Today there are many alternative fuels to run our vehicles that were running only on conventional fuels like diesel or petrol. One of the alternatives is liquefied petroleum gas (LPG). It’s the same fuel that is used in our kitchens to cook food. The use of LPG in the automobile sector is increasing because of many reasons. However, there are numerous benefits of using LPG as fuel in SI Engines, but at the same time, there are bad consequences too.

Also Read: Why Diesel Engines Are Heavier Than Petrol Engines ?

In this article, you will get to know the advantages and the disadvantages of using LPG in the SI engine.


Advantages Of Using LPG:

1. By shifting to LPG as an automobile fuel, there can be a considerate decrease in the environmental pollution as the carbon-dioxide which our vehicles release is reduced.

2. LPG in the SI engine makes less noise as compared to the diesel engine. Secondly, as LPG evaporates quickly, in case of spillage fewer particulates are produced.

3. It reduces the dependency on petrol and diesel for driving automobiles.

4. It is cheaper than petrol and diesel. Also, it gives more mileage which can save up to 40 % of the fuel costs compared to petrol and 20% compared to diesel.

Also Read: Why Diesel Engines Are Heavier Than Petrol Engines ?

5. Due to a higher octane rating of LPG, the combustion is smoother and knocking is eliminated.

6. In the event when LPG leaks past the piston rings into the crankcase, it does not wash away oil from the walls of the cylinder which doesn’t produce black carbon. Therefore, there is no washing off of the lubrication layer, increasing the engine life by up to 50%.

7. The life of electrode is increased because during LPG as a fuel there is no deposition of carbon on the electrodes.


1. LPG has a high heat of vaporization; therefore, the volumetric efficiency is reduced.

2. It is handled under a pressure of about 18 bars.

3. Complete combustion of fuel takes place, therefore more heat is produced and it is not good for the engine over a long run.

4. As its odor is faint, it cannot be easily detected in case of any leakage.

5. The manufacturer warranty of the engine can be affected by LPG usage.

6. To get it installed in your vehicle, you will need a trained LPG conversion specialist.

Also Read: Why Diesel Engines Are Heavier Than Petrol Engines ?

Apart from these disadvantages, there are some other points that can be considered as disadvantages when it comes to using LPG as a fuel in your car and these must be taken care of  before using LPG in the engine. The installation of LPG kit is not easy and it comes at a handsome price which can poke a hole in your pocket. However, in the long run, using LPG comes out to be cheaper as compared to other fuels like petrol and diesel.

1 comment

Leave a Reply

Your email address will not be published. Required fields are marked *