Cat has just introduced new engines for recreational power boats from 25 to 60 feet – most of the power cruising market – with a lot of advantages in a relatively small footprint. The C7.1 engines are in-line 6-cylinder, four-stroke diesels that are turbocharged and after-cooled, and they come in 406-, 456- and 507-hp versions. The engines’ advanced common rail fuel system delivers optimum combustion and low emissions; they are quiet because of reduced combustion through advanced electronic controls. They also are smokeless, both when starting and underway. With a superior power-to-weight ratio, the C7.1 engines have a swift response…