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A Guide to Aircraft Gasoline.

Of the many fuels that we have, the type to be used on an aircraft depends on the aircraft in question. While Jets use diesel fuels, other aircrafts have engines that run on Mogas or AV gas. In this article, we will look at AV gas properties and benefits.

Aviation gasoline or AV gas is a type of fuel that most piston-powered aircrafts use. It is a kind of aircraft fuel that is very common and has a history of usage. Aviation gasoline is essential in enhancing the functionality of piston engines. There are a number of additives that can be found in AV gas such as corrosion inhibitors, icing inhibitors, static dissipaters, color dies, metal deactivators, tetraethyl, antiknock, and oxidation inhibitors.

At standard temperatures, AV gas, is highly volatile and very flammable. As a result, it should always be handled with extreme care for safety. The two main types of ratings for AV gas are lean and rich mixture ratings which are the octane ratings that define the various grades of AV gas.

Gasoline fuels are mostly formed from hydrocarbons with the most popular being Iso-octane. Iso-octane hydrocarbons have superior antiknock properties. Those fuels whose antiknock properties resemble those belonging to iso-octane are awarded a rating of 100. Heptane is another example of hydrocarbons which can also be applied to fuel octane rating once it is mixed with varying amounts of iso-octyne.

Nowadays, adding lead or any other replacements gives more power to the engine before detonation. This means that the addition of lead will improve the performance of the engine. Another factor that helps to increase the power of an engine is the air ratio of the fuel.
Contrary to what is believed by many, converting to the use of fuel with high octane ratings alone without changing anything else is not the only requirement of improving an engine’s power. High octane ratings of fuel are mostly applicable in high compression engines for the reason that it is useful in interrupting the possible occurrence of knocking or detonation at settings of high power.

Another classification of AV gas is the 100LL, which has at least a 0.5 gr lead per liter of fuel and is considered a low lead fuel version. In addition, we have the AV gas 82UL that is a type of unleaded AV gas applicable in engines that have low compression ratios.

In earlier years, AV gas had many different grades all of which have been narrowed down to one single type called the AV 100.

While adding lead to aviation fuel might be good in enhancing the performance of an engine during combustion, unleaded fuels are recommended for reasons relating to health. However, lead pollution is mostly caused by the millions of cars that use lead fuel.

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