WHAT’S CNG FUEL?
CNG (Compressed Natural Gas) is the methane, the hydrocarbon of which the mix called Natural Gas is almost entirely composed by.
WHICH ARE THE PECULIAR CHARACTERISTICS OF CNG VEHICLES SUPPLY?
CNG is an excellent fuel for controlled ignition engines, which allows achieving excellent performances, low consumptions, very low polluting emissions, almost total absence of carbon residuals inside the engine, and reduced noise of the vehicle. Thanks to its molecular structure, CNG allows increasing energetic efficiency and reducing consumptions.
HOW MANY VEHICLES SUPPLIED WITH CNG MOVE IN ITALY?
Recent sector estimates indicate that CNG vehicles are roughly 382.000. In 2007, in Italy, 30.000 CNG supply systems have been installed in After Market.
HOW THE CNG VEHICLE IS REFUELLED AND HOW LONG DOES REFUELLING TAKE?
A CNG vehicle is refuelled by means of the connection of the pump hose with the vehicle refuelling point, normally inside the engine compartment or near the petrol refuelling point, and of a pipe bringing CNG in pressure to the cylinders (normally situated in the luggage van).
In a modern service station equipped with weight pumps, this operation may take 2/3 minutes, for a medium vehicle (80-100 lt cylinder).
ONE KILO OF CNG IS EQUAL TO HOW MUCH PETROL?
One kilo of CNG is equal to roughly 1,5 litres of petrol.
ONE CUBIC METRE OF CNG IS EQUAL TO HOW MUCH PETROL?
One metre of CNG is equal to roughly 1,1 litres of petrol.
WHY VEHICLE AUTONOMY CAN CHANGE FROM A FILLING UP TO ANOTHER ONE?
Run difference between two different fillings up depends on the driving style, of course, but also on the quantity of fuel supplied.
Also engine efficiency and atmospheric parameters (pressure and air humidity) influence the engine performance. Especially, not being liquid, the supplied fuel quantity doesn’t depends only on tank volume (that’s to say on the cylinders capacity in litres) but on pressure and temperature achieved at the end of charge too; so, fuel quantity supplied with the filling can change a little for every single case (on the other hand, it happens the same for liquid fuels, just in a less sensible way). Another important factor (that determines the supplied fuel quantity) concerns supplied gas features (see following question).
WHY PRICE TO PAY CAN CHANGE FROM A SERVICE STATION TO ANOTHER ONE WITH THE SAME FILLING UP?
It’s completely normal in the gas transport network that two different stations, or the same station in two different times, had gases coming from different sources, and so with a different composition. For example, a gas coming from Italy is lighter than a gas coming from Algeria; so, this difference could influence gas kilos supplied and price to pay.
But we have to consider that a heavier gas contains higher energy, and this allows having longer vehicle runs.
WHAT AUTONOMY HAS A VEHICLE CONVERTED WITH CNG SYSTEM?
If we divide by four the total capacity of installed cylinders (expressed in litres), we obtain (with a good approximation) the equivalent CNG cubic meters contained in the tank.
For example in a 80 lt cylinder we have roughly 20 lt of equivalent CNG cubic meters.
If we imagine running on average 14 km with a CNG cubic meter (equal to run roughly 12,5 km/lt with petrol), autonomy will be roughly of 280 km.
IS IT TRUE THAT CNG SYSTEM CAN DAMAGE THE ENGINE?
CNG system damages by no means the right engine working, on the contrary it extends its life.
CAN I CONVERT TO CNG THE VEHICLE…TURBO…CATALYTIC…3 OR 8 CYLINDERS?
BRC Gas Equipment has CNG supply systems compatibles and homologated with almost all kind of motorisation presents on the market. So we can convert to CNG, with no technical problems, almost all vehicles originally supplied with petrol, both with carburettor, and with catalytic injection or not, and supercharged.
We suggest any way to address yourself to a BRC workshop, which will verify in detail your engine type and will give you specific information.
CAN I INSTALL CNG SYSTEM ON AN ESTATE CAR OR ON A MINIVAN?
Yes, circular 58 of 30 april 1996 allows it..
WHAT’S THE POWER LOSS OF AN ENGINE CONVERTED TO CNG?
For the most advanced systems (BRC SEQUENT phased sequential multipoint gas injection) difference in performances during practical use of the vehicle is almost undetectable, whereas it becomes bigger in case of more obsolete systems (mix traditional system), especially if not equipped with time advancer electronic systems.
DESPITE THE LPG ECONOMIC AND ECOLOGIC POSITIVE ASPECTS, THE LUGGAGE VAN SPACE BECOMES LOWER?
Above all, we have to underline that you can install on your car more than a CNG cylinder. In this way, optimising your choice according to the car luggage van, you’ll obtain high space saving without penalize too much CNG tank capacity.
DO CNG SYSTEMS NEED A SPECIFIC MAINTENANCE?
They don’t need a specific maintenance, we suggest following the programmed one.
WHICH IS APPROXIMATELY CNG PRICE?
CNG supplied by refuelling station for cars is measured in kilograms. A kilo of CNG (data taken in September 2008) costs on average 0,890 Euro/kg. Instead, a litre of unleaded petrol costs on average 1,430 Euro/l.
For a more realistic and meaningful comparison, we has to consider that a kilo of CNG is almost equal to 1,5 litres of petrol. So, using CNG, the economic saving is quite big.
HOW DOES THE CNG PRICE CHANGE?
CNG purchase price is indexed to the oil price and it is expressed in dollars. Normally on the oil products market, daily changes of purchase price cause rapidly variations on liquid fuels final prices, which often increase or decrease more times in the same week.
For the CNG for cars, instead, update of supplying price is based on the average of the oil products prices, on a longer lapse of time; so, price changes are less heavy and more delayed in the time.
HOW MUCH IS ON AVERAGE A TRANSFORMATION FROM A PETROL SUPPLY TO A PETROL/CNG ONE (BI-FUEL)?
Many factors influence a CNG transformation cost, such as vehicle original supply (carburettor, injection, etc.), kind of equipment installed (traditional, phased injection, etc.), number of CNG cylinders, etc.
In order to give an idea, however, the average cost of a conversion, installing a new 90 litres cylinder, is about of:
€ 1.400,00 for vehicle with carburettor or injection EURO 0 or EURO 1;
€ 1.750,00 for vehicle with injection and carburetion control EURO 0 or EURO 1;
€ 2.300,00 for catalytic vehicle with gaseous injection system;
€ 2.400,00 for catalytic vehicle with sequential injection system.
These values are purely indicatives and they don’t consider extras for possible phase converter (roughly €100,00), for level indicator (€50,00), final test (€130,00).
For the right price of transformation, we suggest turning to a BRC installer.
ARE THERE ECONOMIC INCENTIVES FOR CONVERTING A PETROL VEHICLE TO GAS, OR FOR BUYING A BI-FUEL ONE?
In this moment economic incentives for converting vehicles are ended.
There are instead some LOCAL MEASURES and other incentives that favour users of LPG or CNG vehicles. For all the details concerning these measures, see www.ecogas.it
BRC GAS EQUIPMENT: M.T.M. - Via La Morra, 1 - 12062 - Cherasco (Cuneo) - ITALY - Tel. 0172 48.681 - Fax 0172 59.31.13 - firstname.lastname@example.org