Frequently Asked Question (FAQs)

CNG is currently regarded as the cleanest alternative fuel. In comparison to gasoline and diesel fumes, gas fumes contain less carbon dioxide (10­-15 %), carbon monoxide ( 20%) and hydrocarbons (55­-60%) The elimination of harmful benzene, lead compounds and sulphates is dedicated to healthcare and environmental awareness.
Definately yes. Its abundant, affordable and relatively clean. LPG/CNG installation is an investment that always pays off. The refund will be made in a shorter or longer period of time depending on the distances you cover and price of fuel in your city. For exact figures please visit our Savings calculator to know your monthly savings.
Yes, almost all types of Petrol driven vehicles can be converted to run on CNG without modification to the engine. Yes there would be different types of kits for Carburetor, SFI, MPFI or Turbo, TSI engines but they can all be converted to alternate fuel using necessary equipment successfully. Please contact us with your vehicle type to get a FREE advice on the correct CNG or LPG kit for your car.
The engine of the vehicle remains unchanged with change of fuel. With CNG there is a slight increase in engine temperature of the car which can easily be taken care by the efficient cooling system of a modern car. Installing add on’s like the JLM Valve Saver can help safeguard and extend the engine life on CNG/LPG and is highly recommended.
Not really. Your car’s maintenance remains the same as earlier. You simply need to ensure a clean air filter element and good condition of the ignition systems vis the Spark Plugs, HT cables or ignition coils as you need a strong spark to ignite the alternate fuels. Your oil change interval is actually enhanced due to no splashing effect on CNG/LPG and also the oil remains much cleaner due no reduced hydrocarbons or no sulhur content in alternate fuel.
As a thumb rule, vehicles running on CNG have a 40-50% increment in mileage. for example, a car giving a mileage of 10km/ltr of petrol can be expected to deliver 15km per Kg of CNG. However, in case of LPG there is a reduction of 10% on mileage per litre, so the same car in our eg. may deliver an efficiency of 9km /ltr of Autogas. The efficiency of the system also depends on the engine conditions, maintenance and calibration of the vehicle. Please visit our blog to read more about increasing mileage of CNG cars.
A venturi or traditional system as its commonly called is like a Carburetor car. The Gas is mixed along the air stream via a mixer which restricts the flow of air to the engine. This may cause performance issues specially in Petrol as well as uncontrolled amount of fuel air ratio going to the engine may cause performance drops, lower mileage or drivability. This is more pronounced in modern cars with feedback control devices or multiple catalytic convertors.

In comparision, a Sequential Gas Injection System is similar to a MPFI petrol car. The gas is injected to each and every cylinder of the car just before the combustion chamber via gas injectors. The gas injection is controlled via a Gas ECM which is programmed via software and follows the petrol ECU’s sequence and injection timing by using a multiplier for gas to deliver a petrol like performance and ensuring emisions are kept to minimum. This system also ensures all car parameters and feedback control devices are running as per manufacturer’s defined limits ensuring good performance and higher mileage as the precise dosing of gas fuel is ensured. These systems also eliminate the risk of backfires which can be quite detremental specially in a plastic intake manifold common in most BS-IV upwards cars and is an expensive part to replace.

In lastest generation cars, with Turbo Direct Injection on Petrol (eg. TSI engines) , its also possible to use Direct Injection on gas where the fuel is directly injected in combustion chamber for a much superior performance. We are one of the first companies to launch this technology in India !

Almost ! In case of CNG, owing to natural property of the fuel (takes time to burn) there would be a slight drop in max speed and time taken to achieve it. However with a finely calibrated car and a good system like our EVO SUPERIOR kit which has a Variable Timing Advancer to advance the timing of ignition at different load conditions, you would not feel noticeable difference in the peformance in a day to day drive. Matching of fuel trims from OBDII parameters of the car also ensures that optimum fuel air ratio is maintained in the engine while running on CNG. The Octane number of CNG is 127, which means you would have enough power generated from the car running on CNG.

We also advice to switch to BRISK Silver CNG Spark plugs which emit strong sparks to ignite hard to ignite fuels like CNG – compared to a conventional copper spark plug.(see With our factory trained and highly experienced and updated installers, we ensure that you get the correct advice, perfect products for your car’s engine and a higher fitment standards ensuring safety and performance.

Power and performance has always been a highlight of using LPG in a car being a liquid fuel when stored and turns to vapor when released. Both CNG and LPG (110 RON) have higher octane numbers than petrol and are thus known to have lower knock and proper combustion than premium grade Petrol.

On Board Diagnostics (OBD) is a protocol used in all cars after 1996 which monitors the electronic sensors of engines and emission control systems, including the catalytic converter, while the vehicle is being driven to ensure they are working as designed by the manufacturer. In case of any error, the CHECK ENGINE / MIL light glows on the car’s dashboard to alert the driver. This error can be checked by the workshop with a scan tool which connects to the OBD port in the car to diagnose and correct the error. The code would be denoted in form of a alphanumeric number which was later standardized by the automotive industry.

With OBD-II, all car manufacturers would follow a similar set of codes and have a similar port, making it possible for the workshop to scan the car with a common scan tool or software. The difference over OBDI is that in OBDII there would be real time data meaning faster diagnostics and more efficient remedies can be provided for the problems faced in a vehicle.

