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Suzuki DF350AMD Specifications
| Engine Model: Suzuki DF350AMD |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 268 cu.in (4.4 L) |
| Rated Engine Power: 350 Hp (257.4 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| General Technical Data |
The Suzuki DF350AMD is a technologically
supreme outboard that redefines the high-Hp experience through its
innovative integrated steering system. By moving the steering cylinder
into the mid-unit, Suzuki has eliminated the external steering ram,
creating a cleaner transom appearance, providing better clearance in the
motorwell for easier rigging on various boat types, and allowing the
engine to tilt up without risk of damage.
The redesigned gear case reduces frontal projected area by 4 percent,
which decreases water resistance, increases top speed by more than 2
percent, and contributes to improved fuel efficiency. Improved gear oil
circulation lowers operating temperatures, enhancing durability while
reducing gear oil capacity from 3.2 liters to 2.8 liters.
The proven Suzuki Dual Prop System distributes engine torque evenly over
two contra-rotating propellers, reducing torque per propeller and
enabling a more hydrodynamic gear case design while delivering
exceptional stability and powerful reverse thrust.
With features like the Dual Injector System, Dual Louver air intake,
Variable Valve Timing, and the Lean Burn Control System, the DF350AMD
delivers awesome power with maximum efficiency and reliability.
Engine Model: Suzuki DF350AMD
Engine Type: 4-Stroke, 55° V6, DOHC (Double Overhead Camshaft), 24-Valve
Number of Cylinders: 6
Valve Train Drive: Self-adjusting oil-bathed timing chain with automatic
hydraulic tensioner
Bore and Stroke: 98.0 mm x 97.0 mm (3.86 in x 3.82 in)
Piston Displacement: 4390 cc (268 cu. in)
Maximum Output: 257.4 kW (350 Hp)
Full Throttle Operating Range: 5700-6300 rpm
Fuel Delivery System: Multi-Point Sequential Electronic Fuel Injection
with Dual Injectors and Lean Burn Control
Alternator: 12V 54A
Steering: Remote with Integrated Steering System
Control System: Suzuki Precision Control (Digital Drive-by-Wire)
Trim Method: Power Trim and Tilt
Gear Ratio: 2.29:1 with 2-Stage Gear Reduction
Gear Shift: F-N-R (Forward-Neutral-Reverse) via Suzuki Precision Control
Propeller Selection: 12"-31.5" pitch, Contra-Rotating Dual Propellers
Starting System: Electric with Suzuki Keyless Start System
Ignition System: Full-transistorized Solid State Direct Ignition
Engine Lubrication: Pressure lubrication by trochoid pump
Engine Oil Capacity: 8.0 L (8.4 qt)
Gear Oil Capacity: 2.8 L (3.0 US qt)
Spark Plug: NGK DCPR6E
Spark Plug Gap: 0.7-0.8 mm (0.028-0.031 in)
Valve Clearance (Intake): 0.23-0.27 mm (0.009-0.011 in) (cold)
Valve Clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 94 (Research method) / 89 AKI
| Powerhead |
The DF350AMD is built around a potent 4,390 cc V6 powerhead with a
narrow 55-degree bank angle, providing the tremendous torque essential
for pushing heavy loads efficiently. The block is engineered for high
performance and durability, utilizing advanced manufacturing techniques
throughout.
The powerhead incorporates a DOHC 24-valve configuration for optimal
airflow and combustion efficiency. The valve train is driven by a
self-adjusting oil-bathed timing chain with an automatic hydraulic
tensioner, providing maintenance-free operation for the engine's
lifetime and offering higher durability compared to belt-type systems.
The Variable Valve Timing (VVT) system, controlled by hydraulic pressure
from the oil pump, automatically optimizes intake valve timing depending
on engine operation, delivering smooth, powerful torque and tremendous
acceleration across all speed ranges.
The pistons undergo shot peening treatment, where metal balls are
projected onto the piston heads after casting, creating fine dimples
that distribute combustion pressure more evenly and preserve piston
integrity over the long term.
