BS4 Vs. BS6: Key Difference Between BSIV and BSVI Engine

The introduction of Bharat Stage 6 (BS6) is a major step taken by the Indian Ministry of Road Transport and Highway (MoRTH) to reduce emissions caused by all kinds of transport, including two-wheelers. However, both emission standards, BS4 and BS6, are introduced to lessen vehicle emissions and save the environment. Read the article below to learn the difference between BS4 and BS6 engine standards.

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How BS6 is Different from BS4?

The' BSES' stands for Bharat Stage Emission Standard.

BS6 is a significant step taken by the Indian government to reduce air pollution compared to BS4. The government mandated that all vehicles registered and sold after 1 April 2020 follow the BS6 compliant.

The government of India has introduced emission norms to reduce harmful gas emissions from different types of automobiles, including two-wheelers.

The Indian emission standard BSES is based on European emission regulation, commonly known as EURO 2, EURO 3, EURO 4, etc. It was introduced in India in 2000 with the moniker BSI (BS1). Further, in 2001, it was BSII (BS2), and in 2005, it was BSIII (BS3).

The fourth edition of BSIV (BS4) was introduced in 2017. With each passing emission norm, the rules became stricter than their predecessors.

Difference Between BS4 and BS6 Automobile Engine

The MoRTH sets pollution standards to regulate the air pollutants emitted by all motor vehicles due to the internal combustion of fuel in the engine. The key difference between BS4 and BS6 is the level of emission the government determines. According to MoRTH, the BS6 engines are substantially stricter than BS4.

To get a detailed idea, here is a table showing you a differentiation between BS6 and BS4 engines:

Point of Basis BS6 BS4
Sulphur Content Significantly cleaner than BS4 and releases less Sulphur. Higher Sulphur components lead to increased emissions and air pollutants.
NOx Emission Not more than 60 mg/km. Under BS4, it was 80mg/km.
Sulphur Concentration Reduced to five times. Currently, it is 10ppm. It was 50ppm, which was substantially higher.
Lubricating Characteristics Contains mimic Sulphur’s lubricating characteristics for better performance. Only real Sulphur is used, which emits more pollutants.
Onboard Diagnostic (OD) Available in BS6 Not available in BS4
Real Driving Emission Driving Emission Standards are strictly enforced in BS6 to track pollutant emissions in real-time situations. The real-time situation cannot be traced in BS4 engines.

BS6 and BS4 Engine Emission Levels

Here is a table below that highlights the changes in the emission levels of BS6 versus BS4 engine:

Type of Fuel Engine Pollutant Gases BS6 Emission Level BS4 Emission Level

Petrol Engine Vehicle

Particulate Matter (PM) <4.5mg/km> NIL
Nitrogen Oxide (NOx) <60mg> <80mg>


Diesel Engine Vehicle

Particulate Matter (PM) <4.5mg/km <25mg>
Nitrogen Oxide (NOx) <80mg> <250mg>
Hydrocarbons + Nitrogen Oxide (HC + NOx) 170mg/km <300mg>

How Does a BS6 Engine Work?

In the BS6 engine, the converter assists the Selective Catalytic Reduction (SCR) mechanism present in the Nitrogen Oxide to transform into Diatomic Nitrogen or H2O. In this, the SCR system uses fuel fumes fluid to minimize the NOx levels.

If the exhaust fumes come in contact with AdBlue liquid, the urea is transformed into CO2 or ammonia. The NOx is also transformed into nitrogen and water vapours, which helps minimize the emission.

Effect of BS6 Emission Norms on the Bike Performance

With the advancement in engine technology, BS6 has made significant improvements in every aspect. Under this norm, two-wheeler manufacturers must install gasoline injection systems to reduce toxic exhaust emissions.

As the BS6 bike engines are less powerful and more fuel-efficient, they have reduced environmental carbon emissions. Ultimately, this emission norm has improved the overall performance of a two-wheeler.

Conclusion

Moving to more rigorous pollution emission norms, the Indian government has implemented BS6 to reduce pollution levels and save our environment. If you plan to buy a new two-wheeler, ensure you will not substitute BS6 standards with its predecessors to save pennies. Moreover, get the right two-wheeler insurance online to cover your possessions from several unforeseen instances. To get the affordable bike insurance deals, you can visit Policybazaar.com and compare various bike insurance quotes online offered by various insurers.

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#Savings are based on the comparison between highest and the lowest premium for own damage cover (excluding add-on covers) provided by different insurance companies for the same vehicle with the same IDV and same NCB.

*TP price for less than 75 CC two-wheelers. All savings are provided by insurers as per IRDAI-approved insurance plan. Standard T&C apply.

*Rs 538/- per annum is the price for third party motor insurance for two wheelers of not more than 75cc (non-commercial and non-electric)

#Savings are based on the comparison between the highest and the lowest premium for own damage cover (excluding add-on covers) provided by different insurance companies for the same vehicle with the same IDV and same NCB.

*₹ 1.5 is the Comprehensive premium for a 2015 TVS XL Super 70cc, MH02(Mumbai) RTO with an IDV of ₹5,895 and NCB at 50%.

*Rs 457/- per annum (1.3/day) is the price for the third-party motor insurance for private electric two-wheelers of not more than 3KW (non-commercial). Premium is payable on an annual basis