Yanmar Marine International will unveil a preproduction inline 6-cylinder common-rail diesel Sept. 8-13 at the Cannes Yachting Festival.
The 6LY440 — the first in a new series of common-rail diesels — is rated at 440 mhp at 3,300 rpm. It has a power-to-weight ratio of 1.7-to-1 (kW per kg), which Yanmar says gives it a significant advantage over the previous 6LY models.
"The engine is a development of the mechanically controlled 6LY2A engine series, which have sold in several thousands over the years, earning classic status among their many fans,” Yanmar assistant sales manager Wil Botman said in a statement. In fact, it uses the same narrow and lightweight LY2 block, which made it a favorite for installing in small, cramped engine rooms that are often found in boats designed for high top speeds."
However, just about everything else concerning the turbocharged 6LY engine is new, the company said. Single mechanical injector units are replaced by a Denso digital controlled common-rail fuel injection system with new pipe work designed to cope with higher injection pressures.
"The 24-valve cylinder head is all-new too, as is the newly designed inlet and exhaust manifold for optimal engine breathing to give high levels of torque throughout the entire speed range. And, of course, engine operation is fully digitally controlled," said Botman, making it ideal for fly-by-wire operation.
The 6LY440-CR will start to deliver early next year.