The intake air is free of moisture and never gets hotter than 10 degrees above ambient temperature. To help accomplish this, Suzuki engineers developed a dual louver system on the DF350A’s cowling, designing blades with a dogleg design to capture and deflect water particles away from the air in the intake flow. A high-compression ratio can often make an engine prone to knocking, so Suzuki developed new fuel-injection and air-intake systems to work with the high-compression ratio.Ī key to preventing knocking is keeping the air-fuel mixture cool and finely atomized when it’s injected into the cylinder. The solution was to increase the compression ratio to 12.0:1, the highest of any outboard motor. Suzuki’s goal with the DF350A was to develop 80 hp per liter, but a block with too much displacement would have meant more weight and the designers did not want to use a supercharger or turbocharger to boost the power. The DF350A features twin counter-rotating stainless-steel propellers and other innovations.
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