DRIVE BY WIRE SERIES

POWERFUL V6 & IN-LINE 4

DF325A

We are proud to introduce our NEW DF325A – an outboard that perfectly balances awesome power and thrust, with outstanding fuel-efficiency and trusted reliability all within a lightweight and stylish design.

FEATURES

91 RON FUEL

Our engineers set out to build a compact, lightweight outboard that combines the high power required, alongside the operating efficiencies that cannot be achieved by using technologies such as turbocharging or supercharging. Additionally, they set the goal of making the DF325A run on low octane, 91 RON fuel, which combined with legendary Suzuki reliability makes the outboard ideally suited for a wide variety of large boats around the world.

DF325A 1. เครื่องยนต์เรือ Outboard engine

12.0:1 COMPRESSION RATIO

Our solution to developing 80 horsepower per liter in a V6 350 horsepower engine was to increase the compression ratio to 12.0:1, the highest compression ratio ever for a production outboard engine. In order to make this work without knocking (a typical problem at this ratio), we developed systems to mix cooler air with well-atomized fuel to provide optimal conditions for complete, and controlled combustion.

DF325A 2. เครื่องยนต์เรือ Outboard engine

DIRECT INTAKE SYSTEM AND DUAL LOUVER SYSTEM

At high speed, water particles could be directed, trapped, and drained away.
Our experienced engineers worked on applying this theory to practice by increasing the intake flow to convert water vapor to particles and designing blades to capture and deflect those particles away from the intake flow. The Dual Louver System incorporates a double shield of blades, each one designed in a dog-leg shape. The outer row of blades removes the spray from the boat and the inner louvers capture and drain the remaining mist.
As a result, intake air temperature is free of moist and no higher than 10° above ambient

DF325A 3. เครื่องยนต์เรือ Outboard engine

DUAL INJECTORS

Injecting fuel does two things, it atomizes the fuel and, incidentally, it cools the cylinder to minimize knock. To achieve the power we wanted, we needed to inject 100% of the fuel into the cylinder all at once, at a precise time, and at a precise angle to both cool the cylinder and to allow combustion to take place in the center of the combustion chamber.
The new Dual Injector System using two smaller injectors provided the required precision as well as improved atomization, increasing output by 3% without causing knocking.

DF325A 4. เครื่องยนต์เรือ Outboard engine

CONTRA-ROTATING PROPELLER

The contra-rotating propeller provides more “grip” underwater, and because contra-rotating props distribute the engine torque evenly over two propellers, the torque per propeller decreases and gear diameter can be reduced. This makes a reduction in gear diameter possible, which could then lead to the design of a smaller, more hydrodynamic gear case.

DF325A 5. เครื่องยนต์เรือ Outboard engine

PROPELLER BLADE DESIGN

A new three-blade front/three-blade back propeller set-up was developed that provided improved performance on the water. This new set up provided not only the highest recorded speeds for the DF350A, but also delivered incredible acceleration, even under heavy load and at high rotation speeds.

DF325A 6. เครื่องยนต์เรือ Outboard engine

DUAL WATER INTAKES

On the DF325A, the best results were achieved when the main intake was positioned at the front of the gear case, with the secondary intake located just above the skeg. This was our ultimate solution to arranging the main and sub intakes as far apart from each other as possible, and designing them to ensure a reliable amount of cooling water, especially at high speeds.

DF325A 7. เครื่องยนต์เรือ Outboard engine

DESIGNING STRONGER REVERSE THRUST

The gear material was changed and heat treatment was added to endure the added thrust and inertial mass from the reverse thrust, which was stronger on a contra-rotating propeller. In addition, the reverse gear was moved above the cavitation plate and the position of the lower engine mounts was modified from parallel to V-shape to fit the reverse gear above the cavitation plate.

DF325A 8. เครื่องยนต์เรือ Outboard engine

BETTER STEERING IN ALL DIRECTIONS

Normally, when using multiple outboards a combination of standard and counter-rotating engines is mounted. The Suzuki Selective Rotation, available on our AP series outboards, eliminates the need for different models, as any model can be easily programmed to run in either direction. The DF325A’s contra-rotating propeller technology takes this process one step further by eliminating steering torque and maximizing true and straight propulsion forces.

DF325A 9. เครื่องยนต์เรือ Outboard engine

TECHNOLOGY

POWERFUL

FUEL EFFICIENT

RELIABLE

INNOVATIVE

Advanced Technology for Performance

SUZUKI DUAL PROP SYSTEM

The dual prop system efficiently turns 325 horsepower output into propulsion under water.
As an added benefit, because each propeller rotates in a different direction, exceptional stability is achieved.

