The Volvo Penta D4-225 is a four-cylinder 3.7-liter engine ... In addition to the Volvo Penta diesel sterndrives, the 29 Defiant can be powered by twin outboards or inboards with water-jet drives.

Leveraging manufacturing -expertise and command of technology, Volvo Penta debuts upgraded D4 and D6 diesel engines, a new DPI sterndrive, an upgraded IPS drive, and a new generation of its Electronic ...