While aftermarket CNG conversions are not new, with the rise in fuel prices, there has been a noticeable spike in interest surrounding them. Although there are more factory-fitted CNG cars on the market than ever before, several models still do not give you the option. Not to mention, existing car owners are increasingly looking to convert their cars to CNG to reduce running costs. Naturally, this increased interest brings up several questions about the technology, the installation, the legalities and more. We thus teamed up with Lovato CNG’s authorised distributor in Maharashtra, Blue Drive Traders, as well as Lets Go CNG and its authorised installer in Mumbai, M.S Motors, to answer questions about CNG conversions. Know your CNG kit There are three broad types of kits available on the market today. The oldest is the Venturi type, typically used for cars that are Bharat Stage 3-compatible and older. These use a Venturi mixer, similar to a carburettor, that mixes CNG with air before it is injected into the intake manifold. They are the most affordable, usually costing between Rs 30,000 and Rs 40,000, including installation and registration, but they are not the most efficient and bring a significant drop in performance. Since the cars they are compatible with are also reaching the end of their lifecycle, these kits are gradually being phased out. Modern naturally aspirated MPFI cars require a sequential type kit. These use individual injectors that inject CNG directly into the intake manifold and feature their own ECU that controls timing, volume and other parameters based on RPM and driver inputs. These are much more fuel-efficient, and the drop in performance is nominal in everyday driving conditions. Like the older Venturi kits, these too require the car to be started on petrol before switching over to CNG. However,