DF350A - Suzuki Marine Engine

DF350A It’s no secret that there is a growing demand for more powerful outboard motors. These new outboards have, in turn, fueled a move to newer, larger boat designs that previously may have been powered by stern drive or inboard power. So, as more powerful outboards are introduced, the boats get bigger and as the boats get bigger, outboards are getting more muscular. Suzuki embarked on a major engineering expedition to build the Ultimate outboard motor. Is The Sky The Limit? Making more horsepower is no mystery. Increasing displacement, or the use of a turbocharger or supercharger, makes more horsepower. However, larger displacement engines typically burn more fuel, adding weight creates a wide range of problems for boats, and more complex mechanical components create reliability concerns. On top of all this, boat speed is ultimately limited by hull design, the hydrodynamics of the lower unit and propellers, and how the outboards are mounted. In developing our new DF350A, we started with a blank sheet of paper, and considered all these factors in our design and engineering. First, we looked at the traditional single propeller design. A single propeller creates forward thrust, to be sure, but also produces a significant amount of rotational energy as a byproduct. Was there a way we could convert this wasted energy into productive power and improve propeller efficiency? Secondly, the leading edge of the gear case disrupts the flow of water over the propeller. More power and torque require stronger, larger gears to transfer power from the driveshaft to the propeller shaft. This typically results in a larger gear case – and consequently, more disruption of the flow of water to the propeller. Could we design a lower unit that could house stronger gears and yet minimize the disruption of the flow of water to the propellers? Suzuki engineers labored mightily through years of computer simulations, trial and error, and on-water testing, to significantly improve the way an outboard converts engine power into underwater thrust. They have succeeded in this quest – and the result is a revolution in innovation. We call it Parting Seas (Geki kanji symbol..) 激 GEKI: PARTING SEAS A Force to Match the Power of Nature and the Sea Representing Suzuki’s Identity and Heritage A Symbol of Our Passion and Commitment to the Ultimate in Marine Innovation MOVIE GALLERY new | icon SUZUKI DF350 In Action DF350A image video new | icon SUZUKI DF350A, LET’S GO TO CATALINA! DF350A image video LAUNCH EVENT | Long Movie DF350A LAUNCH EVENT LAUNCH EVENT | Short Movie DF350A LAUNCH EVENT ENGLISH | Long Movie DF350A Promotional Video ENGLISH | Short Movie DF350A Promotional Video GERMAN | Long Movie DF350A Promotional Video GERMAN | Short Movie DF350A Promotional Video FRENCH | Long Movie DF350A Promotional Video FRENCH | Short Movie DF350A Promotional Video SPANISH | Long Movie DF350A Promotional Video SPANISH | Short Movie DF350A Promotional Video ITALIAN | Long Movie DF350A Promotional Video ITALIAN | Short Movie DF350A Promotional Video PHOTO GALLERY PRODUCT FEATURE FEATURE.01 FEATURE.02 FEATURE.03 FEATURE.04 FEATURE.05 FEATURE.06 FEATURE.07 FEATURE.08 FEATURE.08 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 DF350A’s contra-rotating propeller technology takes this process one step further by eliminating steering torque and maximizing true and straight propulsion forces. VOICE OF DEVELOPERS Katsuhiro FUKUDA Atsushi OHTANI Tetsushi Achiwa Shuichi Sugiyama Jiro Saiga Katsuhiro FUKUDA Chief Engineer Since the development of the world's first 300 horsepower 4-stroke outboard in 2006, DF300 has been brought up and trained by our customers to evolve into DF300AP, which is equipped with the Suzuki Lean Burn Control and Suzuki Selective Rotation systems. DF300 has been praised by customers for the reliability and durability, but meanwhile, there were many customers who demanded more power. In the development of DF350A, the scene I imagined first is our customers using DF300AP and shouting "Wow!" Suzuki's V6 engines have a narrow 55-degree bank angle, so the minimum interval is 27 inches when rigging two outboards. "Can you mount this engine on my boat?" "No. The engine got bigger as the horsepower increased. So, please buy a new boat." Such a response will let our fans down. The concept is a 350 horsepower engine that DF300AP users can rig easily on their boat. Then, V6 with a narrow 55-degree bank angle becomes our unavoidable condition. We planned to keep the bore pitch 108 mm to be the same as our reliable and durable DF300AP. This was the starting point of development. There were many challenges to overcome. First priority is power output. For that purpose, it is common to increase the displacement, but it decreases fuel economy and makes it difficult to realize the bore pitch of 108 mm. After repeated development test, we found that with