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Yanmar 6LPA-STP2 315HP Inboard Diesel Marine Engine
The Yanmar 6LPA-STP2 315HP inboard diesel marine engine directly provides 315 HP at 3800 RPM utilizing an inline 6-cylinder 24-valve overhead cam configuration optimized for narrow footprint arrays
- Features direct mechanical injection pump hardware
- Provides 4.164 Liters total displacement
- Supports fresh water closed loop heat exchangers
- Requires diesel fuel number 2 D
- Weighs 408 kg excluding marine gearboxes
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Description
The Yanmar 6LPA-STP2 315HP Inboard Diesel Marine Engine eliminates frustrating power lag and sluggish acceleration tracking on fast sport cruisers, water taxi hull retrofits, rapid planing center consoles, and recreational fishing platforms. Running on standard number 2-D marine diesel, this high-speed performance four-stroke engine coordinates direct injection with mechanical high-pressure injection pumps to replace bulky legacy power plants entirely. Vessel captains can accelerate through heavy offshore swells safely, letting the advanced turbocharged intercooler induction network balance air-to-fuel ratios flawlessly up to a peak 3800 RPM full throttle range.
Constructed with a fresh water closed loop heat exchanger with raw water sea-loops, the vertical inline-six overhead cam block prevents internal engine hot spots inside unventilated machinery rooms. The robust 4.164-liter engineering architecture delivers an intense 315 horsepower crankshaft output, managing electrical parameters via an integrated 80 Amp at 12 Volts base charging array. Procuring this premium Japan-manufactured marine diesel engine optimizes structural narrow footprint inline configurations, backed by a comprehensive 2-Year limited pleasure marine factory warranty plan.
Key Features of Yanmar 6LPA-STP2
- Inline 6-Cylinder 24-Valve Overhead Cam Vertical Marine Diesel Engine links a high-torque 4164 cc cylinder layout with direct mechanical injection to secure elite power-to-weight metrics.
- Turbocharged with Intercooler Aspiration induction system forces compressed charge-air into combustion chambers forcefully to generate instantaneous acceleration under heavy boat loads.
- Direct Injection with Mechanical High-Pressure Injection Pump multi-calibrates fuel pressure curves dynamically to minimize fuel burn while completely eliminating common electronic failure paths.
- Integrated 80 Amps 12 Volts Base Setup Alternator delivers a dedicated electrical current straight to deep-cycle house batteries to run complex navigation components easily.
- Fresh Water Closed Loop Heat Exchanger with Raw Water Sea-Loops seals crucial internal galleries from raw saltwater corrosion using closed loop antifreeze circulation layers.
- Rugged 94.0 mm Bore by 100.0 mm Stroke Assembly provides a heavy-duty mechanical foundation engineered to withstand thousands of continuous high-speed runtime hours.
- Overbuilt 15.8’1 Structural Compression Ratio Architecture maximizes thermal combustion expansion to drive rapid planing hulls forcefully through moving currents.
- Low Profile Balanced Narrow Footprint Inline Array Casing limits dry weight metrics to 899 lbs to maximize high-speed planing hull velocity thresholds.
- High-Octane Minimum 45 Cetane Fuel Adaptation handles varied international marine diesel fuel grades smoothly without triggering injector knocking or valve soot buildup.
- Strict Historical Framework Emission Compliance profiles meets required EPA Tier 2 and IMO Tier I marine guidelines through precise overhead camshaft valve timing.
In the Box
- 1x Yanmar 6LPA-STP2 315HP Inboard Marine Diesel Engine
- 1x Pre-Fitted 80A 12V Base Charging Alternator
- 1x Integrated Closed-Loop Fresh Water Heat Exchanger Assembly
- 1x Technical Instrumentation Interconnect Block Panel and Wiring Guide
Direct Mechanical Injection Engineering Shields Rapid Planing Water Taxis
Designed for fast sport cruisers and rapid planing center consoles ranging from 28 to 42 feet, this 315HP inline six-cylinder marine diesel ensures stable inboard propulsion. The rugged OHC configuration coupled with comprehensive 2-Year limited pleasure marine factory warranty coverage shields owners from unexpected system breakdowns and expensive replacement bills. Monitoring raw water impeller wear and changing oil profiles according to standard seasonal care routines ensures pristine engine reliability, protecting your vessel asset through years of continuous blue-water transit.
Yanmar 6LPA-STP2 315HP Inboard Diesel Marine Engine Specs
| Brand | Yanmar |
| Full Model SKU/Code | 6LPA-STP2 |
| Country of Origin | Japan |
| Engine Family/Series | 6LPA Series High-Speed Performance Diesel |
| Engine Type / Configuration | Inline 6-Cylinder, 24-Valve, 4-Stroke, Overhead Cam (OHC) Marine Diesel |
| Fuel Type | Marine Diesel |
| Displacement | 4.164 Liters / 4164 cc |
| Horsepower Output | 315 HP / 232 kW (At Crankshaft) |
| Full Throttle RPM Range | 3800 RPM |
| Aspiration / Induction System | Turbocharged with Intercooler |
| Fuel Injection System | Direct Injection with Mechanical High-Pressure Injection Pump |
| Bore x Stroke | 94.0 mm x 100.0 mm |
| Compression Ratio | 15.8:1 |
| Cooling System Method | Fresh Water Closed Loop Heat Exchanger with Raw Water Sea-Loops |
| Alternator Output | 80 Amps / 12 Volts Base Setup |
| Recommended Fuel Grade | Diesel Fuel No. 2-D, Cetane Rating Min 45 |
| Emission Compliance | EPA Tier 2, IMO Tier I, RCD 1 Compliant Historical Framework |
| Dry Weight | 408 kg / 899 lbs (Excluding Marine Gearbox) |
| Application | Fast sport cruisers, water taxi hull retrofits, rapid planing center consoles, and recreational fishing platforms requiring narrow footprint inline arrays (28-42 ft hulls) |
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