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Sep 23, 2014
- M 936 G gas engine: clean, efficient and quiet drive system
- OM 936 diesel engine: reduced emissions and fuel consumption
- Success story in many variants
As the Econic NGT (Natural Gas Technology), the Mercedes-Benz Econic specialising in waste collection and distribution is now equipped with the new M 936 G natural gas engine. This six-cylinder in-line unit delivers the same performance as a diesel engine while setting standards with respect to noise and exhaust emissions.
M 936 G gas engine: clean, efficient and quiet drive system
The M 936 G natural gas engine is based on the 7.7-litre OM 936 turbodiesel engine. As a mono-fuel engine, it runs on compressed natural gas (CNG) and has an output of 222 kW (302 hp) while delivering maximum torque of 1200 Nm. Figures like these, in combination with its impressive power delivery, place the single-stage turbocharged engine on a par with its diesel-powered counterpart. At the same time it sets new standards in terms of environmental compatibility, with CO2 emissions up to 20 percent below those of a diesel engine. Using biogas further improves the carbon footprint.
Specially matched to the needs of CNG operation
The cylinder block and cylinder head are the same, having merely been adapted for operation with CNG. Newly developed items are the turbocharger, charge-air ducting, ignition and mixture formation, including exhaust-gas recirculation. The ignition system in a natural-gas engine is identical to that in a petrol engine. The M 936 G uses spark plugs with pencil-type ignition coils. They are housed in the same space that originally accommodated the fuel injectors in the diesel engine. The piston crown now has a different geometry. The new natural gas engine operates with a stoichiometric combustion of Lambda = 1, like a modern petrol engine. This results in especially clean combustion allied to high power output and low pollutant emissions.
A turbocharger with asymmetrical turbine geometry ensures an excellent response from the engine while at the same time supplying the cooled exhaust gas recirculation. The usual particulate filter is omitted thanks to the practically soot-free combustion. As in a spark-ignition engine, emission control is by means of a three-way catalytic converter.
Over the entire engine speed range, the natural gas engine has an even lower noise level than the already quiet OM 936 diesel engine. Further advantages of the new gas drive system: The additional weight compared to diesel drive has been halved to only around 500 kg. This is due to new gas cylinders in carbon-fibre-encased rugged steel specially produced for a lightweight construction.
OM 936 diesel engine: reduced emissions and particle numbers
The diesel engine in the Econic boasts low emissions. The range features two six-cylinder engines from the OM 936 series with a basic output of 220 kW (299 hp) and top output of 260 kW (354 hp) respectively, and a displacement of 7.7 l.
For this reason, the powertrain in the Econic continues to include the Allison six-speed automatic transmission – there's hardly a more agreeable way to navigate in dense urban traffic. For the new generation of Econic, the transmission has been provided with new eco software, which saves fuel while at the same time increasing ride comfort.
Cab: modern design, ergonomic and perfect for the job
At the heart of the concept behind the Econic – a total of over 13,000 units have been produced since the model series was launched in 1998 – is the ergonomically low-entry and highly spacious cab with its single-step entrance. The Econic has long since been synonymous with consolidation and distribution operations.
The new interior layout is immediately obvious when entering the low-entry cab. The completely revised cockpit with a new multifunction steering wheel and individually placeable switches offer the driver ideal working conditions.
The relocation of the parking brake and transmission controls to the same height as the steering wheel makes them easier to use, safer and more ergonomic. There is added stowage space thanks to lockable stowage compartments above the front-passenger seats as well as cup holders in the centre console compartment. Behind the co-drivers' seats there is also space for up to three beverage bottles. More extensive insulation of the cab and engine tunnel ensures an even better working environment.
Success story in many variants
The Econic comes in the configurations 4x2, 6x4, 6x2/4, 8x4 and 8x4/2 with electrohydraulically and progressively steered trailing and leading axle in permissible gross weight ratings of 18 and 26 t. Customised variants, such as a four-axle triple variant (three axles at the rear) with a total weight of 32 t and the new 9 t trailing axle, are also available.
Uniform hole patterns in combination with a movable end cross member and rearranged components behind the cab result in improved body-mounting ability while providing extra implement-mounting space. The load capacity of the front axle has also been increased to 8 t.