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Mercedes Upgrades Econic NGT Engine

August 29, 2014 in CNG, NGVs by Rich Piellisch  |  No Comments

Mercedes-Benz M 936 G for Special-Purpose Waste Collection

Mercedes-Benz in Stuttgart has released details about an improved engine for its Econic NGT natural gas truck, promoting the 7.7-liter, Euro VI-compliant, dedicated-natural gas M 936 G for special-purpose waste collection and short-radius distribution vehicles.

The new and improved 7.7-liter M 936 G engine from Mercedes-Benz is being promoted for Euro VI-compliant Econic NGT special-purpose waste collection vehicles.

The new and improved 7.7-liter M 936 G engine from Mercedes-Benz is being promoted for Euro VI-compliant Econic NGT special-purpose waste collection vehicles.

“The new six-cylinder in-line powerplant delivers the same performance as a diesel engine while at the same time setting a new benchmark in terms of noise and exhaust emissions,” the manufacturer says, providing a “clean, efficient and quiet drive for urban applications.”

Output is 302 horsepower. Carbon dioxide emissions are as much as 20% below those of the OM 936 turbodiesel engine on which the new natural gas engine is based.

Less Weight Means More Payload

Cylinder block and cylinder head are the same, says a release, “having merely been adapted to run on CNG.

Lightweight rail-mounted CNG cylinder arrays on Econic NGT Euro VI chassis helps improve payload capability.

Lightweight rail-mounted CNG cylinder arrays on Econic NGT Euro VI chassis helps improve payload capability.

“Newly developed, on the other hand, are the turbocharger, charge-air ducting, ignition and the entire mixture preparation, including exhaust-gas recirculation.” The stoichiometric M 936 G’s spark plugs are housed in the same space that originally accommodated the fuel injectors, with pencil-type ignition coils. “The piston combustion cavity has been given a new geometry for natural-gas operation,” Mercedes says.

External dimensions are unchanged. In addition to EGR, the M 936 G has a three-way catalytic converter.

Beverage Delivery and Airport Operations

Another advantage? The extra weight of the new engine compared with its diesel counterpart has been halved to just approximately 500 kilograms (1,100 pounds), making for a significant a payload increase.

Complementing refuse fleet suitability, Mercedes suggests that the low-entry cab Econic NGT be used for food and drinks delivery, by fire services as a vehicle with turntable ladder or for auxiliary fire-extinguishing. “In addition,” Mercedes says, “the Econic is successfully used as a tanker or catering vehicle at airports.

Waste Management has tested Econic NGT trucks with the 6.9-liter, dedicated-CNG Mercedes M 906 engine in Texas (F&F, April 29, 2013).


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Source: Mercedes-Benz (Stuttgart) with HHP Insight follow-up

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