AUGUST 10, 2012 — Yanmar is to display its new V-12 engine, the 12AY, at the upcoming SMM event in Hamburg, Germany, September 4-7.
Designed for easy installation and maintenance, the purpose-built 12AY is aimed at offshore support vessels, ferries, tugs, commercial fishing craft and other demanding applications.
Compliant with the latest IMO Tier II emissions regulations, the 12AY series has type approval by the six major classification societies.
A key element of the improved performance and efficiency compared to previous models is a new staggered injection nozzle and patented combustion chamber design. They allow a very wide rpm range with low fuel consumption and emissions.
The 40 L, 12-cylinder turbocharged diesel engine is available in five power ratings across three models. The 12AYM-WST models are available at 1,200 mhp (882 kW) at 1,850 rpm and 1,400 mhp (1,030 kW) at 1,900 rpm. The 12AYM-WET is available at 1,550 mhp (1,140 kW) at 1,840 rpm and 1,659 mhp (1,220 kW) at 1,900rpm. The 12AYM-WGT produces 1,822 mhp (1,340 kW) at 1,940 rpm.
A new V-cylinder block configuration offers improved rigidity compared to previous models, with inspection ports providing easy access to connecting rod assemblies. A mechanical engine governor control and Yanmar's own fuel system components further enhance reliability.