Mercury 115ELPT 115HP – Command Thrust Four Stroke 20-Inch Shaft

Mercury 115ELPT 115HP Command Thrust

The Mercury 115ELPT is a powerful 115HP FourStroke outboard featuring the legendary Command Thrust gearcase, engineered for heavy-load marine applications in the United States. Built upon a 2.1L inline four-cylinder 8-valve SOHC architecture and weighing 363 lbs, this engine maximizes displacement to deliver an torque curve. This 20-inch long shaft model is configured for standard rotation, making it an ideal primary power source for mid-sized pontoons and fiberglass deep-V hulls. Our dependable outboard propulsion systems provide the trusted mechanical simplicity necessary for reliable everyday coastal and inland operation.

Operational peak performance for this Mercury 115HP is achieved across the 5000 to 6000 RPM range, utilizing Multi-Port EFI for advanced thermal efficiency. The heavy-duty 2.38:1 Command Thrust gear ratio is strategically designed to turn a larger propeller, offering superior hole-shot performance and steady hull planing in heavy swells. Engineered in the USA, this corrosion-resistant outboard includes advanced vibration dampening for the comfort required during rigorous saltwater missions.

2.1L Four-Stroke Architecture

The 2.1L inline four-cylinder SOHC design maximizes combustion efficiency and structural rigidity. This translates into reliable low-end torque that commercial mariners depend on when hauling heavy fishing gear through dense coastal marshlands and strong, unpredictable tidal currents.

Command Thrust Gearcase

The defining feature of this 115HP outboard is the oversized Command Thrust lower unit. Operating at a 2.38:1 ratio, it sits deeper in the water and spins a much larger prop. This minimizes prop slip and maximizes hydrodynamic bite, easily lifting heavy fiberglass center consoles or multi-log pontoons onto plane.

Multi-Port EFI Precision

Mercury’s Multi-Port Electronic Fuel Injection continuously monitors atmospheric variables to deliver the appropriate air-fuel ratio. This is designed to support instant throttle response and prevents engine bogging during rapid acceleration scenarios while navigating tricky channels in the American saltwater marine environment.

SmartCraft Digital Integration

Equipped with SmartCraft PCM 07 ignition, this motor easily networks with modern digital helm displays. The high-output 35 Amp alternator keeps the battery bank charged, ensuring radar and heavy sonar systems remain operational during long days offshore.

Mercury 3-Year Warranty

This 115HP Command Thrust outboard is backed by a comprehensive 3-Year Limited Warranty for American owners. This factory-level protection helps support long-term peace of mind and grants access to genuine parts through a vast nationwide marine dealer network.

Heavy Pontoon Vessel Match

This remote mechanical outboard is a practical power solution for heavy aluminum pontoons and mid-sized fiberglass center consoles. It provides the sustained high-end thrust needed for navigating difficult coastal tidal flows while remaining fuel efficient.

Maintenance & Longevity

Regular inspection of the 5.2L wet sump lubrication system is critical for maintaining internal engine tolerances over years of heavy use. Always flush the cooling system with fresh water after every saltwater excursion.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.