Seven Marine introduced its new high-performance outboard, the 627, at the 2015 Miami International Boat Show. In besting its already impressive 557 by 70 horsepower (while using the same GM LSA 6.2-liter supercharged block), Seven Marine continues to carry the crown of "world's most powerful outboard."
The previous holder of the "world's most powerful outboard" title, the 557 had the boating industry abuzz when it was unwrapped at the 2011 Miami International Boat Show. GM's 6.2 L S/C LSA V8 from the Cadillac CTS-V provides the foundation of the motor that's rated at 557 horsepower and 550 pound-feet of torque.
Mercury Racing recently debuted its most powerful consumer engine to date in the 1550. This sterndrive features dual calibration technology where the user can get all 1,550 horsepower by running 112 AKI race fuel, or run 91 octane fuel and have 1,350 horsepower on tap.
300+ horsepower is fun when it's hanging off the transom. When it's installed within the body of Kawasaki's 310R PWC it'll have you grinning from ear to ear. The supercharged, inline four-cylinder produces 310 horsepower, and gets the Ultra 310LX and 310R across the water fast.
The QSM11 from Cummins is an inline, six-cylinder diesel with 10.8 L of displacement. It's capable of producing 300-715 horsepower and 1,160-1,750 pound-feet of torque. You can find the QSM11 on many express cruisers and sportfishing boats today.
MTU unveiled its new Series 2000 M96 engine at the 2014 Fort Lauderdale International Boat Show, and show-goers could experience its 2,600 horsepower firsthand aboard a Viking 92EB equipped with twin M96s. The 16-cylinder, 26.9L M96 features sequential turbocharging.
LEHR's 25-horsepower LP25 is currently the most powerful propane-powered outboard on the market.