Seven 627sv the most powerful outboard produced in the world

The Seven 627sv is the most powerful outboard motor produced in the world with unparalleled power. In addition to the power it provides a torque capable of pushing ever larger and heavier boats with exceptional performance.

Made by Seven Marine, a small family-run American company born in 2010 that managed first with its 557 to build the most powerful outboard in the world of the 500 class with the amazing power of 557 hp and subsequently the 627 with a power that has no equal to 627 hp.

Everything stems from the need of Rick Davis founder and president of Seven Marine to start his own business after a long experience gained at Mercury Marine as engineering director.

His fixation was to offer the market an innovative high performance engine.

“It all started with a passion for changing and revolutionizing outboard motors by transforming them according to our idea,” says Rick Dav’s son Brian Davis.


With a development program of just 18 months, this company has managed to build, together with a highly qualified team of engineers and technicians and top-level companies, the first version of Seven 557 transforming a Cadillac Escalade car engine into an outboard engine , the first in the world with a horizontal axis, with electro-hydraulic clutch, complete with closed circuit cooling, the most advanced outboard in the world at that time.

Then, just 5 years after the development of the first model, Seven Marine made its first version of the 627 by breaking the unprecedented 600 hp wall.

“Five years ago we broke the 500 barrier with a 557 hp engine and now we are here to break the 600 hp barrier with a 627 hp outboard engine,” says Rick Davis.

The monobloc used to insert it in the marine unit of the Seven 627sv outboard is of General Motors origin the same used for the cars of the famous Cadillac CTS-V models and the Camaro ZL1 an updated model of a 6.162 liter V8.

The monobloc is made of aluminum, equipped with two valves per cylinder operated by a rod distribution and rocker arms with hydraulic tappets.

This engine produces 556 hp on cars but has been adapted to marine needs by integrating it with a supercharging system to increase its performance with a volumetric compressor with intercooler cooled with a closed circuit. In addition, the power that passes through the input shaft with a horizontal axis drops through a series of cascade gears and then on a ZF Marine inverter this transmission turns the power downwards and transfers it directly to the propeller axis through the rotation of the bevel gear found in the torpedo.

It is the only outboard transmission with electronically controlled hydraulic clutches that allows you to engage the forward and reverse gear withstanding the beauty of 627 hp with a maximum torque of 813 Nm at 550 rpm.

The ZF is available with different reduction ratios to better adapt to the various boats.

The ZF inverter is built in Arco in the province of Trento in Italy, where a factory of the German multinational company ZF is located, one of the most important in the world in the construction of transmission systems, which from the outset provides the American company Seven Marine with ‘ZF inverter for its outboard motors and over the years together they have gained a lot of experience in the sector.

The Seven Marine 627sv surprises for its size but also for its aesthetics, the grille, which contains an engine that weighs 497 kg, is customizable in colors. The latest version also includes a new grille, the SpectraBlade with integrated colored LEDs. “Bring lighting to the outboard hood for the first time. You can customize the lighting to suit the boat and mood, ”says Rick’s other son Eric.

In addition, the new radiator grille has a larger air intake at the top and the upper has been redesigned.

The improvements have not only affected the aesthetic aspect, the cooling circuit has been improved with specialized coolant that circulates through the engine keeping it fresh and clean. In addition, a new injection system has been installed, called Quick-Start, the noise has been reduced and more.

The 627 is classified as a high-end outboard, but this is not a limited production engine.
“Our engine is a production engine, has a nominal power of 89 octane and is intended for large boat owners who want to combine performance and luxury,” says Brian, who covers the role of operations and finance manager in the company.

Anyone who is a little boat expert knows that more power always has an increasing cost so if power increases prices as well. In fact, the price of the 557 is around 79,000 dollars, the new 627 costs around 90,000 dollars.

With these two models, Seven Marine is currently the manufacturer of the most powerful outboards on the market.

In 2017, Volvo Penta, the world leader in the supply of marine and industrial engines, strategically became the majority shareholder of Seven Marine which, according to the agreement reached, will however maintain its organization .

Seven Marine seems satisfied with this alliance that allows it to continue expanding and to take advantage of Volvo Penta’s global service network which is one of the largest and most important in the world.

