Mack Develops Low NOx Solution for CARB Idling Restrictions

MACK MP7 and MP8 engines have been certified to meet California's 2008 criteria to limit emissions of nitrogen oxides (NOx) while idling. This means Mack customers with compliant engines will not have to shut down their engines after five minutes of idling as otherwise required by California regulations, which took effect earlier this year.

The California Air Resources Board requires trucks to stop idling after no more than five minutes, under most circumstances. However, trucks with engines which emit 30 grams or less per hour of NOx are not required to shut down and can continue to idle, which can be necessary to provide a comfortable environment for resting drivers in hot or cold weather. Several other states intend to pursue adoption of California's idle regulations in the near future.

Customers now have the option to specify "Idle Emission Certification - CARB 08" for Mack MP Series engines built after January 1, 2008. This feature means the truck's engine has been certified to meet the 30 gram/hour NOx limit. A CARB-required decal affixed to its hood identifies the truck as meeting the regulation. The new Mack MP10 engine will also be able to meet this standard when it goes into production later this year. Mack customers can order this feature from their dealers now.

"This feature gives Mack drivers the ability to idle their engines as needed, while still emitting extremely low levels of NOx," said David McKenna, Mack powertrain sales & marketing manager. "Our customers know not to idle unnecessarily, but they will be pleased with having this option for those times when idling is necessary. And Mack MP engines are designed to be very fuel efficient while idling."

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