Mack to Provide Waste Management Inc With 120 Natural-Gas-Powered Trucks

Mack Trucks Inc has reached an agreement with longtime customer Waste Management Inc that will put 120 natural gas-powered MackAE MR and LE Series trucks into service in Southern California.

The first vehicle has been delivered to the Waste Management facility in El Cajon CA, where the refuse hauler announced that it has joined forces with PG&E Corp to establish a program that will use emission reductions gained from the vehicles to pave the way for construction of a power plant in San Diego County. This is the first time that emission reductions from mobile sources have been used to offset emissions from a major stationary source.

Vehicles will be equipped with the new 12-liter Mack Eco-Tech engine. With 325 horsepower and 1,050 ft-lb of torque at 1250 rpm, these engines feature a spark-ignited design and operate on either liquefied or compressed natural gas (LNG or CNG). In order to meet emissions requirements requested by Waste Management, the engines had to meet an Environmental Protection Agency (EPA)-certified nitrogen oxide emissions level of 2.0 grams per brake horsepower-hour, which is 20% below the EPA requirement that will go into effect in 2002.

A total of 30 Mack LNG-powered vehicles will be delivered through this year, with Waste Management agreeing to purchase another 90 vehicles over the next two years.

The control system of the 12-liter Mack Eco-Tech engine, engineered to accommodate use of natural gas, consists of newly designed head and valve covers to incorporate centrally located spark plugs. Valve seats have been hardened to minimize valve recession; throttling losses have been reduced to improve part-load fuel economy; and a closed-loop, lean-burn control system enhances overall operation and response. When integrated into the Mack MR and LE chassis, the engine is fueled by two LNG tanks mounted on each side of the truck - one holding 100 gallons and the other holding 50 gallons. Waste Management also has the option to order a single LNG fuel tank that would be mounted to the left rail and store 150 gallons of fuel.

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