Cummins L10G

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The Cummins L10G was the compressed natural gas (CNG) powered version of the Cummins L10. The L10G was was popular in CNG-powered transit buses. In 1985, Cummins, ORTECH International, Consumers Gas, and the Ontario ministries of Transportation and Energy worked together to adapt the L10 engine to run on natural gas. The new L10G was made commercially available in 1989. It achieved California Air Resources Board (CARB) certification in 1992.[1]

The engine uses larger amounts of air, in what is known as lean burn technology, to lower internal operating temperatures. This slows the formation of pollutants like nitrogen oxide. The fuel mixture burns about 200 to 300 degrees lower than than in conventional engines. The L10G is also equipped with a catalytic converter to control hydrocarbons.

The L10G was produced until 2000 and was eventually replaced with the introduction of the Cummins Westport C Gas Plus and Cummins Westport L Gas Plus in 2001.


  • L10-300G: 300 hp @ 2100 rpm, 900 lb-ft @ 1300 rpm, 2100 rpm[2]
  • L10-280G: 280 hp @ 2100 rpm, 900 lb-ft @ 1300 rpm, 2100 rpm[2]


  1. By Bill Shields Star,Business Editor. "Natural Gas Engine Runaway Winner in Pollution War." The Windsor Star: B1. Oct 05 1992. ProQuest. Web. 21 Dec. 2016.
  2. 2.0 2.1 Cummins Alternative Fuels Page (1997)

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Current products
Diesel B4.5 / B6.7 - L9 - X12 / X15
CNG B6.7N - ISB6.7 G - ISX12 G - ISX12N - L9N
Former products
Diesel ISB6.7 - ISL9 - ISX12 / ISX15 B5.9 - C8.3 - ISC - ISM - L10 - M11 - NH Series - VTB-903
CNG B5.9G - B Gas Plus - C8.3G - L10G - C Gas Plus - L Gas Plus - ISL G
Propane B LPG Plus