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Yanmar 6LPA-STP2 – Inboard Diesel Engine 315 HP
Harnessing a muscular 4.164L engine block to deliver elite power-to-weight performance, the Yanmar 6LPA-STP2 supplies sportfishers and fast commuters with 315 hp of reliable mechanical propulsion.
- Mechanical inline fuel pumps provide bulletproof off-grid electrical reliability.
- Turbocharged and intercooled mechanics handle intensive throttle tracking loads.
- Hydraulic transmission compatibility ensures seamless gear shifting responses.
- Freshwater cooled manifold blocks harsh raw saltwater scale deposition.
- 899 lbs robust engine framing dampens structural hull vibrations.
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Description
Yanmar 6LPA-STP2 315 HP – Compact High-Speed Marine Diesel
Addressing the demand for high-RPM performance in lightweight hulls, the Yanmar 6LPA-STP2 delivers 315 HP at 3800 RPM. This 4.2-liter engine is renowned in the USA for its reliability, utilizing a robust overhead cam design that minimizes mechanical noise and enhances fuel atomization. For American recreational boaters, the 6LPA series provides the high-end speed needed for skiing and fast transit while maintaining the legendary longevity associated with Yanmar’s heavy-duty engineering.
Adhering to EPA Tier 3 standards, the 6LPA-STP2 features a refined injection system that ensures clean starts and reduced smoke during harbor maneuvering. The engine’s narrow dimensions make it ideal for twin-engine configurations in American express cruisers where maintenance access is often limited. Its 80-amp alternator provides sufficient charging for house batteries, ensuring that modern GPS and sonar systems remain fully powered during extended coastal voyages in USA waters.
Core Technical Specifications
- Maximum Output: 315 HP at 3800 RPM.
- Displacement: 254 cubic inches (4.164 Liters).
- Configuration: 6-cylinder in-line, 4-stroke diesel.
- Aspiration: Turbocharged and intercooled.
- Dry Weight: Approximately 900 lbs without gear.
- Electrical: 12V / 80A alternator included.
- Compliance: EPA Tier 3 certified.
- Bore and Stroke: 3.70 x 3.94 inches.
Yanmar 6LPA-STP2 Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 4.164L (254 cid) |
| Bore x stroke | 94 x 100 mm |
| Horsepower | 315 hp (232 kW) |
| Rated rpm | 3800 rpm |
| Aspiration | Turbocharged & Intercooled |
| Compression ratio | 18.1:1 |
| Fuel system | Mechanical In-line Pump |
| Recommended fuel | Diesel (ISO 8217 DMA) |
| Ignition/Firing Order | Compression / 1-5-3-6-2-4 |
| Alternator | 12V, 80 Amp |
| Gear ratio/Drive | KMH50A / ZF compatible |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 408 kg (899 lbs) |
| Flywheel housing | SAE 3 |
| Steering | Mechanical / Hydraulic compatible |
| Coolant capacity | 14L |
| Exhaust system | Fresh water cooled manifold |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 10L |
| Emissions rating | IMO Tier II compliant |
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