Gas av。 Avfuel

Avfuel

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Some new Cessnas are approved to use 82UL, but most aircraft types currently do not have manufacturer's approval. AvGas is short for Aviation Gasoline. Avgas Avgas is used in small piston engine powered aircraft within the General Aviation community. However, to confuse things further, there are four principal ways to measure Octane rating, RON, MON, Lean Mixture and Rich Mixture ratings. This brings us on to the other recent advance in General Aviation engines; the development by several engine manufacturers of diesel engine technology. 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. Procedures and equipment for safe handling of this product must therefore be of the highest order. In today's General Aviation community there are only two main Avgas grades 100 and 100LL low lead - a rationalisation that has enabled fuel companies to continue supplying a market that would otherwise have become uneconomic. There are two major specifications for Avgas 100. This grade is listed in the same specifications as Avgas 100, namely ASTM D 910 and UK DEF STAN 91-90. Those highlighted in green are a "Super Deal" and have the lowest price within 150 miles. 100LL has a high lead content 0. So in summary, Aviation engines present many unique challenges to the development of Avgas and as such there is yet no firm date to replace Avgas 100LL, but there can be little doubt that eventually Leaded Avgas will be withdrawn from use. Shell is involved with all of the major prospective aviation diesel engine manufacturers and is working closely on these projects. In the past, there were many different grades of aviation gasoline in general use e. Avgas grades are defined primarily by their octane rating. There is a legal grey area that has some vendors willing to dispense AvGas into "approved" containers if they believe the end use of that AvGas is fueling an aircraft engine. These two specifications are essentially the same but differ over antioxidant content, oxidation stability requirements and max lead content. 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. These high levels of aromatics will also damage rubber components in automotive fuel systems such as fuel lines, fuel pump seals and injector washers. However this does not seem likely until suitable fully developed alternatives are available; a situation that is likely to be several years into the future. Most aircraft fuel dealers refuse to put AvGas into anything other than an aircraft fuel tank. Piston engines operate using the same basic principles as spark ignition engines of cars, but they have a much higher performance requirement. However, it is not yet available in Europe but also not everyone can use it - your aircraft manufacturer must raise a Aircraft Modification document to approve its use. Summary of Avgas grades Avgas 100 The standard high octane fuel for aviation piston engines. To ease identification the fuels are dyed i. Although the total fuel volume used in aviation is less than 0. LL100 is blended with a high percentage of aromatics causing reduced throttle response which is not an issue with an aircraft engine but certainly an issue in a high-performance automotive engine. To date there are no additives available to replace TEL which increase the Octane rating - the additives used in automotive Lead Replacement Fuels only tackle the problem of valve seat recession and do not effect the Octane rating of the fuel. There is still up to 0. This is an 82 Octane Lean Mixture rating fuel and is approved for use in modern non turbo Avco Lycomings engines amongst others. Currently the two major grades in use internationally are Avgas 100LL and Avgas 100. 5 grams per litre , even higher than leaded race fuels. History of AVGAS Grades Avgas is gasoline fuel for reciprocating piston engined aircraft. Avgas 100LL is dyed blue. As with all gasolines, avgas is very volatile and is extremely flammable at normal operating temperatures. Predominately activities such as private pilots, flight training, flying clubs and crop spraying. Lead deposits will also block oxygen lambda sensors and catalytic converters and foul spark plugs even after only a short use. AvGas LL100 stands for "Low Lead 100 Octane". The other more significant problem with unleaded fuels is that of Octane rating. Also, 100LL has a chemical package added to make it perform at high altitude, and that isn't the best thing for motor vehicle performance here on the ground. Avgas is measured on Lean Mixture similar to MON but also has a Rich Mixture Octane rating. The sale and use of AvGas is heavily-regulated. 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. All equipment and facilities handling avgas are colour coded and display prominently the API markings denoting the actual grade carried. The Bottom Line: Avgas may be suitable for some race cars that don't have catalytic convertors or oxygen sensors and are rebuilt often enough that the TEL lead build-up is not an issue. AvGas is blended for large-bore, long-stroke, low RPM engines which run at high altitude. AvGas is of interest to motoring enthusiasts because of its availability, octane rating and low price compared to commercial race fuels. 