Evinrude 50 ETEC Specifications
| Engine Model: Evinrude E-TEC 50 |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 52.7 cu.in (863 cc) |
| Rated Engine Power: 50 Hp (37.3 kW) at 6000 rpm |
| Fuel System: Direct fuel injection (DFI) |
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The Evinrude E-TEC 50 is a technologically
advanced outboard recognized for its impressive power-to-weight ratio,
innovative direct injection system, and remarkable fuel efficiency. It
is engineered to deliver strong acceleration and torque characteristics
befitting its two-stroke heritage while meeting stringent emissions
standards. Owners benefit from an industry-leading maintenance schedule
requiring no scheduled dealer service for the first three years of
normal recreational use.
The engine's inline two-cylinder configuration contributes to a compact
profile, and the available model configurations include options for
tiller or remote steering. Whether powering aluminum fishing boats,
pontoon boats, or utility craft, this engine combines modern technology
with proven durability to elevate the boating experience.
The Evinrude 50 ETEC is built around an inline two-cylinder powerhead
utilizing advanced E-TEC direct fuel injection. This system is managed
by a sophisticated Engine Management Module (EMM) that continuously
monitors and optimizes fuel delivery, ignition timing, and lubrication
for peak performance across the entire RPM range. The engine is
available in several model configurations including E50DSL, E50DPGL, and
E50DGTL.
Power: 50 HP (37.3 kW) at the propeller
Engine Type: Inline 2-Cylinder E-TEC Direct Injection, 2-Stroke
Displacement: 863 cc (52.7 cu in)
Bore x Stroke: 91 mm x 66 mm (3.6 in x 2.6 in)
Full Throttle RPM Range: 5500-6000 RPM
Fuel Induction System: E-TEC Direct Injection with stratified low RPM
combustion mode
Alternator Output: 81 Amps Total Output / 25 Amps Net Dedicated
Starting System: Electric
Controls: Mechanical
Steering: Remote on E50DSL and E50DPGL; Tiller on E50DGTL
Gear Ratio: 2.9:1 specified in initial data; 2.67:1 also documented
Shaft Length: 20 inches (508 mm) for all listed models
Emissions Compliance: EPA 2013 / CARB 3 STAR / European Union
The powerhead of the Evinrude E-TEC 50 features an inline two-cylinder
block cast from high-strength, corrosion-resistant materials. The
cylinder bore measures 91 mm, and the piston stroke is 66 mm,
contributing to the engine's 863 cc displacement. As a two-stroke
engine, it utilizes a reed valve induction system. These one-way valves
are located in the intake manifold and control the air-fuel mixture
entering the crankcase.
The system is simple, reliable, and allows for high volumetric
efficiency. Pistons are manufactured from a high-strength material
originally developed by NASA, providing exceptional durability and heat
resistance. The engine design eliminates belts, pulleys, powerhead
gears, cams, oil scraping rings, and mechanized oil pumps that can cause
problems in other designs.
The fuel system is centered around Evinrude's advanced E-TEC direct
injection technology. High-pressure fuel injectors, precisely controlled
by the EMM, deliver a finely atomized fuel spray directly into the
combustion chambers. At low RPM, the engine operates in a stratified
combustion mode, creating a controlled fuel cloud near the spark plug
for exceptional fuel economy, reduced emissions, and idle smoothness.
At idle, injectors deliver approximately five cubic mm per shot,
comparable in size to a champagne bubble, contributing to the engine's
fuel efficiency. The engine is designed to operate on standard 87 octane
unleaded gasoline. The vapor separator pressurizes the fuel system to 30
psi to the injectors, eliminating the need for a separate fuel pump, and
is water-cooled to minimize fuel vaporization. At shutdown, fuel remains
stored between the nozzle and a check valve, enabling one-pull starts on
subsequent outings.
Lubrication is managed by a sophisticated multi-point targeted oiling
system. An electric oil pump, controlled by the EMM, draws oil from the
integral tank and injects it directly onto critical engine components
based on real-time engine speed and load demands. This system ensures
precise lubrication while minimizing oil consumption and emissions. An
on-engine oil tank with a capacity of 1.9 liters is standard.
The tank is designed to provide a minimum of 30 hours of operation with
standard oil, and this interval can be doubled when using premium XD-100
oil. The recommended lubricant is Evinrude XD-100 oil, a fully synthetic
oil specifically formulated for E-TEC engines to maximize performance
and reduce carbon deposits. The system eliminates the need for oil
changes, oil filters, and the disposal of used crankcase oil.
