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Scania gas engine - lower emissions, quieter operation
The gas engine is based on Scania’s dependable and highly appreciated 9-litre diesel engine, and it meets the Euro 3 exhaust emission standards. With the gas engine, Scania can offer a highly attractive alternative to operators who want low-emission engines for a variety of reasons.
There are already hundreds of gas-powered Scania buses on roads in Australia, and the preference for this type of engine is increasing considerably – especially in countries with plentiful supplies of CNG (Compressed Natural Gas).
Lower environmental impact
Compared to a diesel engine, a gas-powered engine makes less environmental impact. For instance, emissions of nitrogen oxides (NOx) can be cut by about two-thirds, and particulate emissions too are reduced dramatically. In order to reach the Euro 3 emission level for hydrocarbons (HC), the exhaust system has been equipped with a catalytic converter.
Mixing diesel-driven and gas-powered buses in the same fleet is no problem from the viewpoint of maintenance or service. Nor does daily operation involve any major adjustments from the viewpoint of driving method or operating reliability.
The technology
Scania’s 9-litre CNG engine works according to the Otto 4-stroke cycle. This means that the engine has a conventional ignition system with spark plugs and separate ignition coils for each cylinder, and it is fed with a mixture of fuel and air via a carburettor. |