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Lycoming to approve 93 octane auto gas for O-360 & IO-360
On Jun 9, 3:16*pm, David Lesher wrote:
"JGalban via AviationKB.com" u32749@uwe writes: * If you're O-360 happens to be in a Cherokee, you can already get an auto gas STC. *Otherwise, I wouldn't hold my breath on this Lycoming move. *The autogas spec they're trying to get approved can contain oxygenates (mainly ethanol, now that MTBE is gone). * There is no real reason that FBO's can not get un-tainted gasoline. The alcohols are added in when the truck is filled. The difficulties are procedural not strategic... In some states the alcholol is required by law in auto fuel. Not sure if the refinerys are going to be interested in making a special aviation batch when they already make 100LL. -Robert |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
"Robert M. Gary" writes:
There is no real reason that FBO's can not get un-tainted gasoline. The alcohols are added in when the truck is filled. The difficulties are procedural not strategic... In some states the alcholol is required by law in auto fuel. Not sure if the refinerys are going to be interested in making a special aviation batch when they already make 100LL. As I said, it's added at the truck-loading station. Not at the refinery. So if it's NOT being sold for cars.... -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
On Jun 7, 10:47*pm, wrote:
Due to the problems of getting 100LL *in many places, Lycoming is seeking FAA approval for the standard compression engines to be able to use 93 octane auto gas. Link to avweb article bellow. Sounds like good news, since I have an O-360. Maybe airports will start to carry it. http://www.avweb.com/avwebflash/news...AutoGasApprova... Yep, and all you have to do is to fly to Europe to get ASTM D4814 gas. I guess its not too far out of my way to get cheap gas -Robert |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
"Robert M. Gary" wrote in message ... On Jun 7, 10:47 pm, wrote: Due to the problems of getting 100LL in many places, Lycoming is seeking FAA approval for the standard compression engines to be able to use 93 octane auto gas. Link to avweb article bellow. Sounds like good news, since I have an O-360. Maybe airports will start to carry it. http://www.avweb.com/avwebflash/news...AutoGasApprova... Yep, and all you have to do is to fly to Europe to get ASTM D4814 gas. I guess its not too far out of my way to get cheap gas -Robert We could just import it! |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
On Jun 11, 7:21*pm, "Blueskies" wrote:
"Robert M. Gary" wrote in ... On Jun 7, 10:47 pm, wrote: Due to the problems of getting 100LL in many places, Lycoming is seeking FAA approval for the standard compression engines to be able to use 93 octane auto gas. Link to avweb article bellow. Sounds like good news, since I have an O-360. Maybe airports will start to carry it. http://www.avweb.com/avwebflash/news...AutoGasApprova... Yep, and all you have to do is to fly to Europe to get ASTM D4814 gas. I guess its not too far out of my way to get cheap gas -Robert We could just import it! according to the article ASTM D4814 is the American standard, no? All it really means is that 93 octane (88 aviation rating) auto gas that doesn't have ethanol or something else in it is OK. Why else would Lycoming be going to the trouble if it wasn't available here. If ASTM D4814 isn't available now, it is almost certainly easier and cheaper than avgas, which is far different than auto gas. Bud |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
JGalban via AviationKB.com wrote:
I'm curious where you got the 88 aviation octane number. If that is accurate, O-360s and IO-360s will likely be blowing holes in the tops of their pistons on hot days. John Galban=====N4BQ (PA28-180) Temp has almost nothing practical to do with the octane required. What matters is the internal cylinder pressure. For example the IO-520 in my Bo develops about 800 psi, sea level and standard day, at max rpm and full throttle. The GAMI guys have instrumented aviation engines and gathered this data. Neither Lyc or Continental have done so. At 800 psi the 520 is on the ragged edge of detonation. That's at 31 inches of MP, what you'd get at sea level. They also determined that at 26 inches of MP the 520 develops 400 psi. This is also why owners with constant speed props are told to always reduce manifold pressure first. If you are at 800 psi with everything wide open and you reduce rpm you have made the situation worse. The engine stays at the high pressures longer, and at a different spot relative to top dead center, because you just made the engine turn slower. All bad. So the fact is that it is the internal cylinder pressure that determines what octane you need. While reading the article he wrote I got to thinking that I never see over 26 inches of MP at my elevation of 3650 and of course the higher you go the lower it gets. Therefore here at 3650 MSL 100 octane is not needed, 90 would be more than adequate. And go to those mountain strips that are higher yet and your octane requirement drops even lower. |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
On Jun 12, 12:13*pm, "JGalban via AviationKB.com" u32749@uwe wrote:
wrote: All it really means is that 93 octane (88 aviation rating) auto gas that doesn't have ethanol or something else in it is OK. * *Doesn't have ethanol? *I don't think so. *I read the spec and it has provisions for oxygenates (ethanol by default). *Lyc. doesn't care if you burn ethanol in the engine. *It's the plane's fuel system (tanks, hoses, seals, etc...) that are most likely to have problems with it. *Lyc. is not applying for airframe approvals, so that's not their problem. * *I'm curious where you got the 88 aviation octane number. * If that is accurate, O-360s and IO-360s will likely be blowing holes in the tops of their pistons on hot days. John Galban=====N4BQ (PA28-180) -- Message posted viahttp://www.aviationkb.com I got the octane info from a member of the Cardinal flyers group that owns a turbo Cardinal. He works for Chevron and is very knowledgeable about petroleum products. He has a digest column where he answers questions from members about their planes. Regards, Bud |
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Lycoming to approve 93 octane auto gas for O-360 & IO-360
"Robert M. Gary" wrote in message ... On Jun 7, 10:47 pm, wrote: Due to the problems of getting 100LL in many places, Lycoming is seeking FAA approval for the standard compression engines to be able to use 93 octane auto gas. Link to avweb article bellow. Sounds like good news, since I have an O-360. Maybe airports will start to carry it. http://www.avweb.com/avwebflash/news...AutoGasApprova... Yep, and all you have to do is to fly to Europe to get ASTM D4814 gas. I guess its not too far out of my way to get cheap gas -Robert In the E.U. i seen gas $3.70+ USD a liter auto gas is $1.20 at the same airport. Geeenland is still $22.00+ a gallon we ahve it good here..... |
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