Bifuel or not? This is the question…Part 2


GAS © by doublecompile

Here follows the analysis of LPG-CNG  started in the past weeks with questions and answers:
Life of LPG-CNG injectors around 30000 miles

As mentioned is always advisable to switch to LPG with gasoline especially if you make long-distance routes, for short routes this problem does not exist.

Replace LPG-CNG filter every 10000miles

The cost is very limited (less than simple operation, and 25 euros)

Engine performance and reduced performance gasoline than before the installation, consumption more than gasoline

It is true, from 10 to 20%, but today (in Italy) the gasoline-to-LPG spread  is about 90%.
As with the petrol is very important the perfect stoichiometric control of air / gas mixture for low emissions, high performance, low power consumption and to avoid further increases in temperature in the combustion chamber and in the drain circuit.
Under lean mixture conditions (excess air) temperatures rise significantly.
Under rich mixture conditions (excess gas) parts not burned in the combustion chamber burn in the catalyst. Even in this case the temperature rises dramatically and in both cases you will have premature wear of valves, valve seats and the catalyst.

Parking is not always allowed in the garages underground

For the LPG-powered cars, parking is allowed in the ground and first floors above the basement garage, even if organized on a more underground floors (as per ECE / ONU 67-01).

Frequent calibrations and controls for the various engine fault shutdown lights

This is comprehensible as for the cars with different power. All cars that comply with Euro 3 standards, and Euro4 Euro5 have a control system on system failure “EOBD”. This symbol indicates an on-board diagnostic system for emission control.
The system failure is indicated by a flashing amber light:
The signal of the anomaly occurs in two ways:
1) led on steady light: the motor control signals the presence of an error that leads to the deterioration of the catalyst.
In this case you can continue to run with your vehicle, but it should be checked as soon as the cause of the anomaly.
2) to flashing light on: the motor control signals the presence of “misfire, or misfire” that lead to damage to the catalyst.
In this case it is not recommended for LPG operation.

Replacement of LPG cylinder after 10 yearsFor the CNG cylinders must be reviewed every 5 years if they are approved according to national legislation, if every 4 European standard (ECE R110 / UN) and replaced, respectively, after 40 or 20 years

It’slegislation that requires him to (correctly), however it comes to longer than the lifetime of a car

The savings is relative because if you do short journeys will be a long way to go, as water temperature must reach at least
25 ° (ie winter….) to commute gas.

It is not a big drawback, it is’ advisable to alternate the use both of two fuels especially at high speeds and in conditions of maximum effort engine (eg on the highway on long routes is very important to alternate gas fuel just to avoid wear on valves, valve seats and catalyst).
In urban route instead you can use only gas as driving conditions do not involve an increase in temperature in the combustion chamber such as to cause premature wear.

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