With fuel prices continuing to climb, high-performance boaters are turning to efficient, low-maintenance diesel power.  To prove the advantages over gas engines, a Nor-Tech 3900 Super Vee was outfitted with twin 480 hp Yanmar 6LY3-ETP diesel engines from Mastry Engine Center. The results from recent performance trials were remarkable.  Operating at 3,475 rpm, the engines propelled the Nor-Tech to a top speed of 80 mph.  At wide open throttle, each engine burned just 21.5 gallons per hour, realizing 2 mpg—impressive for an 11,000-lb. V-bottom. The Nor-Tech quickly came on plane in only 8.9 seconds and reached 56 mph in 20 seconds from idle.  It was able to run from 40 to 60 mph in an amazing 7.4 seconds. Covered by a comprehensive five-year warranty, the Yanmar 6LY3-ETP engines from Mastry were paired with Arneson ASD 8 surface drives with 31″-pitch, lab-finished Mercury CNC propellers.  Built to last, the 24-valve, 4-stroke, vertical, water-cooled engines feature advanced electronic control for maximum fuel efficiency. Mastry Engine Center is a leading source for innovative marine powertrain installations.  www.mastry.com