DF325A 10. เครื่องยนต์เรือ Outboard engine

SUZUKI DUAL LOUVER SYSTEM

The DF325A is equipped with a double louver at the air intake to remove water from the air taken into cowl.
The double louver removes water from the air. Incorporating a direct intake system, Suzuki’s dual louver system contributes to higher engine output.

DF325A 11. เครื่องยนต์เรือ Outboard engine

DUAL INJECTOR

Dual injectors deliver just the right amount of fuel at just the right time into the cylinder.
This dual injector contributes to higher output and better fuel efficiency.

DF325A 12. เครื่องยนต์เรือ Outboard engine

OFFSET DRIVESHAFT

The Offset Driveshaft allows us to make our engines smaller by moving the outboard’s centre of gravity forward, while improving weight distribution, power output, balance and reducing vibration.

DF325A 13. เครื่องยนต์เรือ Outboard engine

2-STAGE GEAR REDUCTION

The DF325A outboard also incorporates a 2-Stage Gear Reduction which results in a large reduction gear ratio. It delivers powerful torque for quick acceleration and great top-end speed.

DF325A 14. เครื่องยนต์เรือ Outboard engine

DIRECT AIR INTAKE

A new engine cover design provides the direct intake system with a smoother, cooler flow of air boosting engine operating efficiency.

DF325A 15. เครื่องยนต์เรือ Outboard engine

LEAN BURN

Fuel efficiency matters whether you’re boating for pleasure or profit. Our Lean Burn Fuel Control Technology predicts fuel needs according to operating conditions, then delivers the optimum fuel/air mixture to the engine. The system is designed to save fuel both at low speeds and up into the cruising range.

DF325A 16. เครื่องยนต์เรือ Outboard engine

SUZUKI PRECISION CONTROL (ELECTRONIC THROTTLE AND SHIFT SYSTEM)

Our sophisticated drive-by-wire system eliminates the friction and resistance of mechanical control cables. This gives smooth, precise control with crisp, immediate shifting, particularly at low revs and when maneuvering. The system can be configured with single, twin or triple installations, and for dual stations. Combined with our Lean Burn Control System, it helps improve fuel efficiency over a wide operating range.

DF325A 17. เครื่องยนต์เรือ Outboard engine

VARIABLE VALVE TIMING SYSTEM (VVT)

Variable Valve Timing is used to vary intake timing with the camshaft to optimize timing for low to mid-range operation. This allows the engine to deliver maximum power output across its entire operating range producing greater low to mid-range torque for powerful acceleration. The entire process happens automatically leaving you to enjoy the power and performance.

DF325A 18. เครื่องยนต์เรือ Outboard engine

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. Simple, effective and maintenance-free.

DF325A 19. เครื่องยนต์เรือ Outboard engine

DUAL WATER INLET

The engine’s cooling system relies on water supplied through low water intakes located on the lower unit. Utilizing this dual low water inlet configuration increases water flow into the lower unit, delivering greater cooling efficiency. Positioning the forward inlet by the gear case nose delivers a greater water supply, especially at high speeds. The second inlet is also positioned lower allowing the DF350A to operate in shallow water.

DF325A 20. เครื่องยนต์เรือ Outboard engine

HIGH COMPRESSION RATIO

12.0:1(Maximum compression ratio of SUZUKI outboards) The high compression ratio generates impressive performance and power output from the engine’s 4390㎤ displacement.

DF325A 21. เครื่องยนต์เรือ Outboard engine

OIL FILTER

The location of oil filter is easy for maintenance.

