Cummins L Series engine

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Cummins L Series
Manufacturer Cummins
Also called L10, L10G, ISL, L Gas Plus, ISL G, ISL9
Production 1982-present
Combustion chamber
Configuration Straight-six diesel engine
Displacement 8.9 litres (543.1 cu in)
Cylinder block alloy Cast iron
Cylinder head alloy Cast iron
Turbocharger variable geometry turbocharger
Fuel type Diesel
Oil system Wet sump
Cooling system Water-cooled
Predecessor Cummins C8.3
Successor Cummins M11

The Cummins L Series engine is a straight-six diesel engine designed and produced by Cummins. It displaces 8.9 litres (543.1 cu in), and began production in 1982 as the L10. The engine was based on its 8.3 litres (506.5 cu in) predecessor, the Cummins C8.3 engine and which like the current ISL, had seen use in the applications listed above. It displaced 10.0 litres (610.2 cu in), and was available in either a vertical form, for upright use in trucks and buses, or horizontal form, for underfloor use in buses and trains. The L10 was Cummins first competitive offering in the British bus market, as their earlier production had been too large and heavy.[1] However, it had a troublesome introduction to the British market, with high oil consumption and sealing problems.[1]

By 1994, it had been developed into the M11, and in 1998, Cummins ceased production of the old L series engine. The L10 became the ISL when the Interact System was added.

The Cummins ISL also has a sister engine which is based on the existing ISL 8.9 litre cylinder block which runs on compressed natural gas (CNG).[2] The engine was introduced in 1992 as the L10G before being replaced by the L Gas Plus in 2001 until it became the ISL G in collaboration with Westport Innovations in 2008.

Popular power ratings[edit]

Urban bus[citation needed]
730 pound force-feet (990 N·m) @ 1300 rpm, 250 horsepower (186 kW; 253 PS) electronically governed at 2,200 rpm
900 pound force-feet (1,220 N·m) @ 1300 rpm, 280 horsepower (209 kW; 284 PS) (209 kW) electronically governed at 2,200 rpm
1,100 pound force-feet (1,491 N·m) @ 1300 rpm, 330 horsepower (246 kW; 335 PS) (246 kW) electronically governed at 2,200 rpm
Firetruck/Motorhome/Truck[citation needed]
1,050 pound force-feet (1,424 N·m) @ 1,300 rpm, 310 horsepower (231 kW; 314 PS) (231 kW) electronically governed at 2,100 rpm
1,150 pound force-feet (1,559 N·m) @ 1,300 rpm, 330 horsepower (246 kW; 335 PS) (246 kW) electronically governed at 2,100 rpm
1,200 pound force-feet (1,627 N·m) @ 1,300 rpm, 400 horsepower (298 kW; 406 PS) (298 kW) electronically governed at 2,200 rpm


  1. ^ a b Kennett, Pat (June 1986). "The Cummins Beat". TRUCK (London, UK: FF Publishing Ltd): 55–56. 
  2. ^

External links[edit]