The cooling system is a pressure and temperature-controlled water-cooled
design utilizing a two-stage configuration. A high-capacity water pump
in the lower unit circulates water through extensive water jackets in
the cylinder block and cylinder head. External water intakes mounted in
the gearcase collect water and supply the inlet side of the water pump.
At low speeds below 1500 RPM, the pump operates as a positive
displacement pump; at higher speeds, it functions as a centrifugal pump.
At low engine speeds, a thermostat remains closed until water
temperature reaches approximately 143°F (62°C), at which point it opens
to allow water flow. At higher speeds above approximately 1800 RPM, a
pressure relief valve opens to allow water to bypass the thermostat,
providing enhanced cooling during high-speed operation. Cooling water is
also routed to the EMM water cavity to stabilize internal component
temperatures, then to the vapor separator, and finally to the overboard
indicator.
| Mid Section and Lower Unit |
The mid-section houses the driveshaft and exhaust tube, connecting the
powerhead to the lower unit. It is designed for robust performance and
features extensive corrosion-resistant coatings. The lower unit contains
the gearcase with reduction ratios documented as both 2.9:1 and 2.67:1.
The gearcase is robust and filled with high-performance lubricant,
featuring a F-N-R shifting mechanism.
The water pump outlet connects with passages in the midsection, with a
grommet sealing the pump housing to the exhaust housing. A small hole to
the rear of the water pump outlet provides cooling water for the tip of
the exhaust passage. Sacrificial zinc anodes are mounted on the lower
unit to deteriorate before other metal components, protecting against
galvanic corrosion. The exhaust is routed through the propeller hub.
The Evinrude E-TEC 50 is equipped with Power Trim and Tilt as standard
equipment across all listed models. This hydraulic system allows the
operator to adjust the engine angle for optimal boat performance,
acceleration, and shallow-water operation. The trim range is from -4 deg
to +16 deg, providing precise adjustment of the boat's running attitude.
The tilt range extends to 65 deg, offering ample clearance for beaching,
launching, or trailering. Models with manual tilt options are available
for specific configurations, featuring a tilt/run lever that must be
moved to the TILT position before raising the engine, and to the RUN
position before lowering. A tilt support bracket engages automatically
when the engine is fully tilted to lock it in position for transport or
storage.
Proper propeller selection is critical to allow the engine to operate
within its 5500-6000 RPM full-throttle range under normal load
conditions. The Evinrude 50 HP E-TEC utilizes propellers designed for
the 2.67:1 or 2.9:1 reduction ratio gearcase, which enables the use of
larger-diameter propellers for enhanced thrust and performance. The
specific propeller selection depends on boat type, intended use, and
load conditions. The propeller nut must be torqued to 70 to 80 lb-ft for
secure installation.
Weight (Dry) E50DSL: 109 kg (240 lbs);
Weight (Dry) E50DGTL: 113 kg (249 lbs)
Shaft Length: 20 inches (508 mm) for all listed models
The Evinrude 50 ETEC is engineered for minimal maintenance requirements.
A key benefit is no scheduled dealer maintenance required for the first
three years of normal recreational use. The engine features an
auto-winterization mode that simplifies long-term storage, eliminating
the need for manual fuel system treatment and dealer involvement.
The EMM continuously monitors engine systems and stores fault codes for
diagnostic purposes. Recommended pre-launch checks include verifying oil
level in the on-engine reservoir and inspecting for any signs of damage
or corrosion. Routine maintenance items include periodic inspection of
sacrificial anodes, particularly in saltwater applications.
The cooling system incorporates debris-resistant, flow-through design
and can be flushed using standard procedures. The S.A.F.E. (Speed
Adjusting Friction Elimination) system will activate to reduce engine
speed if an overheat condition or low oil pressure is detected.
Recommended Fuel: 87 Octane Unleaded
Recommended Oil: Evinrude XD-100 Oil
Propeller Nut: 70 to 80 lb-ft
Flywheel Nut: 100 to 115 lb-ft
Transom Mounting Bolts: 40 lb-ft
Powerhead to Base Bolts: 20 lb-ft
Cylinder Head: 20 lb-ft
The Evinrude E-TEC 50 is a highly versatile powerplant suitable for a
broad spectrum of boat types and boating activities. It is an ideal
choice for 14 to 18-foot aluminum fishing boats, providing the power
needed for rapid planing and efficient cruising in inland and coastal
waters.
The mechanical linkage architecture is consistent throughout the E-TEC
range and allows for straightforward conversion between remote and
tiller configurations using plug-and-play connectors. Whether navigating
small lakes, exploring coastal waters, fishing backwaters, or providing
reliable utility power, the engine offers the power, precision, and
efficiency to elevate any small boat experience.
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