Big Block—High Performance Engine
The new DF175AP/150AP development team based both of these latest generation Suzuki outboards on a big block inline four-cylinder four-stroke engine with a 2,867cm3 displacement. The block is topped with a DOHC powerhead that provides four-valves per cylinder for high performance. While the large displacement allows both to deliver exceptional acceleration and velocity, our engineers made sure that the outboard’s final dimensions are as compact and lightweight as possible. Both outboards feature some of the best of Suzuki’s advanced technologies that have been developed to extend engine performance.
Suzuki Selective Rotation
Large boats equipped with multi-outboard installations generally pair a standard rotation outboard with a counter-rotation model to keep the boat traveling in a straight line and on an even keel. Once requiring the purchase of a dedicated counter-rotation model, Suzuki’s innovative Suzuki Selective Rotation eliminates that need by incorporating a special, unified design of gears, shaft, and bearings in the lower unit that allow the outboard to operate reliably and efficiently in either direction. Available on both the DF175AP and DF150AP, counter-rotation operation requires an optional activation switch that connects to a circuit inside of the engine compartment plus the installation of a counterrotation propeller.
Multi-Stage Induction (MSI)
Multi-Stage Induction (MSI)Getting the right amount of air into the cylinder has a great impact on performance. High-speed operation typically requires a greater volume of air, low-speed less. Suzuki’s Multi-Stage Induction system meets these needs by utilising two intake manifold pipes per cylinder to ensure the engine gets the right amount of air. At low rpm, air enters the combustion chamber through a longer, curved manifold pipe designed to improve combustion and boost low end torque. As rpm increases, the valves open on the direct intake pipes. Shorter and lacking resistance, these pipes allow a greater volume of air into the chamber, increasing the engine’s ability to breathe efficiently at high rpm resulting in higher power output during high-speed operation.
High 10.2:1 Compression Ratio and Largest in Class Displacement
High 10.2:1 Compression Ratio and Largest in Class DisplacementCompression and displacement each play important roles in delivering performance and power output. Displacement has a direct effect on acceleration and torque so a bigger displacement is generally going to deliver more of both. Higher compression ratios allow the engine to get more output out of the combustion process resulting in noticeable improvements in performance and power. Drawing on our extensive motorsports experience and expertise in building race engines, Suzuki engineers have combined a 2,867cm3 displacement (the largest in each outboard’s class) with a high compression ratio of 10.2:1 to obtain great performance from these compact engines.
Semi-Direct Air Intake System
Semi-Direct Air Intake SystemUnderneath the modern upswept engine cover are a number of function-focused features that enhance engine performance. Both the DF175AP and DF150AP are equipped with a Semi-Direct Air Intake system that brings cooler air directly into the multi-stage induction module. Engines that breathe cooler air can operate more efficiently resulting in greater acceleration and top-end speed. Covers also have ports on the top that allow the rotating flywheel to push warm air inside of the cover to the outside helping to reduce temperature inside of the cover.
Suzuki Precision Control (Electronic Throttle and Shift System)
Suzuki Precision Control (Electronic Throttle and Shift System)Suzuki Precision Control is a technologically advanced computer based control system that replaces the mechanical control cables found in conventional control systems with electronic wiring that eliminates the source of friction and resistance. While you enjoy smooth, little friction throttle and shift operation, the system’s computer is processing and transmitting commands in real-time to actuators at the engine that deliver precise throttle controls with smoother, decisive shifting. This is most evident in the low rpm range where operation is noticeably smooth and accurate. When combined with Suzuki’s Lean Burn Control System it allows control of fuel and air flow to boost the limit of the controllable revolution range improving fuel economy over a wide operating range. Suzuki Precision Control also features built-in systems that help guard the engine and drive against damage due to mishandling, and its design and simple wiring make installation easy, reducing the time required for rigging and adjustment. The system offers precision control for single, twin, triple or quad installations as well as dual station operation
Suzuki Lean Burn Control System
Suzuki Lean Burn Control SystemThe Suzuki Lean Burn Control System is an intelligent fuel delivery system that achieves remarkable improvements in fuel consumption making fuel-efficient four-stroke outboards even more economical. Monitoring engine performance and operating conditions in real time, the system uses the 32-bit onboard ECM to predict fuel needs and deliver a leaner, more precise fuel mixture across the outboard’s operating range. The results show significant improvements in fuel economy across the entire powerband, including the cruising range where the engine is used a majority of the time.
