How many octane is avgas

Discharge your static electricity before fueling. Fill portable containers on the ground. Harmful or fatal if swallowed. Avoid breathing the vapors and skin contact. Do not wash down spills with water. The solutions to this are to either use a VSR additive or fit hardened valve seats which are resistant to this action.

VSR additives are now commonly used in Lead Replacement Petrol on automotive forecourts, however for several reasons they are not yet approved for use in aviation engines. This means that the only current method of preventing Valve Seat Recession for aviation engines using unleaded fuels would be to fit hardened valve seats.

This is common in new manufacture Avco Lycoming and Teledyne Continental engines, but some older engines would need modification. To make this clear, octane rating is not a measure of the amount energy in the fuel, but is a measure of its resistance to detonation. The advantage or higher octane fuels is that a higher compression ratio or supercharging ratio can be used, which then leads to a higher engine cycle efficiency, which in turn means more power output for a given fuel burn. The Lean Mixture rating is octane 15 octane higher than the comparable 85 MON for unleaded Mogas but Avgas also has a Rich Mixture rating of which allows higher supercharger boost pressures to be used without detonation occurring.

This is particularly a problem when using high power settings at low altitude, for example during take off. This is not a problem for most typical modern normally aspirated engines as their compression ratios are quite modest and detonation would not be a problem with 80 - 85 Lean Mixture Octane fuel.

However, for those aeroplanes with supercharged or turbocharged engines the use of low octane unleaded fuels would not be suitable. The only way to operate these turbo engines on current unleaded technology fuels would be to significantly reduce the boost pressure of the supercharging and massively de-rate the engines. Aviation gas still contains tetra-ethyl lead additives to lubricate the engine. Lead was taken out of automotive gas in Using leaded avgas in a modern car would ruin components such as the catalytic converter.

It would be like putting diesel fuel in your gas-powered car? However, Jet-A could be used in diesel-engine vehicles, but it lacks some of the lubricants found in road diesel fuel. The most common avgas is octane, which is a measure of the fuel's ability to resist premature detonation or "knock.

At the pump, you'll find gas ranging from 87 to 93 octane for automotive use. It is generally safe to operate engines with a higher octane fuel than required, but not lower. Some people have tried to use octane avgas in race cars to stop premature detonation in turbocharged engines, but it requires engine modifications to perform well.