Mercury 300 V8 Verado Specifications
| Engine Model: Mercury Verado 300 V8 |
| Engine Type: 4-stroke 8-cylinder DOHC 32-valve gasoline outboard engine |
| Total Displacement: 279 cu.in (4.6 L) |
| Rated Engine Power: 300 Hp (224 kW) at 6000 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
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The Mercury Verado 300 V8 is a naturally
aspirated outboard that redefines expectations for a 300 Hp engine. Its
foundation is a class-leading 4.6-liter V8 powerhead, which generates
substantial torque that translates into 20 percent quicker acceleration
out of the hole and a 12 to 15 percent torque advantage over a leading
competitor. This power is delivered with an extraordinary level of
civility, thanks to the Advanced MidSection (AMS) that cradles the
powerhead and isolates vibration from the hull.
The result is an exceptionally quiet and smooth ride from idle to
wide-open throttle. Paired with standard Digital Throttle and Shift
(DTS) and electro-hydraulic power steering, the Verado 300 V8 offers
instantaneous, precise control, making it an ideal choice for boaters
who demand both high performance and uncompromising onboard comfort for
applications ranging from offshore fishing to luxury cruising.
Engine Type: V8 with a 64-degree bank angle, 4-stroke.
Valvetrain: Dual Overhead Camshafts (DOHC) actuating 32 valves.
Displacement: 4.6 Liters (279 Cubic Inches).
Bore and Stroke: 3.6 inches by 3.4 inches (92 mm by 86 mm).
Power Output: 300 Hp at the propeller shaft (224 kW).
Full Throttle Operating Range: 5200-6000 RPM.
Fuel Induction System: Computer-controlled Electronic Fuel Injection
(EFI) with Advanced Range Optimization (ARO) for enhanced fuel
efficiency at cruising speeds.
Induction System: Performance-Tuned Long-Runner Intake Manifold.
Ignition System: SmartCraft PCM 112 Digital Inductive ignition.
Alternator Output: A high-output 115-amp alternator generates 1449 W.
The Idle Charge feature boosts alternator output at low RPM to manage
battery drain from modern electronics.
Recommended Fuel: Unleaded Regular 87 Octane (minimum) (R+M/2 method),
with a maximum of 10 percent ethanol.
Engine Protection: The SmartCraft Engine Guardian system monitors
critical sensors and can automatically reduce power to prevent damage in
adverse conditions.
Starting System: SmartStart Protection ensures safe, push-button
starting by preventing starter motor engagement if the engine is already
running.
Emissions Compliance: Certified with a CARB 3-star rating.
The robust foundation of the Verado 300 V8 is central to its performance
and durability characteristics.
Cylinder Block: The engine is constructed around a large-displacement
4.6-liter V8 block. This 64-degree V8 architecture, with its substantial
displacement, is the primary source of the engine's high torque output,
allowing it to work effortlessly under heavy loads without the need for
a supercharger. The bore and stroke are configured at 3.6 inches (92 mm)
and 3.4 inches (86 mm), respectively.
Cylinder Heads and Valvetrain: The engine features advanced cylinder
heads with Dual Overhead Camshafts (DOHC) operating four valves per
cylinder, for a total of 32 valves. This configuration optimizes airflow
into and out of the combustion chambers, contributing significantly to
the engine's power output and efficiency across the entire RPM range.
The fuel system is designed for both responsive performance and
optimized efficiency. It utilizes a computer-controlled Electronic Fuel
Injection (EFI) system with sequential multi-port design for precise
fuel metering under all conditions.
A key feature is Advanced Range Optimization (ARO), a proprietary
calibration that seamlessly adjusts the fuel delivery during cruise
speeds to maximize fuel economy without any noticeable change in engine
operation, effectively extending the boat's range. The system is
calibrated to deliver full performance on readily available 87-octane
fuel.
The engine is equipped with a reliable integrated wet sump lubrication
system. The recommended oil is NMMA Certified FCW SAE 10W-30, with a
total oil capacity of 7.0 US quarts (6.6 liters). Routine maintenance is
simplified by the industry-exclusive top cowl service door, allowing for
effortless oil level checks and top-ups without removing the engine
cover. All service points are color-coded for quick identification.
Cooling is managed by a robust water-cooled system that draws in ambient
water. A thermostat regulates the engine's operating temperature for
optimal performance, fuel efficiency, and longevity. The system also
includes a freshwater flushing provision for easy maintenance after
operation in salt or brackish water. Exhaust gases are expelled through
the propeller hub, contributing to the quiet operation.
| Mid Section and Lower Unit |
Advanced MidSection (AMS): This signature Verado feature is a
sophisticated mounting system that cradles the powerhead, moving the
engine mounts outward and aft. This design isolates the powerhead from
the transom, virtually eliminating vibration transmission to the boat's
hull and drastically reducing noise for an exceptionally smooth and
quiet ride.
Gearcase and Ratio: The engine is mated to a durable, hydrodynamic
5.44-inch gearcase. It is available with two primary gear ratio options
to optimize performance for different applications and boat weights: a
1.75:1 ratio and a 1.85:1 ratio. 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.
The Mercury 300 V8 Verado is equipped with a powerful electro-hydraulic
power trim and tilt system. This system allows the operator to precisely
adjust the engine angle for optimal 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 and beaching.
Propeller selection is crucial for matching the engine's power to the
specific boat and its intended use. Mercury offers a vast range of
propellers for the Verado 300 V8. The correct propeller must allow the
engine to operate within its 5200-6000 RPM full-throttle range at
wide-open throttle.
While the specific pitch and diameter are determined by boat weight,
hull design, and application, one example of a compatible propeller is a
3-bladed design with a 17.5-inch pitch. Mercury dealers and resources
like the Mercury Propeller Selector guide are used to determine the
optimal propeller for a given setup.
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
300 V8 has a dry weight of 600 lbs (272 kg). One source lists a slightly
lower weight range of 551-562 lb, which may reflect a specific model
year or configuration.
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.
Propeller Nut: 55 lb-ft (75 Nm).
Spark Plugs: 20 Nm (177 lb-in).
Engine Mounting Bolts: 66 lb-ft (90 Nm).
The versatility and refined power of the Mercury Verado 300 V8 make it
suitable for a wide array of boat types, performing admirably in both
single and multi-engine configurations. Rigid Inflatable Hulls (RIBs):
Its power and relatively light weight are well-suited for
high-performance RIBs.
Offshore Fishing Boats: Provides the torque and reliability needed for
running to distant grounds and the smooth operation desired by anglers.
Center Consoles and Dual Consoles: A perfect match for these popular
boats, delivering exhilarating performance and quiet, comfortable
cruising. Runabouts and Cuddy Cabins: Offers the refined power and quiet
operation expected for family outings, watersports, and weekend
cruising.
Pontoon and Tritoon Boats: The substantial displacement delivers the
torque required to propel large pontoon boats efficiently and with
authority. Multi-Engine Installations: Commonly used in twin, triple, or
quadruple configurations on larger offshore vessels, cruisers, and
high-performance boats. These setups benefit from joystick piloting
compatibility, allowing for intuitive maneuvering and station-holding
capabilities.
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