Abstract
In the first and deliberate departure from its long-held pulse-turbocharging principle, Mitsubishi Heavy Industries has recently devised a constant-pressure turbocharged, long-stroke, low-speed UE-H marine diesel engine. Except for the supercharging and exhaust-scavenging systems and specially modified few components, the H type retains the proven design of the two-stage turbocharged E type to assure high reliability and yet offers an extremely low specific fuel consumption. In total, nine UEC52/125H and UEC60/150H engines have already been manufactured and shop-tested and their performances were proven good. A thorough fuel consumption test with a 6UEC52/125H unit of 8, 000 bhp at 150 rev/min registered a specific fuel consumption of as low as 136 g/bhph at 100 per cent load. Accordingly, guaranteed specific fuel consumptions of UE-H type engines have officially been decreased and that of UEC52/125H is 138 g/ps⋅h.