displacement of up to 4.4 L, we can keep the engine as small as DF300AP. The layout was made possible, but to output 350 horsepower, the engine must produce 80 horsepower per liter. DF300AP has already achieved 75 horsepower per liter, but 80 horsepower per liter was uncharted territory for us. To achieve this, in any case, we must improve the combustion inside cylinders. Mr. Saiga lowered the intake temperature by means of a direct intake system with a dual louver to fulfill the requirement for more power. Mr. Achiwa optimized the shape of the combustion chamber to achieve the compression ratio of 12.0 with an outboard for the first time. I'm sure you will be excited at the sound of Suzuki from the dual louver. What about performance? Ordinary small displacement engines take longer time to start planing than large displacement engines. They also cannot accelerate sharply on demand. Mr. Sugiyama solved this problem by optimizing the shape of the gear case and using a contra-rotating propeller. You shall experience powerful acceleration you wouldn’t expect from a small displacement engines. Meanwhile, we achieved the fuel economy comparable to DF300AP thanks to the small displacement and lean burn control. Although using the same 55-degree bank, DF350A reflects 10 years of evolution in every detail. Even a single head bolt is newly designed. Suzuki outboards have been brought up by customers and continue to evolve at this time as well. We have kept you waiting for a very long time. We’re proud to say it’s finally here. Please experience Suzuki’s flagship model, which is worthy of being called the ultimate outboard motor. Atsushi OHTANI AWARD Winner of the 2017 NMMA Innovation Award IBEX Innovation Awards are the best awards in the marine technology, which are given to those new products in the marine industry that demonstrate distinctive technological innovations and deliver outstanding consumer benefits. The following features of the DF350A were valued for the receipt of the award: - The largest V6 engine displacement, at 4.4 liters - Suzuki Dual Prop System (for exceptional grip and acceleration) - Direct Air Intake & Dual Injector (for achieving high compression ratio and efficient combustion) - Dual Louver System (for efficiently separating air and water) - Low Fuel Consumption This is the ninth Innovation Award won by Suzuki outboards, which accredits our sophisticated technology. Eight of these awards have been for four-stroke outboard motors, which is the largest number of awards in the engine category of this industry. GOOD DESIGN AWARD 2017 This outboard motor is worthy of being called a flagship. It has a unified and sophisticated form, enwrapped in organic curves from the air intake to the propeller. The color and logo give a serene feel worthy of a flagship model that will grab attention. As for performance, stability is improved with the implementation of the rare dual propeller system. In terms of both design and engineering, this product represents a dynamic jump for Suzuki's outboard motors. About Good Design Award The Good Design Award is a comprehensive design-promotion system that picks good design out of a variety of unfolding phenomena, and aims to enrich our lives, industries, and society as a whole by highlighting and celebrating these works. It is hosted by the Japan Institute for Design Promotion, a public interest incorporated foundation. TECHNOLOGIES SUZUKI DUAL PROP SYSTEMSUZUKI DUAL PROP SYSTEM SUZUKI DUAL LOUVER SYSTEMSUZUKI DUAL LOUVER SYSTEM DUAL INJECTORDUAL INJECTOR OFFSET DRIVESHAFTOFFSET DRIVESHAFT 2-STAGE GEAR REDUCTION2-STAGE GEAR REDUCTION DIRECT AIR INTAKEDIRECT AIR INTAKE LEAN BURNLEAN BURN SUZUKI PRECISION CONTROLSUZUKI PRECISION CONTROL VARIABLE VALVE TIMING SYSTEMVARIABLE VALVE TIMING SYSTEM SELF-ADJUSTING TIMING CHAINSELF-ADJUSTING TIMING CHAIN DUAL WATER INLETNEW HIGH CONPRESSION RATIO OIL FILTER SPECIFICATIONS MODEL DF350A RECOMMENDED TRANSOM HEIGHT mm (in.) X : 635 (25)XX : 762 (30) STARTING SYSTEM Electric WEIGHT kg (Ibs.) *1 X : 330 (727)XX : 339 (747) ENGINE TYPE V6 - 55° DOHC 24-Valve Valve Train Drive Chain with Variable Valve Timing FUEL DELIVERY SYSTEM Electronic Fuel Injection NO. OF CYLINDERS 6 PISTON DISPLACEMENT ㎤ (cu.in.) 4,390 (267.9) BORE × STROKE mm (in.) 98 (3.74) x 97 (3.82) MAXIMUM OUTPUT kW (PS) 257.4 (350) FULL THROTTLE OPERATING RANGE rpm 5,700 - 6,300 STEERING Remote OIL PAN CAPACITY l (U.S./Imp. qt.) 8.0 (8.5) IGNITION SYSTEM Fully-transistorized ALTERNATOR 12V 54A ENGINE MOUNTING Shear Mount TRIM METHOD Power Trim and Tilt GEAR RATIO 2.29:1 GEAR SHIFT F-N-R (Drive-by-Wire) EXHAUST Through Prop Hub Exhaust PROPELLER SELECTION (Pitch) *2 All propellers are the 3-blade type FRONT: 3×15 1/2×19.5-31.5 REAR: 3×15 1/2×19.5-31.5 *1: Dry Weight: Including battery cable, not including propeller and engine oil. *2: Please inquire at your local dealer for details of the propeller.