I recently purchased a 1978 Bayliner, Saratoga, 25 foot, with a retro fit diesel engine from a
Chevrolet Suburban. The Outdrive is a Volvo Penta 280 that has a short hub, left twist, 3 blade prop with 14" dia. and 19" pitch. I can only get 9+ knots from this setup at 3,100 RPM. Does anyone...