The offset driveshaft design positions the crankshaft in front of the driveshaft, moving the outboard's center of gravity forward. This configuration makes the outboard more compact, improves weight distribution on the boat's transom, and significantly reduces vibration by moving the engine's axis of inertia up over the upper engine mount.
| Fuel System |
0The DF350AMD's fuel system is centered around the Suzuki Lean Burn
Control System, an intelligent technology that continuously monitors
engine performance and operating conditions to optimize combustion.
Using a network of sensors measuring parameters such as engine load,
throttle opening, and environmental data, the system predicts with
extraordinary precision the amount of fuel needed for efficient
combustion. This results in significant fuel savings across a wide range
of operating conditions, particularly at cruising speeds, while also
decreasing CO2 emissions.
The Dual Injector System uses two injectors per cylinder to provide
immense precision, improved atomization, and increased fuel efficiency.
Injecting fuel achieves two critical functions: atomizing the fuel for
combustion and cooling the cylinder. The dual injector design atomizes
the fuel to enhance the cooling action in the combustion chamber and
suppress knocking, allowing Suzuki to increase power output.
The Multi-Point Sequential Electronic Fuel Injection system precisely
meters fuel to each cylinder for optimal combustion. A knock sensor
monitors combustion to provide optimized performance while maximizing
power output and increasing engine durability. The Direct Air Intake
system features a specially designed airflow path from the intake port
to the cylinder that suppresses any increase in intake temperature,
improving combustion efficiency and delivering higher power output from
the displacement.
| Lubrication System |
0The DF350AMD employs a trochoid pump pressure lubrication system to ensure consistent pressurized oil delivery to all critical engine components. The engine has an oil capacity of 8.0 liters. Recommended engine oil is high-quality 4-stroke motor oil meeting NMMA FC-W certification or API classification SG, SH, SJ, SL, SM, with viscosity SAE 10W-40 recommended for most conditions.
| Cooling System |
0Cooling efficiency is enhanced by a dual water inlet system, a critical
feature for high-performance operation. The system features water inlets
positioned to ensure a reliable amount of cooling water, especially at
high speeds. The redesigned gear case also incorporates improved water
flow management for optimal engine temperature control.
For post-operation maintenance, the Fresh Water Flushing System allows
easy connection of a garden hose to rinse salt, sand, and other debris
from the cooling passages, protecting the engine from corrosion. The
Suzuki Water Detecting System uses a water-detecting fuel filter to
alert the operator with both visual and audio warnings when water is
present in the fuel, preventing issues like poor combustion, lower power
output, and corrosion.
| Mid Section and Lower Unit |
The mid-section houses the integrated steering system, a groundbreaking
feature that places the steering cylinder within the mid-unit rather
than externally. This design eliminates clearance issues with the
motorwell, enables easier rigging to various boat types, prevents the
engine from hitting the motorwell when tilting up, and creates a
cleaner, simpler appearance.
The lower unit features a completely redesigned gear case that reduces
frontal projected area by 4 percent compared to the previous model. This
hydrodynamic design decreases water resistance, contributing to a top
speed increase of more than 2 percent according to Suzuki in-house
testing, and improved fuel efficiency.
The redesigned gear case also improves gear oil circulation through a
special oil passage, which suppresses temperature rise and increases
durability while reducing gear oil capacity from 3.2 liters to 2.8
liters. A new mechanism for changing gear oil allows oil changes without
lifting the vessel when using an oil changer.
The 2-Stage Gear Reduction system incorporates the offset driveshaft
with a first stage reduction between the crankshaft and driveshaft, and
a second stage reduction inside the gear case. This design makes the
2.29:1 gear ratio possible, allowing the engine to turn large diameter
propellers with tremendous power for quick acceleration and high
propulsive efficiency.
The Suzuki Dual Prop System features contra-rotating propellers that
provide more grip underwater and distribute engine torque evenly over
two propellers. This configuration reduces torque per propeller,
allowing gear diameter to be reduced and enabling a smaller, more
hydrodynamic gear case design.