All cars made in India after 1st April 2013 are compulsorily OBDII compliant. Using an OBD-I CNG Kit is not legal in such cars and may cause the MIL/CHECK ENGINE light to come on while running on CNG/LPG besides seriously damaging your car’s engine. It is recommended to use an OBD-II CNG/LPG kit on such cars to avoid check engine lights which would only come on when there is an actual problem in the car.

For more info on OBD please read our blog.OBDII port

Yes. Your car’s AC runs the same as it does on Petrol. You are only using an alternate fuel to power the engine, whether its CNG or LPG, the AC is powered by a compressor driven via a belt from the engine – so using any fuel is not going to make any difference to it.

Further there is no odour in CNG and when it burns there is no smell coming in the car. Likewise in LPG, the tank is housed in a vacum tight housing, so there are no fumes and odour inside the car. There is also no odour in the exhaust of the car.

CNG tanks are available in different sizes. Most common are 60 Ltr and 65 ltr water capacity. In 60 Ltr WC tank, which is 12kg total capacity (max refilling is 10 kgs) , the amount of gas going in depends upon the pressure at the filling station. Ideally at 200 bars, you can refill about 8-9 kgs of gas which should last anything from 120-180 kms depending upon the car’s mileage. Remember, on 1 kg of CNG, your car’s mileage is approx 40 % more than what is achieved on 1ltr of petrol.
As important it is to select good components for your kit, quality in fitment is equally important. For proper functioning of the CNG run car and ensuring a petrol like performance you need to have an installer who is educated, well trained, and experienced on handling Automobiles, CNG Kits and calibration.

In the modern OBDII systems or Direct injection systems, your installer should have indepth knowledge about the car’s parameters as he needs to ensure that the fuel trims on CNG are matched with that on Petrol to avoid any malfunction/check engine lights in dashboard from the OBD.

Most users of CNG face issues of poor pick up, drag, Check Lights, jerks, irratic idling etc – a majority of which can be attributed to poor quality components and poor fitment.

At EVO our installers and calibrators are skilled, trained in Europe with years of experience in installation and handling LPG /CNG vehicles. All our dealers in India are trained as a prerequisite on starting an association with us.

When you get an EVO Kit for your car, you are in safe hands, we set higher fitting & service levels.

One you get your RC book updated from your local RTO for use of CNG as a fuel besides petrol, there is no limit to the life of CNG kit which is as long as validity of your RC.

However, every three years, the CNG cylinder is required to be tested for Hydrostatic pressure test to ensure validity of the storage cylinder installed in the car for your safety.

CNG and LPG are safer than Petrol or diesel as a fuel. CNG is in gaseous state and lighter than air. So in case of a leakage it dissipates into the atmosphere very fast and would not ignite at that concentration and temperature. The ignition temperature of CNG is almost twice than that of petrol (595 centrigrade for CNG copared to 315 centigrade of Petrol). So this kind of ignition temp. can only be achieved inside the combustion chamber of the engine. In eventuality of a leakage, if CNG’s concentration in the air is less than 5% and more than 15%, the gas will not burn even in the presence of spark.

Morever, the tanks are made of seamless steel tubes which can withstand pressures upto 700 bars i.e 3 times the working pressure and are fitted with Cylinder valves which have burst discs that vent out the gas in case of pressure or temperature built up in the tank making it absolutely safe.

Likewise for LPG the tanks are high quality steel which do not crack up or deform and fitted with a vaccum tight housing which lets all fumes outside the car’s cabin in case of any leakage or pressure built up. The LPG tanks are fitted with MULTIVALVE which does not allow more than 80% of the total tank capacity to be filled leaving space for expansion of gas in heat. This valve has a thermofuse, a pressure relief valve, a manual closure valve, and solenoid which trips in case of excess pressure flow or impact.

Unlike Petrol or Diesel these fuels do not ignite with engine heat in case of any accident of the car or spilling which would never happen in CNG or LPG.

Yes. Depending upon your car’s make and year (different emission norms like BS-2, BS-3, BS-4 onwards), you can get CNG updated along with Petrol in the Registeration Book of your car. After RC updation, you can also inform your insurance company about installation of CNG with a copy of updated RC and CNG kit invoice to update the insurance cover with CNG making you fully covered for any risk even after installing of CNG. Care should be taken that you keep a copy of invoice and also get the installation done from an authorised and approved workshop.
Not really, most manufacturers do not cover the warranty of the kit if they are not installing the CNG kit themselves and they may not warrant anything which gets affected by the installation of CNG. When you get an installation done from EVO AUTOGAS or our authorised service points, we ensure that there is no disturbance to the vehicle or its engine whatsoever. Also our wiring installation is socket type and all wiring used are approved by iCAT / ARAI in India and there are no loose ends making it absolutely safe for your car.

Further, we ensure that there are no check engine lights due to CNG installations. Most car manufacturers workshops decline warranty when they see permanent Check engine lights after CNG installations which is a sign of imperfect system and mismatch fuel trims. The disadvantage of this is that in case of an actual trouble in the car you would not know if there is anything wrong in the vehicle which would have needed immediate attention and required a visit to the workshop. In most cases, the damage would have already been done with a permanent CHECK LIGHT glowing after CNG installation.

Hence, such imperfect installations would surely void your car warranty.

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