Suzuki unveils the Maximum 350 horsepower DF350A Outboard!
New Flagship Model Features Innovative Contra-Rotating Propellers, More Exclusive Features
Suzuki Marine, a leader in 4-stroke outboard technology and performance, is proud to introduce its newest model, the DF350A. At 350 horsepower, this V6 4-stroke is the largest, most powerful outboard Suzuki has built to date. In development for more than three years, it represents a significant milestone in both engineering and design.
“We have put a lot of work into this new outboard and we cannot wait to see how the market responds. We have watched with great interest as boats have gotten bigger, especially the center-console market,” said Yasuharu Osawa, Executive General Manager, Global Marine & Power Products Operation, Suzuki Motor Corporation. “Not only that, but we’ve seen an increasing preference for outboards on all kinds of boats that used to be exclusively stern drive or inboard. The time is ripe for this new outboard, and we think you’re going to love it.”
350 Horsepower And A 12.0:1 Compression Ratio
Suzuki engineers achieved 350 horsepower while still designing a compact, lightweight powerhead. The robust engine displacement of 4.4 litres is matched by a highperformance 12.0:1 compression ratio, the highest ever for a production outboard engine. A unique combination of cool air intake, dual fuel injectors and a strengthening of the pistons has virtually eliminated engine knock, a typical byproduct of high compression engines.
Suzuki Dual Louver System, Direct Air Intake
Suzuki engineers have designed an air intake system that allows the engine to draw in ample fresh air, while separating out water, spray and moisture. Dual louvers under the hood trap larger water droplets and then moisture as it enters the engine cowling, resulting in zero water intake during testing. In addition, intake air temperatures are, on average, 10º cooler than ambient, providing the combustion chamber with cooler, denser air for a more powerful cycle.
Two, smaller fuel injectors allow for precise injection of fuel to the centre of the combustion chamber, which avoids off-centre combustion – a major cause of knocking. In addition, because 100% of the fuel is injected into the cylinder at once, a degree of cooling is also obtained, providing up to 3% additional power without causing knocking.
Advanced Piston Technology
To achieve 350 horsepower, the surface of the piston needs to withstand added forces. In order to assure both performance and long life, Suzuki engineers switched from a standard heat treatment to “shot peening.” Shot peening, a more expensive process, creates fine dimples in the face of the piston that evenly distribute the pressure created during combustion. In addition, the connecting rods and hardware have been strengthened to handle the added loads.
Suzuki Dual Prop System
While contra-rotating propellers are not a new technology, they have never been successfully used on outboard motors until now. The DF350A’s dual propellers provide three key benefits, compact size, increased stability and greater “traction.”
Suzuki engineers spent many hours in computer simulation and on the water, knowing that reducing drag underwater would be essential to improving overall boat speed and performance.
Contra-rotating propellers also provide added surface area, for more stability and increased “traction” or grip underwater. (Think of the wide slicks on a drag racer as compared to typical tires.) This results in exceptional acceleration, or hole-shot, truer directional propulsion (eliminating steering torque), better than expected top speeds and incredible reverse thrust. Importantly, these benefits are apparent even on heavier boats with full loads of fuel, gear and people.
Proven Suzuki Technology
“While these new engines feature a lot of new and innovative technology, they also take advantage of Suzuki’s proven systems,” added Mr. Osawa. “We wouldn’t call them The Ultimate 4-Stroke Outboards without building in superior reliability and dependability over the long haul.”
The DF350A features Suzuki Precision Control, drive-by-wire throttle and shift controls. Skippers will appreciate smooth shifting, precision control of the throttle, not to mention easier rigging, especially when second stations are involved.
Like Suzuki’s other V6 outboards, the DF350A features Suzuki’s offset driveshaft engine layout, which allows for a more compact outboard and two-stage gear reduction. Two-stage gear reduction provides a larger reduction gear ratio (2.29:1) and more torque for quick acceleration, and improvements in top speed, as well. (It is worth noting that the DF350A can be mounted 27-inches on centre, so it will fit on more transoms, and take up less space in twin, triple and quad installations.)
The DF350A also takes advantage of Suzuki’s Lean Burn Control Technology, for improved fuel economy throughout the entire rpm range, and especially at cruising speed. Like all Suzuki 4stroke outboards, the DF350A is extraordinarily quiet at idle.
As you can see, the development of this new outboard has been driven by Suzuki’s belief that it is important to provide the market with more than just horsepower. While power and speed are critical factors, the added dimensions of efficiency, reliability and stability make the DF350A the Ultimate 4-Stroke Outboard.
