 gallons per hour at its maximum 3,800 RPM. Featuring a twin-turbocharged V8 configuration, this engine uses common-rail fuel injection to optimize combustion pressure. Maintaining a steady cruising speed at 3,000 RPM significantly improves overall miles-per-gallon efficiency for high-speed coastal transit.
What oil grade is required for the Yanmar 8LV350?
This high-performance V8 requires 10.6 quarts of SAE 5W-30 or 15W-40 oil meeting API Service Class CJ-4. Due to the precision common-rail system, maintaining clean oil is critical for turbocharger and injector longevity. Replace the oil and specialized filter every 250 hours to comply with Yanmar warranty standards.
How does the Yanmar 8LV350 cooling system operate?
It utilizes a sophisticated closed-loop freshwater system with a high-capacity heat exchanger and integrated oil cooler. This twin-turbocharged engine requires constant coolant flow to manage high thermal loads during peak boost. Regularly inspect the zinc anodes within the seawater side of the heat exchanger to prevent galvanic corrosion.
What are the electrical system specifications for this engine?
Standard 8LV350 models come equipped with a heavy-duty 12V-180A alternator to support extensive onboard marine electronics. This high-output system is managed by the Yanmar VCS electronic control system for seamless power distribution. Ensure the battery bank meets the minimum 800 CCA requirement for reliable cold weather electronic starting.
What are the physical dimensions and weight of the 8LV350?
The 8LV350 has a dry weight of 992 lbs, measuring 45.4 inches in length and 34.8 inches in height. The narrow 90-degree V8 block design allows for twin-engine installations in boats with limited engine room beam. Proper engine mounts are required to handle the high torque output of this 4.46-liter diesel.
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