When Mercury Marine released its range of supercharged four-stroke multipoint EFI outboards motors some years ago, it created a unique niche in the market for boaters wanting DFI two-stroke performance from a four-stroke outboard.

And the Mercury Verado 175 is no exception — its combination of holeshot performance and bottom-end to mid-range fuel efficiency are simply unmatched by any other four-stroke 175 on the market.

Verado 175 From Mercury Marine

The Mercury Verado 175 has standard features such as integrated power steering and DTS (“fly-by-wire”). The standard SmartCraft instrumentation, which has digital rev rate, speed, fuel flow and range-to-empty functions, is also very user-friendly. While the powerhead is a supercharged version of the naturally aspirated four-stroke Mercury F115 outboard, the piston displacement is the smallest of any 175 hp outboard on the Aussie market. Yet because of the electronically-managed supercharger with charge air-cooling and electronic boost control, at low rev rates the Mercury Verado 175 uses little more fuel than the F115.

Because the Verado 175 uses substantially more fuel above 4000rpm than its direct two, or four-stroke low-emission competition, it has an OEDA “2 Star” exhaust emissions rating.

The hydrocarbon and oxides of nitrogen emissions are only 15.4g/kW/hr (grams per kilowatt hour), although its carbon monoxide emissions are a whopping 336g/kW/hr. Powerhead access is very good for such a complex engine, with the sump oil level dipstick, spark plugs (with integrated ignition coils in the caps), and belt-driven alternator easily reached. Mercury Marine recommends servicing intervals are every 100 hours or annually after the first 20 hours or three months. The recreational usage warranty is five years provided servicing is undertaken by an authorised Mercury Marine service centre.

 Performance and Fuel Economy

The reviewed Mercury Verado 175 outboard was mounted on a Stacer 589 Easy Rider bowrider supplied by NSW Central Coast Stacer dealer, In-Tune Marine.

It was factory-approved to 175 hp, and the review extra-long shaft Mercury Verado 175 was perfectly matched to this hull. The engine started instantly hot or cold with no oil smoke appearing, and power astern was very good, provided the antiventilation plate was kept at least three-quarters immersed.

The power steering and DTS combination gave precise control at low speeds, which was very handy in a tight access channel with a stiff crosswind at the launching ramp.

Spinning a 19in pitch stainless steel Quicksilver Vengeance prop and pushing 1400kg including three adults, the 175 trolled us at an almost vibration-free 1.6kts (3.0kmh) and 680rpm using a mere 1.4lt/h. At 1000rpm the averages were 3.2kts (6.0kmh) and 2.6lt/h, while at 2000rpm we averaged 5.4kts (10.0kmh) and 6.5lt/h.

A clean plane was achieved at 12.4 kts (23.0 kmh) with a minimum planing cruise speed of 14.0 kts (26.0kmh) at 3000 rpm using only 13.0 lt/h. At this rev rate, there was still no boost from the supercharger, and the engine was incredibly quiet.

Only when the throttle lever was “floored” from a trolling rev rate was a noticeable whine from the supercharger as we planed in a mere 2.5 seconds. And we achieved maximum speed in 15 seconds. Yikes!

The maximum planing fuel efficiency zone for the Mercury Verado 175 is from 3000 to 4000 rpm. At 4000 rpm, the averages were 22.5 kts (45.0kmh) using 22.5 lt/h with the same fuel efficiency as at 3000 rpm. There was some prop ventilation through tight figure-of-eight turns at 4000 rpm, but this was quickly eliminated by dropping the rev rate and heading in a straight line.

At 5000 rpm (my recommended maximum four-stroke cruising rev range), the averages were 58.0 km (31.3 kts) and 40.0 lt/h. With the leg trimmed well out at WOT, we averaged 41.5 kts (77.0 km) and 6330 rpm using 67.5 lt/h. Despite the supercharger whine, we could still talk normally at the helm at WOT, again with hardly any vibration from the engine.

I must confess, I’ve long preferred DFI two-strokes to four-strokes in outboards over 100 hp. However, in my opinion, the combination of holeshot performance, quietness, and great fuel efficiency up to 4000 rpm makes the Mercury Verado 175 the only real competition to the E-TEC 175 and Mercury OptiMax 175.

 

Best Features

• Blistering holeshot and top-end performance.

• Very quiet running.

• Power steering.

• Excellent low-speed to mid-range fuel efficiency.

• Digital Throttle and Shifting (DTS).

 

Competing Outboard Motors (Extra Long Models)

 

Honda BF175

Suzuki DF175

Weight

267kg

215kg

Warranty

5 years

5 years

OEDA Stars

3

3

 

Ready to Set Sail? 

Find your dream boat online at Only Boats! We have great deals on boats for sale, including used boats and new boats. You can also check out our used boat buying guide.

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This article was written by Andrew Norton and previously appeared at TradeaBoat.com.au, now powered by Only Boats.

 


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