Quote:
Originally Posted by serialk11r
Particulate filters yes, urea injection no. Excess air is mandatory at low load for compression ignition, making the urea injection necessary.
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Dedicated CNG engines like the Cummins L9N are spark ignition.
https://freightlinerads.azureedge.ne...2019-05-31.pdf
Quote:
CUMMINS ® WESTPORT L9N 8.9 LITER NATURAL GAS ENGINE
• Uses stoichiometrically-cooled EGR combustion
• EPA 2017 and CARB emissions standards compliant
• Available up to 320 HP, 1000 lb-ft torque
• No SCR aftertreatment system required
• Maintenance-free exhaust system
• No DPF regeneration, cleaning or replacement
• Spark-ignited
• Dedicated natural gas engine – no dual fuel
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