Because each propeller rotates in a different direction, exceptional stability is achieved, and the contra-rotating propellers produce strong reverse thrust for superior maneuverability. The Watergrip Propeller, a stainless steel propeller with a new interchangeable square-shaped bush, offers efficient conversion of engine power to propulsion resulting in better grip and performance.
| Trim and Tilt System |
The Power Trim and Tilt (PTT) system provides hydraulic control over the outboard's angle, allowing the operator to adjust boat trim for optimal performance, fuel efficiency, and ride comfort. The system includes a Tilt Limit System that prevents the outboard from tilting beyond a predetermined angle, protecting both the engine and the boat from damage due to excessive tilting.
The Automatic Trim system, available when used with SMG4 or SMD multi-function gauges, automatically adjusts trim angle depending on engine RPM to help maintain the appropriate position, contributing to faster top speed and higher fuel efficiency.
| Propeller Information |
The DF350AMD is designed specifically for the Suzuki Dual Prop System featuring contra-rotating propellers. The recommended propeller pitch selection ranges from 12 inches to 31.5 inches. The propellers are designed to efficiently convert engine power into propulsion, and because each propeller rotates in a different direction, exceptional stability is achieved while producing strong reverse thrust.
| Dimensions and Weight |
Transom Height (Long Shaft - L): 508 mm (20 in)
Transom Height (Extra Long Shaft - X): 635 mm (25 in)
Transom Height (Extra Extra Long Shaft - XX): 762 mm (30 in)
Dry Weight (Long Shaft - L): 345 kg (760 lbs)
Dry Weight (Extra Long Shaft - X): 352 kg (775 lbs)
Dry Weight (Extra Extra Long Shaft - XX): 360 kg (793 lbs)
Engine Mounting: Shear mount system
| Maintenance Data |
Initial Service: Perform at 20 hours or 1 month
Engine Oil: Replace every 100 hours or 12 months
Engine Oil Capacity: 8.0 L (8.4 qt) with filter
Recommended Engine Oil: 4-stroke motor oil, NMMA FC-W oil, or API SG,
SH, SJ, SL, SM; SAE 10W-40
Gear Oil: Replace every 100 hours or 12 months
Gear Oil Capacity: 2.8 L (3.0 US qt)
Recommended Gear Oil: Suzuki Outboard Motor Gear Oil or API GL5, SAE 90
Hypoid gear oil
Spark Plugs: NGK DCPR6E. Inspect every 100 hours or 12 months
Spark Plug Gap: 0.7-0.8 mm (0.028-0.031 in)
Valve Clearance (Intake): 0.23-0.27 mm (0.009-0.011 in) (cold); inspect
every 300 hours or 36 months
Valve Clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold); inspect
every 300 hours or 36 months
Water Pump Impeller: Replace every 1000 hours
Low Pressure Fuel Filter: Replace every 400 hours or 2 years
External Anodes: Inspect every 100 hours or 12 months
Maintenance Features: The new gear case design allows oil changes
without lifting the boat by using an oil changer. The self-adjusting
timing chain is maintenance-free. The Suzuki Keyless Start System
features a water-resistant, floating remote FOB that disables the
immobilizer when within one meter of the console, serving as an
effective anti-theft device. The SDSM+ app enables checking engine
condition and operation tips, with the ability to scan QR codes
containing complete engine status information when used with Suzuki's
SMG4 multi-function gauge.
| Boat Applications |
Large Offshore Sports Fishing Boats: Ideal for large center consoles and sportfishing boats requiring powerful thrust for quick planing and exceptional handling in offshore conditions. Suzuki Marine offers a Stealth Line version with an all matte black finish and matching Chrome Black graphics, popular for performance pontoon boats, deck boats, and large offshore center consoles.
Expedition and Long-Range Vessels: The DF350AMD is available as part of Suzuki's flagship Geki series, designed for customers seeking the ultimate marine life experience. Superyacht Tenders: The Naumatec Freccia 800 superyacht tender is designed to be powered by the DF350AMD, demonstrating its suitability for premium tender applications.
Commercial Applications: Built for everyday use in commercial operations where reliability, durability, and fuel efficiency are paramount. Suzuki outboards are used by professional operators such as Sea Start and Solent RIB Charter, testament to their reliability.
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