A vehicle can run because of the process in the combustion chamber. One of the conditions for combustion to occur is the presence of fuel. Petrol circulating and marketed in Indonesia is produced by a state-owned company, namely Pertamina.
The circulating gasoline consists of 3 types which we are familiar with premium, pertalite, and pertamax.
In addition to the different prices, the three types of fuel have their own characteristics. The following are the characteristics of premium gasoline, pertalite and pertamax.
Octane content or commonly known as RON (Research Octane Number) is a measurement of the quality of a gasoline fuel. The octane rating is a number that indicates how much pressure can be applied before the gasoline ignites spontaneously. The air and gasoline mixture is pressed by the piston and then ignited by the sparks generated by the spark plug.
Due to the high pressure, the air and gasoline mixture can also ignite spontaneously before getting sparked by the spark plug, it could create knocking in the engine. This knocking could cause the engine to break down quickly, thus it should be avoided as much as possible. So, the higher the octane rating, the less knocking will occur. Premium gasoline has an octane rating of 88, pertalite is 90 and Pertamax is 92.
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Premium types of fuel can be used in vehicles with a low compression ratio, which is below 9:1, pertalite with a compression ratio of 9:1 to 10:1, while pertamax with a compression ratio of 10:1 to 11:1. So what is compression ratio? The compression ratio is the ratio of the volume of the combustion chamber from the largest capacity to the smallest capacity.
So it means that when the piston is at bottom dead center and the volume of the combustion chamber when the piston is at top dead center. As we know that the higher the compression value, the greater the potential for the engine to experience knocking, so it is advisable to use high octane fuel. Although vehicle manufacturers have standards and recommendations regarding what type of gasoline should be used in their vehicles. Vehicle owners have certain reasons in choosing the type of gasoline to be used such as cheaper price alternatives, but there are also those who choose gasoline with good quality because it affects the performance of the vehicle they have.