In this regard, Nicola Pomi, Volvo Penta Sales Director for Italy, Spain and Portugal, commented on the agreement reached:

For us it is an important move. Thanks to this acquisition, Volvo Penta enters the world of outboards. This certainly puts us in a strategic position, a synergy is created between our products and those of Seven Marine, which thanks to our platform will be integrated into our system. The advantage is clear, with this agreement we are expanding the range “.

At the Miami International Boat Show 2019 Tiara Sport was the first shipyard to present the Volvo Penta and Seven Marine outboard package as well as those of Mercury and Yamaha as one of the three possible propulsion options for its new 38 LS yacht.

Tiara Sport is an associate of S2 Yachts, Inc., one of the oldest private shipyards in the United States, based in Holland (Michigan).

This optional package for the Tiara Sport 38 LS features two 6.2-liter Seven 527 V8 outboard engines with Volvo Penta DuoProp units together with a combination of Volvo Penta Easy Boating functions, such as driving and mooring with joysticks, state-of-the-art control with Glass Cockpit, dynamic positioning system, autopilot-joystick integration and Easy Connect remote connectivity, all connected together by the Volvo Penta EVC platform.

In this regard, Tom Slikkers, CEO and President of S2 Yachts, Inc. has made the following statement:

“Tiara has long been a partner of Volvo Penta, to be precise since 2004, when we collaborated to equip the Tiara Yachts 38 Open with the Volvo Penta IPS system. For our company, this new package is not only the most natural choice based on our previous relationship with the Volvo Penta team, but also the most appropriate solution for our Tiara Sport brand, which is growing rapidly. “

Ron Huibers, President and CEO of Volvo Penta of the Americas and President of the Seven Marine board of directors, made the following comments:

“Today with Tiara Sport we are launching the first fully integrated system for the propulsion of large yachts, able to combine the performance of the outboards and the characteristics of the inboard. This is a huge step forward towards a new definition of the possibilities offered by outboard technology today ”.

“The integrated outboard experience of Volvo Penta and Seven Marine is a fundamental milestone resulting from our strategic acquisition of Seven Marine in 2017. Our goal is to expand our technological platforms and offer cutting-edge solutions, regardless of the source of energy, to provide the desired power in the water “.

With a press release dated 06/11/2020, which froze all operators in the nautical sector, Volvo Penta announced that it intends to focus all its efforts on the development of inboard and sterndrive engines, with greater fuel efficiency and zero emissions thanks to to hybrid, electric and renewable fuels which represent the new direction.
As a result of this accelerated transformation journey, the company will suspend development of the outboard. Therefore, Volvo Penta will stop the sales and marketing of Seven Marine engines (from January 1, 2021), as well as gradually stop production once customer demand is met.
The company, however, will continue to support the current outboard customer base by taking full warranty and parts responsibility for products in the field. Regarding Heléne Mellquist, the new president of Volvo Penta who replaced Björn Ingemanson, who after a long and successful career in the Volvo Group retired in September 2020, released the following statement: “Volvo Penta expects the outboard segment to continue to be relevant to the maritime leisure market, but we believe our primary focus must be the indisputable need to drive advances in sustainable technology.
This is why, for the moment, the exploration of new technologies together with the development of our core business, such as Volvo Penta IPS and sterndrive, will be the focus of our efforts. ” The Volvo Penta IPS is not a simple engine but has become a complete propulsion system that allows a 30% reduction in fuel consumption and a huge decrease in exhaust emissions, greater comfort in navigation and greater maneuverability of the boat.
Evidently, the development of Seven Marine engines, the most technological and powerful outboards in the world, are not part of the current strategy of Volvo Penta’s company management, so production has been suspended.
Surely it will have been a difficult choice in a market that now prefers outboard engines. In fact, in recent years, we are witnessing a real revolution in the nautical sector because the outboard motors that until recently were used for boats with a maximum length of 10 meters are now used to equip much larger boats.

Power and control were the main elements that characterized the development of these engines first individually and then in multiple applications.
All electronically controlled power that allows not only to gain in performance, fuel consumption and acceleration but also in space on board.
Volvo Penta with Seven Marine outboards could certainly increase its ability to do business but evidently the green soul of the Company in line with its long-term goals which plan to produce zero-emission propulsion systems by 2050 through electricity, but also with hybrid and renewable fuels prevailed.

This post has been updated

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