Variable Valve Timing (VVT)
Variable Valve Timing (VVT)Variable Valve Timing is utilised on many of Suzuki’s high-end outboards to deliver high performance across the outboard’s full powerband while retaining the benefits that four-stroke technology provides. The system starts with an innovative cam profile designed for delivering maximum output and performance at high rpm.
Variable Valve Timing is used to vary intake timing with the camshaft to optimise 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.
O2 Sensor Feedback Control System
O2 Sensor Feedback Control SystemA key sensor in the electronic fuel injection system, the O2 Sensor Feedback Control system provides accurate, real-time information that the ECU uses to manage the fuel/air ratio as operating conditions change. Utilised on many of Suzuki’s high-end outboards, the O2 Sensor Feedback Control system helps maintain optimum engine operating efficiency across the engine’s full operating range.
ResonatorThe engine’s exhaust system is a well-known source of engine noise, but another, often overlooked source is the intake manifold. Air being sucked into the intake manifold at high velocities can generate a harsh sound. The DF175AP/DF150AP incorporate an air intake resonator that reduces such noise keeping operation exceptionally quiet.
Thrust Mount System
Thrust Mount SystemBoth the DF175AP and DF150AP incorporate a combination of soft type and high thrust rubber mounts on both upper and lower mounts to reduce engine vibration and provide stable operation. Soft type rubber mounts are used to absorb vibrations generated in the idling through 2,000 rpm range while high thrust rubber mounts deliver stable operation under high loads increasing power and performance.
Suzuki Keyless Start System
Suzuki Keyless Start SystemSuzuki’s Keyless Start system utilises a proximity key fob that transmits an access code to the engine’s starting system. As long as you have the key fob on your person, all you need to do is stand within one meter of the console, connect the emergency switch code, turn on the main switch, then start the outboard with a push of a button. With the key remaining safely in your pocket, the system offers simple, stress-free operation while reducing the risk of a lost key. The system also makes for an excellent theft deterrent since the outboard will not start without the proper access code. The key fob also floats so should it ever go overboard you can retrieve it.
Suzuki Water Detecting System
Suzuki Water Detecting SystemWater in the fuel can lead to problems that include poor combustion, lower power output, and corrosion. The Suzuki Water Detecting System is designed to help protect the engine from moisture in the fuel utilising a water detecting fuel filter to alert the operator with both visual and audio warnings when water is present in the fuel. The filter is also designed to let you check for water visually.
Dual Engine Flush Ports
Dual Engine Flush PortsOver time, salt, sand, and dirt build-up can restrict flow in the cooling system causing damage. To help prevent such build-up, both outboards are equipped with two freshwater flush ports that make flushing the cooling system as easy as possible. With one port located on the port side of the down housing and a second on the front panel, you’ll always have easy access to the flushing system whether the boat is in or out of the water.
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|Recommended Transom Height||X: 635mm|
|Valve Train||DOHC 16-Valve|
|Control System||Digital (Drive-by-wire)|
|Recommended Fuel||RON91 / AKI87|
|Gear Ratio||2.50 : 1 (Two-stage gear reduction)|
|Exhaust||Through Prop Hub Exhaust|
|Engine Type||In-line 4 cylinder, 4-stroke|
|Fuel Delivery System||Electronic Fuel Injection|
|Bore X Stroke||97 x 97mm|
|Full Throttle Operating Range||5,500 - 6,100rpm|
|Oil Pan Capacity||8.0L|
|Fuel Tank Capacity (L)||-|
|Trim Method||Power Trim and Tilt|
|Propeller Selection (Pitch)||15" - 27.5" (R/R), 17" - 26" (C/R)|
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