The next generation of Suzuki 150- and 175-horsepower outboard motors feature an all-new powerhead designed to improve power and fuel efficiency. The new Suzuki DF150A, DF150SS and DF175A models were announced in October 2018 at the International Boatbuilders Exhibition and Conference (IBEX), a trade show in Tampa, Fla., and will have a public debut in February at the Miami International Boat Show. The motors have already begun to reach Suzuki Marine dealers.
The new models share an inline four-cylinder powerhead that displaces 2.8 liters (175 cubic inches), which is exactly the same displacement as the previous DF150/175 models. This powerhead first appeared in 2014 on the Suzuki DF200A, the first four-cylinder 200 from Suzuki, so this is sort of a trickle-down of that design to the 150/175 ratings. The engine features dual overhead camshafts and four valves per cylinder. Like the DF200A, the new DF175A features variable valve timing (VVT) that helps broaden the powerband. The VVT is not a feature of the DF150A. New cylinder heads bump up the compression ratio slightly, from 9.8:1 to 10.2:1, which should boost torque output. Suzuki claims a 2.7 percent increase in peak torque for the DF175A, and 2.1 percent for the DF150A. These motors have Suzuki’s offset shaft layout, with a gearset between the end of the crankshaft and the driveshaft, which shifts the weight of the powerhead forward slightly to reduce vibration to the boat, and with the lower gearcase allows a two-step gear reduction, with a low 2.29:1 final ratio.
This engine block accommodates an exhaust oxygen sensor and a knock sensor, key components of the Suzuki Lean Burn Control technology, which adjusts timing and fuel delivery to lean out the mixture at steady-state speed for a claimed 14 percent improvement in over-all fuel economy.
In the popular 150-horsepower class, the Suzuki DF150A will butt heads with the Mercury 150 FourStroke and the Yamaha F150. The new Suzuki weighs as little as 518 pounds (20” shaft length) compared to 456 pounds for the 3.0-liter Mercury 150 and 480 pounds for the 2.7-liter Yamaha F150, both of which are also four-cylinder engines.
The Suzuki DF150A/175A models are offered for either cable throttle-and-shift controls or, in the AP versions, set up for digital controls (the control unit is sold separately). Digital controls are available for the Yamaha F150 but not for the Mercury 150 FourStroke. The DF150SS features a hot rod matte black and red paint job. The DF150A and DF175A come in standard black or, for an additional $190, in a Cool White color. Pricing starts at $15,840 for the DF150A and $17,345 for the DF175A. Add about $1,200 for an AP version for digital controls.
NEW WHITE PORTABLE MODELS
Starting in early 2019, Suzuki will offer several of their popular portable models in “Cool White” color that’s a natural choice for use in salt water. Models include the DF6A, DF9.9B, DF15A and DF20A. With the addition of these models, Suzuki Marine now offers a choice of is standard black or Cool White color from 6 to 350 horsepower.
Looking for more on outboards? Read some of our latest features in our Engines & Parts reviews.