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Mercury 350 L6 Verado Specifications
| Engine Model: Mercury Verado 350 L6 |
| Engine Type: 4-stroke inline 6-cylinder supercharged gasoline outboard engine |
| Total Displacement: 158.5 cu.in (2.6 L) |
| Rated Engine Power: 350 Hp (257 kW) at 6400 rpm |
| Fuel System: Sequential multi-point electronic fuel injection (EFI) |
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| General Technical Data |
The Mercury Verado 350 L6 is defined by its
supercharged power delivery and exceptional refinement. The heart of
this engine is a 2.6-liter inline-six, an architecture that is naturally
balanced, producing minimal vibration. Mercury's engineers amplified
this inherent smoothness by force-feeding the engine with a water-cooled
supercharger, which provides massive, instantaneous torque across the
entire rpm range. This results in a driving experience where power is
available instantly, propelling boats onto plane with startling speed.
This formidable power is delivered with a quietness and civility that is
remarkable, thanks to the Advanced MidSection (AMS) which isolates the
powerhead and virtually eliminates vibration transmission to the hull.
The 350 L6 is fully integrated with Mercury's SmartCraft digital
technology, including Digital Throttle and Shift (DTS) and
electro-hydraulic power steering, providing precise, fingertip control.
For boat owners who refuse to compromise on performance, the
supercharged Verado 350 L6 remains a legendary and highly desirable
power choice.
Engine Type: Inline 6-cylinder (L6), four-stroke, supercharged.
Valvetrain: Dual Overhead Camshafts (DOHC) with 24 valves.
Displacement: 2.6 Liters (158.5 Cubic Inches).
Bore and Stroke: 3.23 inches by 3.23 inches (82 mm by 82 mm).
Power Output: 350 Hp at the propeller shaft (257 kW).
Full Throttle Operating Range: 5800-6400 RPM.
Idle RPM (in neutral): 600 RPM.
Air Induction: Supercharged system with charge air cooling and
electronic boost pressure control to manage power delivery and maintain
air density for maximum combustion efficiency. The supercharger is
water-cooled to increase efficiency and durability.
Fuel Induction System: Sequential multi-port electronic fuel injection
(EFI) for precise fuel metering.
Ignition System: SmartCraft PCM Digital Inductive ignition.
Alternator Output: A belt-driven 70-amp alternator produces 882 W,
sufficient for modern electronics and house loads.
Recommended Fuel: For maximum performance, unleaded 95 RON is
recommended.
The engine can operate on 91 RON minimum, with anti-knock sensors
managing performance accordingly.
The fuel system is designed for fuel containing up to 10 percent
ethanol.
Recommended Oil: Mercury FourStroke 25W-40 Marine Oil.
Engine Oil Capacity: 7.4 US quarts (7.0 Liters).
Engine Protection: The SmartCraft Engine Guardian system monitors
critical sensors and can automatically reduce power to prevent damage
from adverse operating conditions.
Starting System: Electric Start with SmartStart Protection, which
prevents starter motor engagement if the engine is already running.
Steering: Electro-hydraulic power steering, standard.
Controls: SmartCraft Digital Throttle and Shift (DTS).
Emissions Compliance: CARB 3-star rating.
Battery Requirements: 800 minimum marine cranking A (MCA) with a minimum
reserve capacity of 135 minutes (RC25 rating).
| Powerhead |
The L6 engine's architecture is central to its performance character and
legendary smoothness.
Cylinder Block: The engine is built on a robust 2.6-liter inline
6-cylinder block. This configuration is inherently balanced, eliminating
many of the primary vibrations found in other engine types. The
deep-skirt block design provides a stiff foundation for the rotating
assembly, ensuring durability under the high cylinder pressures
generated by the supercharger.
Cylinder Head and Valvetrain: The engine utilizes a sophisticated Dual
Overhead Cam (DOHC) design with 24 valves. This valvetrain, combined
with the forced induction system, optimizes airflow at high rpm to
achieve the engine's 6400 RPM redline and peak Hp figure.
| Fuel System |
The fuel system is engineered for both high performance and efficiency. It uses a sequential multi-port electronic fuel injection (EFI) system, where each cylinder receives a precisely timed and metered fuel charge for optimal combustion under all loads.