“We’ve taken the time in the design process to come up with what we think is the Ultimate new outboard motor,” said Mr. Osawa. “The DF350A is ready to take on all the challenges and demands of today’s boats – and deliver a ‘wow’ to skippers who have been looking for new power to handle their bigger boats.”
The DF350A will be manufactured in Suzuki’s Toyokawa plant in Japan and will be available in the US in July, 2017 and worldwide later in the summer.
Offset drive shaft
The offset drive allows us to make our outboard engines smaller by moving the outboards centre of gravity forward, improving weight distribution, power output, balance and reduces vibration.
Lean Burn control system
Suzuki’s Lean Burn Fuel Control Technology predicts fuel needs according to operating conditions, then delivers the optimum fuel/air mixture to the engine resulting in greater fuel economy.
Variable Valve Timing (VVT)
The system is controlled by hydraulic pressure from the oil pump and the process happens automatically so all you have to do is enjoy the power and performance.
Contra-Rotating Dual Propeller
This new technology provides more grip underwater and because the contra-rotating propellers distribute the engine torque more evenly over the two propellers the torque per propeller decreases and gear diameter can be reduced.
Suzuki Precision Control
This technologically advanced system gives smooth, precise control with crisp, immediate shifting particularly at low revs when manoeuvring and helps improve fuel efficiency.
Direct Intake System
The Dual Louver System incorporate a double shield of blades – each one designed in a dog-led shape and results in eliminating water intake, even in the face of the most severe on the water testing. The outer blades removes the spray and drains the mist resulting in the intake air temperature being free of moisture and no higher than 10° above ambient.
Gear Case Design
An ergonomic case design adds to the outboards computational fluid dynamics designed to and development to minimize resistance and provide the most efficient flow of water to the propellers.
RELIABILITY, STABILITY, EFFICIENCY AND DESIGN
ULTRA ULTRA LONG
DRIVE BY WIRE
The Lean Burn Control System supplies the right fuel and air mixture depending on the navigation conditions.
- Significant improvement in fuel economy in all speed ranges especially at cruising speed.
- Fuel is saved and gasoline costs are cut thanks to improved fuel economy.
SELF-ADJUSTING TIMING CHAIN
The timing chain runs in an oil-bath so it never needs lubricating, and is equipped with an automatic hydraulic tensioner so it remains properly adjusted at all times.
- More durability compared to belt types of same class.
SUZUKI WATER DETECTING SYSTEM
It helps protect the engine from water in the fuel using a water detecting fuel filter to alert the operator with both visual and audio warnings when water is present in the fuel.
- Can avoid water in fuel, which can lead to issues like poor combustion, lower power output and corrosion.
SUZUKI PRECISION CONTROL (ELECTRONIC THROTTLE AND SHIFT SYSTEMS)
Operation from the remote control is delivered to outboard via an electric signal and not by the traditional mechanical control cables.
- Less friction and resistance compared to mechanical type that uses control cables.
- Quick and reliable operation.
- Lean Burn integration offers improved fuel efficiency.
|Shaft Length||X: 25″ / 638mm XX: 30″ / 762mm|
|Engine Type||V6 – 55-degree DOHC 24-Valve|
|Weight||X: 727 Ibs / 330 kg XX: 747 Ibs / 339 kg|
|Valve Train Drive||Chain with Variable Valve Timing|
|Fuel Delivery System||Electronic Fuel Injection|
|No. of Cylinders||6|
|Displacement||267.9 cu in / 4.390 litres|
|Bore x Stroke||3.74″ x 3.82″ / 98mm x 97mm|
|Maximum Output||350 HP / 257.4 kW|
|Full Throttle Operating Range||5,700 – 6,300 rpm|
|Oil Pan Capacity||8.5 quarts / 8.0 litres|
|Ignition System||Fully – transistorized|
|Engine Mounting||Shear Mount|
|Trim Method||Power Trim and Tilt|
|Gear Shift||F-N-R (Drive By Wire)|
|Exhaust||Through Prop Exhaust|
|Propeller Selection||Front: 3 x 15.5 x 19.5 – 31.5|
|(All Props Are 3-Blade)||Rear: 3 x 15.5 x 19.5 – 31.5|
50 YEARS EXPERIENCE
50 years of leading the way in innovation – from bringing the down thrust propeller system to market in 1965, to introducing the world’s first 300HP V6 4-Stroke outboard in 2006.
PEACE OF MIND
As well as offering a three-year leisure or 1-year commercial warranty on all of our 4-stroke outboards, we also have a nationwide network of Suzuki Authorised Dealers who are always on hand to provide support wherever you are, whenever you need it.
As every engine in our range is designed specifically for the rigours of marine use our 4-Stroke outboards provide quiet, fuel-efficient and reliable technology whilst delivering market-leading power and performance.