If the engineers in white lab coats  at Steyr Motors continue on their quest, the venerable gasoline marine engine  may soon become extinct. The reason is as simple as the sea is salt. The Austrians build a 250 horsepower diesel in-line 6-cylinder marine diesel specifically designed to compete head-to-head with General Motors 5.0, 5.7 and 6.0 liter V-8  gas inboards and stern drives.

Turbocharged, inter-cooled and featuring two-stage fuel injectors, the new Steyr diesel builds more horsepower per cubic inch than ought to  be legal. At the same time, it sips fuel at a miserly rate. Best of all: Atypical for a diesel, it's not particularly heavy, thanks to  its high alloy, lightweight castings. Other good news, smoke and fumes are virtually nonexistent. The engine mates to a wide variety of transmissions, including direct-drive, horizontal, eight-degree down angle and 12-degree V-drive. It's also an appropriate choice for MerCruiser Bravo.

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