Yanmar Marine announced the second in its new SY-STP series of big-capacity diesel engines for high performance cruisers and motor yachts, this time at 900 hp. The 16-liter Yanmar 8SY-STP is a 90 degree V8, designed for more power with less weight, maximized torque at low revs, improved fuel economy, reduced emissions and simplified servicing. Optimum fuel flow is created with twin turbochargers, charge-air cooling, individual cylinders with four-valve technology and an engine block where fuel supply takes place on the cooler side. Electronic fuel injectors allow the amount of diesel injected and its timing to be controlled precisely, from cold starting to idling and through to open-throttle performance. This is designed to result in higher power outputs, lower fuel consumption and less visible exhaust smoke.
The engine has an electronic engine management system, monitoring and processing data such as engine speed, boost pressure, coolant temperature and throttle setting. The system adjusts injection timing and the amount of fuel injected in response to changing operating conditions, maximizing power and efficiency. Its communications area network (CAN) protocol permits a total overview of the engine data in real time.
The 8SY-STP is approximately 3,637 pounds fully equipped. It features individual cylinder heads that offer substantial weight savings and are light enough to be lifted and reinserted by just one person. Together with modular design for fewer maintenance operations, electronic diagnostics and easily accessible service points, routine engine care is simple and economical. The engine measures 51-in. long x 49-in. wide x 42-in. high. It facilitates easy front-end mounting of power take-offs for other engine-driven equipment. Fresh water is used to cool the entire engine and for the charge-air cooling, which has an extra circuit to provide the coolest possible intake air.