The Cummins M Series engine is a straight six diesel engine

Diesel engine

A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 designed and produced by Cummins

Cummins

Cummins Inc. is a Fortune 500 corporation that designs, manufactures, distributes and services engines and related technologies, including fuel systems, controls, air handling, filtration, emission control and electrical power generation systems...

. It displaces

Engine displacement

Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...

 10.8 litre. Introduced as the M11 in 1994, it was built on the previous L10

Cummins L Series engine

The Cummins ISL is a straight-six diesel engine designed and produced by Cummins. It displaces , and began production in 1998. The engine was based on its predecessor, the Cummins C8.3 engine....

 engine (same 4.921 inches (12.5 cm) cylinder bore, but a longer 5.787 inches (14.7 cm) piston stroke compared to the L10's 5.354 inches (13.6 cm) stroke).

In 1996, Cummins added electronic controls to improve efficiency. This model became known as the M11 Plus.

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

Power (physics)

In physics, power is the rate at which energy is transferred, used, or transformed. For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts—the more wattage, the more power, or equivalently the more electrical energy is used per unit...

 (450 hp vs. 500 hp) and peak torque

Torque

Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

.

Applications

• Large transit bus
  Transit bus
  A transit bus , also known as a commuter bus, city bus, or public bus, is a bus used for short-distance public transport purposes...
  
   (40 feet and up). Available on some 35 foot models.
• Large fire truck
• Heavy-duty truck

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

External links

• Cummins ISM at Cummins.com