Cummins M-series engine

The Cummins M-series engine is a straight-six diesel engine designed and produced by Cummins. It displaces 10.8 litre. Introduced as the M11 in 1994, it was built on the previous L10 engine (same 4.921 in cylinder bore, but a longer 5.787 in piston stroke compared to the L10's 5.354 in stroke).

Later M11's received the electronic CELECT and CELECT Plus fuel systems consisting of a gear pump and solenoid controlled injectors. The M11 CELECT Plus became the ISM when Cummins applied its Interact System (hence the "IS" in ISM) to the M11 CELECT Plus in 1998 to further improve the engine. The ISM is available in four configurations, with slightly-different emphasis on maximum power (450 hp vs. 500 hp) and peak torque.

Applications

 * Large transit buses (40 feet and up).
 * Coaches
 * Large fire trucks
 * Heavy-duty trucks
 * Off-Highway (QSM11)

Popular power ratings

 * Urban bus
 * 925 lbfft @ 1200 rpm, 280 hp (209 kW) electronically governed at 2,100 rpm
 * 1150 lbfft @ 1200 rpm, 330 hp (246 kW) electronically governed at 2,100 rpm


 * RV, Truck, Motorcoach
 * 1050 lbfft @ 1200 rpm, 280 hp (209 kW) electronically governed at 2,100 rpm
 * 1150 lbfft @ 1200 rpm, 310 hp (246 kW) electronically governed at 2,100 rpm
 * 1250 lbfft @ 1200 rpm, 330 hp (209 kW) electronically governed at 2,100 rpm
 * 1350 lbfft @ 1200 rpm, 330 hp (246 kW) electronically governed at 2,100 rpm
 * 1350 lbfft @ 1200 rpm, 350 hp (209 kW) electronically governed at 2,100 rpm
 * 1350 lbfft @ 1200 rpm, 370 hp (246 kW) electronically governed at 2,100 rpm
 * 1450 lbfft @ 1200 rpm, 370 hp (246 kW) electronically governed at 2,100 rpm
 * 1450 lbfft @ 1200 rpm, 400 hp (246 kW) electronically governed at 2,100 rpm
 * 1550 lbfft @ 1200 rpm, 425 hp (246 kW) electronically governed at 2,100 rpm
 * 1450 lbfft @ 1200 rpm, 450 hp (246 kW) electronically governed at 2,100 rpm
 * 1550 lbfft @ 1200 rpm, 500 hp (246 kW) electronically governed at 2,100 rpm