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. To understand what is involved, we first need to look at what benefits TEL has. 341. TEL Tetra-ethyl-lead is added to raise the octane. Two ratings are applied to aviation gasolines the lean mixture rating and the rich mixture rating which results in a multiple numbering system e. 1394 users online Great Deals in Aviation Fuel 100LL Avgas The 205 airports and FBOs listed below have the cheapest 100LL Avgas of any public airport within 50 miles, where prices have been reported in the last 10 days. Can I run AvGas in my vehicle? To read more about the fuel, download its now. While AvGas' higher octane is useful, smaller-bore, shorter-stroke, high RPM engines will perform better on racing fuel or high quality octane boosters. Once attached to the valve they form an abrasive surface which further damages the valve seat. Avgas 100LL is coloured blue, while Avgas 100 is coloured green. The Future of General Aviation Fuels Currently the two principal types of fuel used in Aviation are Avgas 100LL and Jet A-1; Jet A-1 for turbine engines and Avgas for spark ignition piston engines. This de-rating would be so severe that many of the engines would no longer be powerful enough for the aeroplane in question. AvGas might seem an obvious choice but closer study raises some doubt. Therefore if Avgas 100LL were to disappear, the only other option currently available to owners with turbo or supercharged engines would be for the aircraft manufacturer raise a modification to replace their engine with either a turboprop or diesel engine. It has a high lead content and is dyed green. Modern aviation unleaded fuels are currently being developed, such as 82UL in the United States. The downside will be the cost of engine replacement and aircraft modification and whilst some applications may be able to take advantage of this technology, this will not be a solution for everyone. In those cases, we suggest calling ahead to confirm prices. Worldwide, total Avgas volumes are low, since Avgas-fuelled aircraft, although they outnumber jet-fuelled aircraft, are generally much smaller. For other applications use an unleaded race fuel or a good quality octane booster. This is common in new manufacture Avco Lycoming and Teledyne Continental engines, but some older engines would need modification. Low lead is a relative term. However, for those aeroplanes with supercharged or turbocharged engines the use of low octane unleaded fuels would not be suitable. 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 deposits left when TEL lead is burned are corrosive and damaging to valves, valve guides, valve seats and cylinder heads. The Lean Mixture rating is 100 octane 15 octane higher than the comparable 85 MON for unleaded Mogas but Avgas also has a Rich Mixture rating of 130 which allows higher supercharger boost pressures to be used without detonation occurring. Avgas 100LL This grade is the low lead version of Avgas 100. Some years ago, an additional grade was introduced to allow one fuel to be used in engines originally designed for grades with lower lead contents: this grade is called Avgas 100LL, the LL standing for 'low lead'. These engines potentially offer several significant advantages over Avgas engines. Because AvGas has no taxes and duties on it, use on public roads is illegal and if found could result in your vehicle being impounded. To avoid confusion and to minimise errors in handling aviation gasoline, it is common practice to designate the grade by just the lean mixture performance, i. As you may be aware, Avgas contains Tetra Ethyl Lead TEL - the additive which has recently been banned in automotive forecourt fuels in the European Union for environmental reasons. They are also the cheapest of their 10 nearest competitors providing 100LL Avgas in their area. AvGas has a lower specific gravity so it will require a change in air-fuel ratio calibration for the engine to perform at its best. The ASTM D 910 and UK DEF STAN 91-90. If you are a general aviation pilot, the one you are probably more familiar with is Avgas and it is this which we will concentrate on here. We connect aviation customers of all types — FBOs, airports, corporate flight departments, charter operators, helicopters, regional and major airlines, the military, and more — with comprehensive systems or a la carte solutions tailored to the specific activity at hand. 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. Road fuels tend to be measured on a RON scale, for which unleaded fuels tend to be 95 - 98 RON but are only 85 - 87 MON. Unless otherwise indicated, prices are not guaranteed. This loop-hole is how some may obtain AvGas for automotive use. As you may know from the problems with Automotive fuels, Lead compounds from TEL form a protective layer on the valve seat and prevents the soft valve seats from eroding. Avfuel Corporation is a global supplier of aviation fuels, systems, and services. Without TEL small areas of a soft metal valve seat will fuse to the valve and be 'plucked' from the face of the seat. This is particularly a problem when using high power settings at low altitude, for example during take off. This combination of actions is known as Valve Seat Recession VSR as the seat of the valve is worn away and recesses into the cylinder head. When used in a motor vehicle this fuel will leave a lot of lead deposits in the motor. The solutions to this are to either use a VSR additive or fit hardened valve seats which are resistant to this action.。 。 。 。 。

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