With a high focus on eco-friendly cars in an industry entailing increasing costs for sellers and buyers alike, car companies have begun using CNG or LPG kits in models that offer superior efficiency. Compressed Natural Gas (CNG) is a commercial fuel, whereas Liquefied Petroleum Gas (LPG) is used largely in homes.

Although CNG emits some Greenhouse Gases (GHG), it is a purified combustible gas and, thus, has fewer emissions compared to petrol and diesel cars. With CNG fuel, the car delivers better mileage and has a comparatively lower running cost. Considering the capacity of a standard CNG tank, it can store around 8-10 kg of gas.

On the other hand, LPG is regarded as one of the most commonly-used alternative fuels in India. LPG is basically a green gas and is considered as the third-most extensively used fuel throughout the world after petrol and diesel.

Among CNG and LPG kits, which is a preferable option to use in petrol cars?

Both fuel types have their advantages and disadvantages and, therefore, the best option depends on the requirements of the user. LPG’s advantage lies in its ease of installation, since the configuration of the car’s engine is not altered significantly. Secondly, the weight of an empty LPG cylinder ranges around 10-15 kg, whereas an empty CNG tank weighs around 45-50 kg. Considering the size, an LPG tank is more compact than that of CNG and, thus, leaves more space in the boot.

On the other hand CNG cars are more cost effective than LPG ones. If owners fit a CNG kit in their petrol or diesel cars, they can easily attain breakeven point in just two years by travelling just 15 km per day. In general, the running cost of petrol cars stands around Rs. 7.65 per km, which can be reduced to around Rs. 2.65 per km with the incorporation of CNG kit. Considering its drawbacks, one has to compromise to some extent with engine performance levels. An LPG-powered car in India delivers a mileage in the range of approximately 17-22 kmpl.

In case I have to fit a CNG or LPG kit in my petrol car, how many different types of kits are available in market?

Currently, there are three types of CNG and LPG kits available in the market with different packages, namely open loop, closed loop and sequential injection. Open loop is the most economical kit for CNG and LPG. These kits are based on a simple mechanism and do not contain any electronic components. Since both the fuels are purified gases, they hardly release harmful emissions in open loop configuration.

The second option available in market is closed loop, wherein the exhaustible gases are monitored by the sensors. In closed loop kits, the volume of gas intake by the engine for combustion is balanced in view of minimising pollutant emission levels. Besides the two afore mentioned options, buyers can also opt for sequential injection kit. Such kits work on advanced mechanism and functions in the same way that standard fuel injection system operate. In sequential injection kits, the emissions are controlled by the Engine Control Module (ECM).

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