- All petrol-powered cars, carburettor, injection and injection with catalytic converters can be converted to gas.
The methane systems are currently available also for direct injection vehicles.
- Yes the system can be installed on all diesel engines, including generators. As for vehicles, the
DDF system can be fitted on cars, vans, pick-ups, buses, trucks and tractors.
The DDF mix/blend (Diesel with CNG) will vary depending on the type/configuration of the engine, its capacity and the engine's
condition/age. Typically, though, 30-40% of diesel is substituted by CNG. This substitution, with a more efficient engine, results
in substantial cost savings to the user. The DDF, when it burns in the chamber, not only lessens NOX, CO and CO2, it drastically
reduces the carbon particulates (unburnt diesel smoke with suspended carbon particles) in the exhaust emissions thereby making it
an ideal, eco-friendly choice for diesel-fuelled engines.
Additionally, the DDF increases engine torque and power, prolongs engine life and leads to smoother running of the engine, reduced
crankcase deposits and lesser oil changes.
- First, we can say that the energy obtained from methane is less expensive, while the energy from gasoline
is more expensive. As regards the performance of the various types of fuel these are the results:
· The motors to "Eight cycles" (spark-ignition) have a yield of about 20% lower (also for the presence of the "butterfly" valve, which
gives rise to significant losses of liquid leakage).
· Among natural gas, LPG and petrol, used in spark ignition engines, methane has a few points of return in more thanks to higher antiknock
CNG has an octane rating of 130 and has a slight efficiency advantage over gasoline.
· Natural gas is cheaper.
· CNG is the cleanest burning fuel operating today. This means less vehicle maintenance and longer engine life.
· CNG vehicles produce the fewest emissions of any motor fuel.
· CNG have little or no emissions during fueling. In gasoline vehicles, fueling emissions account for at least 50% of a vehicle's
total hydrocarbon emissions.
· CNG produces significantly less pollutants than gasoline.
· Exaustemissions from gasoline operated cars release carbon dioxide, which contributes to global warming.
This is greatly reduced with natural gas.
- Methane is definitely more eco-friendly fuel among those commonly in use. A clean fuel but above all a ready
and reliable, that is, unlike gasoline and diesel is not attained through complicated and expensive refining processes, which
will inevitably be passed on to the sales price to the public, but from the beginning is ready to be used as an ecological fuel.
In methane are almost totally absent impurities, such as sulfur compounds, and are absent poisonous compounds such as lead and
polycyclic aromatic hydrocarbons and its combustion does not cause significant formation of odor or particulate matter.
With appropriate technology and calibrations, the motors get very low emission levels.
Detectable exhaust hydrocarbons are composed almost entirely of methane, non-toxic and already excluded in the calculation of
emissions from existing U.S. law and EU legislation on heavy vehicles.
The favorable ratio hydrogen / carbon of methane results in a production of CO2 considerably lower compared to other fuels.
In particular, the reduction is about 20% in comparison with gasoline.
- To ensure the proper functioning over time the system is subject to periodic checks (eg filter change)
according to a maintenance schedule every 15-20000 Km. Such interventions are therefore generally carried out by the workshop
in conjunction with the car's regular coupons with an emphasis on power and the electrical system.
- 1 cubic meter of methane corresponds to 0.671 Kg while 1 kg of methane
corresponds to 1.49 cubic meters of methane (at 15 ° C and 1 bar pressure).
- A power supply of natural gas involves the following changes: a loss of maximum power of only 10% of the
maximum torque which translates into a decrease of the maximum speed of only 5% -10%.
The savings on the cost of fuel is due, on the one hand, the energy efficiency of different fuels and, second, the fiscal
policy of the government.
As regards the energy yield 1 kilogram of methane corresponds to approximately:
· 1.675 Liters of petrol
· 1.300 Liters of diesel
· 2.000 Liters of LPG
- To calculate the range of a CNG powered car, you should know that 1 kg of methane is approximately 1.7 L of gasoline
and that the coefficient of distance CNG / Gasoline is 0.3 (with a 70 liters CNG tank it's possible to run a distance comparable to
the one made with about 21 liters of petrol).
- Natural Gas for Vehicles is a fuel for internal combustion engines that is basicallycomposed of Methane gas
and its use offers extraordinary advantages.NGV, unlike petrol, does not contain lead because of its high octane rating (120-130).
As combustion is more complete, the contaminating effects of the exhaust gas emissions arereduced by approximately 80%. These gases
are also less corrosive, thus increasing the duration of the exhaust system. NGV keeps the spark plugs clean, prolonging their use;
itdoes not contaminate the oil, doubling the time required for oil changes and that of thefilters; it improves lubrication because
the cylinders are not washed by petrol excess, thusavoiding premature wear in the motor.
- The use of methane offers extensive security guarantees, in many ways higher than conventional fuels.
Methane has a lower density than air so if it escapes into the environment, tends to disperse upwards without forming dangerous
concentrations or accumulations to the ground.
To test security of the systems methane, have been performed tens of fire and crash-test, to verify, with the most sophisticated
equipment, the efficiency and the degree of security of systems and tanks.
The methane has a higher flash point compared to all other types of fuels. Its auto-ignition temperature is double (650 ° C)
compared to liquid fuels and the fuel concentration in the air because it may have a combustion (5%) and much greater than the
petrol (1%) and diesel (0.5% ) These are factors that contribute to significantly lower the risk of an accident with the
development of fire.
Methane is also not dangerous to your health even in high concentrations, as non-poisonous.
- Tanks of natural gas vehicles are much more solid than tanks of liquid fuels (gasoline, diesel or LPG)
and far outweigh the impact and flammability standards required by the more severe international standards
In case of a accident fire is caused in vehicles with dual petrol / methane system, from the gash of the petrol tank and
not by the rupture of the cylinder of methane, which is the most resistant component in the car.
Each methane cylinder is tested at a pressure of 300 bar, and that is 1.5 times the normal operating pressure (200 bar).
They are also tested in hydraulic destructive pressure; the minimum strength required is 2.25 times the operating pressure (450 bar),
in practice it reaches values of rupture pressure of 580 bar. Finally, for the dynamic cylinder bursting, to strict international
standards impose a defined behavior "leak before burst" that is, a progressive leakage of gas by cracking of the cylindrical body,
before it arrives at the failure of the structure.
The safety valves fuse in case of fire and increase in temperature and pressure, allow the controlled discharge of gases avoiding
In the case in which the pipe on board should break, the safety valve against excess flow (positioned on the cylinder valve)
prevents the uncontrolled release of gas.
All these tests of thermal and mechanical resistance mean that the cylinders methane components were found to be far more
resistant to board the vehicle, including the structural parts.