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Seven Marine Changes the Game

DATE POSTED:June 25, 2019
Seven Marine’s powerful outboard engines are driving the center-console design game.
Seven Marine’s powerful outboard engines are driving the center-console design game. (Courtesy Seven Marine/)

One of the most ­striking sights at recent boat shows was HCB's 65 Estrella—the world's largest ­center-console—and her five Seven Marine 627sv outboards. These engines deliver 3,135 horsepower and, according to HCB, drive the boat at a 39-knot cruising speed and a 56-knot top speed.

While the 65 Estrella has plenty of innovative features, it’s those 627sv engines—the most powerful outboards available—that are driving the project’s success and ­sparking possibilities for other boatbuilders.

“The primary technology that sets ­Seven Marine’s outboards apart is that our powerhead is mounted horizontally, like a car, versus vertically, like a traditional outboard,” says Brian Davis, Seven Marine’s co-founder and vice president.

Davis says the hurdles in developing the 627sv were substantial: “We had to deliver big horsepower in an arrangement that can push big boats,” he says. Seven Marine employed GM’s 6.2-liter supercharged V-8 powerhead, moved the gear shifting from the engine’s lower unit to a ­dedicated transmission in its middle section, and developed a lower unit that efficiently transfers power to the water. “We utilized twin-pinion technology and sterndrive-type contra-­rotating duoprop technology,” Davis says, adding that this resulted in smaller-­diameter, lower-drag shafts and ­torpedoes.

Looking ahead, Davis envisions ­further developing the 627sv line while ­innovating new outboards. “Diesel and marine go together very well,” he says.

Take the next step: seven-marine.com