Cummins M Series engine

Cummins M Series

Manufacturer	Cummins
Also called	M11, M11 Plus, ISM
Production	1994-
Predecessor	Cummins L Series engine
Configuration	Straight six diesel engine
Displacement	10.8 litres (659.1 cu in)
Cylinder bore	4.921 inches (125.0 mm)
Piston stroke	5.787 inches (147.0 mm)
Cylinder block alloy	Cast iron
Cylinder head alloy	Cast iron
Turbocharger	Holset Variable Geometry Turbocharger
Fuel type	Diesel
Oil system	Wet sump
Cooling system	Water cooled

The Cummins M Series engine is a straight six diesel engine designed and produced by Cummins. It displaces 10.8 litres (659.1 cu in). Introduced as the M11 in 1994, it was built on the previous L10 engine (same 4.921 inches (125.0 mm) cylinder bore, but a longer 5.787 inches (147.0 mm) piston stroke compared to the L10's 5.354 inches (136.0 mm) stroke).

In 1996, Cummins added electronic controls to improve efficiency. This model became known as the M11 Plus.^{[citation needed]}

The M11 Plus became the ISM when Cummins applied its Interact System (hence the "IS" in ISM) to the M11 Plus to further improve the engine. The ISM is available in four different configurations, with slightly different emphasis on maximum power (450 horsepower (336 kW; 456 PS) vs. 500 horsepower (373 kW; 507 PS)) and peak torque.

Applications

• Large transit bus (40 feet and up).^[1] Available on some 35 foot models.^{[citation needed]}
• Large fire truck^[1]
• Heavy-duty truck^[1]

Popular power ratings

Urban bus

925 pound force-feet (1,254 N·m) @ 1200 rpm, 280 horsepower (209 kW; 284 PS) (209 kW) electronically governed at 2,100 rpm

1,150 pound force-feet (1,559 N·m) @ 1200 rpm, 330 horsepower (246 kW; 335 PS) (246 kW) electronically governed at 2,100 rpm

RV, Truck, Motorcoach

1,050 pound force-feet (1,424 N·m) @ 1200 rpm, 280 horsepower (209 kW; 284 PS) (209 kW) electronically governed at 2,100 rpm

1,150 pound force-feet (1,559 N·m) @ 1200 rpm, 310 horsepower (231 kW; 314 PS) (246 kW) electronically governed at 2,100 rpm

1,250 pound force-feet (1,695 N·m) @ 1200 rpm, 330 horsepower (246 kW; 335 PS) (209 kW) electronically governed at 2,100 rpm

1,350 pound force-feet (1,830 N·m) @ 1200 rpm, 330 horsepower (246 kW; 335 PS) (246 kW) electronically governed at 2,100 rpm

1,350 pound force-feet (1,830 N·m) @ 1200 rpm, 350 horsepower (261 kW; 355 PS) (209 kW) electronically governed at 2,100 rpm

1,350 pound force-feet (1,830 N·m) @ 1200 rpm, 370 horsepower (276 kW; 375 PS) (246 kW) electronically governed at 2,100 rpm

1,450 pound force-feet (1,966 N·m) @ 1200 rpm, 370 horsepower (276 kW; 375 PS) (246 kW) electronically governed at 2,100 rpm

1,450 pound force-feet (1,966 N·m) @ 1200 rpm, 400 horsepower (298 kW; 406 PS) (246 kW) electronically governed at 2,100 rpm

1,550 pound force-feet (2,102 N·m) @ 1200 rpm, 425 horsepower (317 kW; 431 PS) (246 kW) electronically governed at 2,100 rpm

1,450 pound force-feet (1,966 N·m) @ 1200 rpm, 450 horsepower (336 kW; 456 PS) (246 kW) electronically governed at 2,100 rpm

1,550 pound force-feet (2,102 N·m) @ 1200 rpm, 500 horsepower (373 kW; 507 PS) (246 kW) electronically governed at 2,100 rpm

References

1. ^ ^{a b c} Cummins engine ratings, Cummins website, 2009, accessed 2010-08-18.

External links

• Cummins ISM^{[dead link]} at Cummins.com