The engine's computer manages this process, integrating with the electronic boost control to deliver a seamless and responsive power curve, which a reviewer noted as being "scintillating". A water-cooled supercharger increases the density of the air-fuel mixture for a significant energy boost without the weight of a larger-displacement engine.
| Lubrication System |
The engine utilizes a high-capacity integrated wet sump lubrication system to handle the demands of forced induction. The total oil capacity is 7.4 US quarts (7.0 Liters). The recommended oil is Mercury FourStroke 25W-40 Marine Oil, a formulation designed to withstand the high temperatures and shear forces present in supercharged applications. The system features a heat-exchanging oil cooler for enhanced durability.
| Cooling System |
Cooling is managed by a high-flow water-circulation system with thermostat and pressure control, critical for maintaining safe operating temperatures in a supercharged engine. It draws ambient water to cool the powerhead.
The system also serves the charge air cooler (intercooler), which reduces the temperature of the compressed air from the supercharger before it enters the combustion chamber, increasing air density and thus power output. The supercharger itself is also water-cooled to improve efficiency.
| Mid Section and Lower Unit |
Advanced MidSection (AMS): A signature Verado feature, the AMS cradles
the powerhead on perimeter mounts, moving the engine mounts outward and
aft. This design isolates the powerhead from the transom, drastically
reducing vibration and noise transmitted to the hull and helm for an
exceptionally smooth and quiet ride.
Gearcase and Ratio: The engine is mated to a durable, hydrodynamic
5.44-inch gearcase. The primary gear ratio is 1.75:1. The shift
mechanism is forward-neutral-reverse (F-N-R). Exhaust: The exhaust
system is routed through the propeller hub, which further contributes to
noise reduction underwater and at the transom.
| Trim and Tilt System |
The Mercury 350 L6 Verado is fitted with a heavy-duty power trim and
tilt system with SmartCraft programmability. This allows for precise
adjustment of the engine angle to optimize boat performance, handling,
and shallow water operation.
Maximum Trim Range: 20 deg (ranging from -6 deg to +14 deg). Maximum
Tilt Range: 73 deg (ranging from -6 deg to +67 deg) for complete
trailering clearance.
| Propeller Information |
Selecting the correct propeller is essential to fully utilize the Verado 350's supercharged torque band. Mercury offers a comprehensive range of propellers specifically designed for the L6 gearcases. The correct propeller must allow the engine to operate within its 5800-6400 RPM full-throttle range.
In a sea trial on a boat with twin 350 L6 engines, the optimal propeller was found to be a 3-bladed 14-inch diameter by 19-inch pitch stainless steel model. The specific pitch and diameter are determined by factors such as boat weight, hull design, and intended use, and are best selected using the Mercury Propeller Selector or dealer expertise.
| Dimensions and Weight |
Shaft Length Options:
20 inches (508 mm)
25 inches (635 mm)
30 inches (762 mm).
Dry Weight (Lightest Model): The lightest configuration of the Verado
350 L6 has a dry weight of 668 lbs (303 kg) for the 20-inch shaft model.
| Maintenance Data |
Every 100 hours:
Change engine oil and replace the oil filter.
Check the outboard for tightness to the boat transom.
Inspect thermostat visually for corrosion and/or for a broken spring.
Check engine water separating fuel filter for contaminants.
Clean and/or replace filter.
Drain and replace gearcase lubricant.
Check power steering fluid.
Inspect battery.
Check wiring and connectors.
Every 300 hours:
Replace water pump impeller.
Check power trim fluid.
Replace high‑pressure in‑line fuel filter.
Replace spark plugs.
Replace accessory drive belt.
The spark plug gap should be set to 0.8 mm (0.0315 in.)
| Tightening Torques |
Propeller Nut: 55 lb-ft (75 Nm).
Spark Plugs (NGK ILFR6G-E): 20-22 lb-ft (27-30 Nm).
Cylinder Head Bolts: 15-25 lb-ft.
| Boat Applications |
Offshore Fishing Boats: Its immense low-end torque and ability to
maintain speed in rough seas make it a premier choice for serious
anglers targeting tuna and marlin in large center consoles. Its narrow
footprint is ideal for multi-engine setups on these vessels.
High-Performance Center Consoles and Runabouts: It delivers the
thrilling acceleration and top-end speed sought by performance-oriented
boaters.
Multi-Engine Setups: The L6 is extremely popular in twin, triple, and
quad configurations on larger offshore vessels, sport-fishing rigs, and
catamarans. These setups fully leverage the Verado's joystick piloting
compatibility, allowing for intuitive maneuvering and station-holding
capabilities. Pontoon and Tritoon Boats: The supercharged torque
provides the power to propel luxury pontoons with authority,
transforming their performance and onboard experience.
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