DF325A 22. เครื่องยนต์เรือ Outboard engine

SPECIFICATIONS

MODELDF325A
RECOMMENDED TRANSOM HEIGHT mmX : 635 (25), XX : 762 (30)
STARTING SYSTEMElectric
WEIGHT kg *1X : 330 , XX : 339
ENGINE TYPEV6 – 55° DOHC 24-Valve
Valve Train DriveChain with Variable Valve Timing
FUEL DELIVERY SYSTEMElectronic Fuel Injection
NO. OF CYLINDERS6
PISTON DISPLACEMENT ㎤ (cu.in.)4,390 (267.9)
BORE × STROKE mm (in.)98 (3.74) x 97 (3.82)
MAXIMUM OUTPUT kW239.0 (325)
FULL THROTTLE OPERATING RANGE rpm5,300 – 6,300
STEERINGRemote
OIL PAN CAPACITY l (U.S./Imp. qt.)8.0
IGNITION SYSTEMFully-transistorized
ALTERNATOR12V 54A
ENGINE MOUNTINGShear Mount
TRIM METHODPower Trim and Tilt
GEAR RATIO2.29:1
GEAR SHIFTF-N-R (Drive-by-wire)
EXHAUSTThrough Prop Hub Exhaust
PROPELLER SELECTION (Pitch)*2
All propellers are the 3-blade type
FRONT: 3×15 1/2×15.5-31.5
REAR: 3×15 1/2×15.5-31.5

* 1 : Dry Weight : Including battery cable, not including propeller and engine oil.
* 2 : Please enquire at your local dealer for details of the propeller.

FEATURES​
TECHNOLOGY​
SPECIFICATIONS​
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2-STAGE GEAR REDUCTION

DF70A AND UP

EXPLANATION :

This system which incorporates the Offset Driveshaft features a first stage reduction between the crankshaft and drive shaft, and a second stage reduction inside the gear case. This design makes a larger gear ratio possible, allowing it to turn a large diameter propeller.

ADVANTAGE :

  • High propulsive efficiency with large diameter propeller.

  • Powerful navigation, maintaining propeller rotation even with a larger load.

  • Tremendous power to turn large diameter propellers, offering quick acceleration.

MODEL
DF70A/ 80A/90A
DF100A/ 115A/140A
DF150(AP)/ 175(AP)/ 200A(AP)
DF200/ 225/250
DF250AP/ 300AP
DF350A
GEAR RATIO
2.59:1
2.59:1
2.50:1
2.29:1
2.08:1
2.29:1

OFFSET DRIVESHAFT

DF70A AND UP

EXPLANATION :

The engine powerhead is positioned closer to the front, moving the outboard’s center of gravity forward.

ADVANTAGE :

  • Less vibration
  • More compact
  • Stable steering performance

VVT (VARIABLE VALVE TIMING)

DF150AP, DF175, DF175AP, DF200A, DF200AP, DF250, DF250AP, DF300AP, DF350A

EXPLANATION :

The Variable Valve Timing is used to control the open and close timing on the intake valve depending on the engine operation.

ADVANTAGE :

  • Offers smooth, powerful torque.
  • Provides tremendous acceleration during operation for all speed ranges.

LEAN BURN

DF9.9B AND UP (NOT INCLUDING DF150, DF175, DF200, DF225, DF250)

EXPLANATION :

The Lean Burn Control System supplies the right fuel and air mixture depending on the navigation conditions.

ADVANTAGE :

  • 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.

 

Uses 14% less fuel compared to the original DF300, mainly in the cruising range where the engine is used a majority of the time. Data used in this graph was obtained through in-house testing under uniformed conditions. Results will vary depending on operating conditions(boat design, size, weight, weather, etc).

 

 

SELF-ADJUSTING TIMING CHAIN

DF40A AND UP

EXPLANATION :

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.

ADVANTAGE :

  • More durability compared to belt types of same class.
  • Maintenance-free.

DUAL INJECTOR

Dual injectors deliver just the right amount of fuel at just the right time into the cylinder.
This dual injector contributes to higher output and better fuel efficiency.

SUZUKI DUAL LOUVER SYSTEM

The DF350A is equipped with a double louver at the air intake to remove water from the air taken into cowl.
The double louver removes water from the air. Incorporating a direct intake system, Suzuki’s dual louver system contributes to higher engine output.

SUZUKI DUAL PROP SYSTEM

The dual prop system efficiently turns 350 horsepower output into propulsion under water.
As an added benefit, because each propeller rotates in a different direction, exceptional stability is achieved.

DIRECT AIR INTAKE

A new engine cover design provides the direct intake system with a smoother, cooler flow of air boosting engine operating efficiency.

SUZUKI PRECISION CONTROL

(ELECTRONIC THROTTLE AND SHIFT SYSTEMS)

DF150AP, DF175AP, DF200AP, DF250AP, DF300AP, DF350A

EXPLANATION :

Operation from the remote control is delivered to outboard via an electric signal and not by the traditional mechanical control cables.

ADVANTAGE :

  • Less friction and resistance compared to mechanical type that uses actual control cables.
  • Quick and reliable operation.
  • Lean Burn integration offers improved fuel economy for a wide range of speed.