A new engine BS 4 has recently launched with a 80% of system efficiency.BS is basically the emission standards given by Government of India to regulate the air pollutants coming from internal combustion engine. BS stands for Bharat Stage and are set by the central pollution control board. BS standard is generally applicable to all the vehicles that are running in the country.
You may have heard of other standards like Euro. in Europe and Tier 1, Tier 2, used in USA.
More the number assigned, less air polluting the engine or less pollutants, the engine is releasing. In India, the BS 4 Engines are applied for the NCR and some other cities while, BS 3 Engines are applied nation wide. Although, in coming years the BS4 engines will be applied nationwide i.e. the manufacturing of BS3 engines will stop.
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