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 Suzuki engineers designed a 4.0-liter V6 engine—the largest displacement found in the industry thus far—with an aggressive cam profile that delivers maximum output and performance at high rpm. In coupling this cam profile with Suzuki’s advanced Variable Valve Timing (VVT), the DF300 delivers the additional torque that outboards need for accelerating in the low to mid-range. VVT achieves this by adjusting the timing of the intake valves, allowing them to open before the exhaust valves are fully closed, creating a momentary overlap in the timing where both sets of valves are open. Using VVT, this overlap can be increased or decreased by altering intake timing with the camshaft resulting in optimum timing for low and mid-range operation.
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 Suzuki Precision Control offers boaters the latest in technologically advanced control systems. The core of the system is a sophisticated computer-based control system that does away with the mechanical cables found in conventional control systems, replacing them with electronic wiring that eliminates the source of friction and resistance. While you enjoy smooth, friction free throttle operation, the system’s computer is processing and transmitting commands in real-time to actuators at the engine that do all of the physical work, delivering precise throttle control with smoother, decisive shifting. This is most evident in the low rpm range where operation is noticeably smooth and accurate. 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 triple installation as well as dual station operation.
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 Another performance enhancing feature on the DF300 is a long track intake manifold. Using long intake pipes with an inline layout tuned to smooth airflow into the engine the system provides the DF300 with enhanced power.
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 The gear case on the DF300 has a new hydrodynamic design that reduces drag created as the lower unit moves through the water. This contributes to faster acceleration and increased speed.
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 The DF300 is designed with a large air induction port to maximize airflow into the engine in order to obtain maximum power output. The increased airflow produces more low- to mid-range torque and provides a wide powerband that is necessary in an outboard engine. Suzuki also designed the system with a water separator, which aids in keeping water out of the electronic throttle body and a heat shield to keep intake air from being heated by the engine.
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 A spherical bore throttle body smoothes the characteristically turbulently airflow into the engine that occurs as the throttle begins to open. Providing a smoother airflow during acceleration results in improved throttle control and stable engine operation at low rpm.
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The cooler the fuel the denser it is, and the denser it is the better performance it delivers. Incorporating a fuel cooler in the DF300’s fuel delivery system cools the fuel before it enters the engine. Providing the engine with an optimum fuel supply results in better combustion and performance. |
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