what is av-gas
Thread Starter
Le Mans Master
Joined: Aug 2001
Posts: 7,064
Likes: 18
From: Arizona
what is av-gas
I am speaking to a few of my racing buddies and they insist on putting AV-gas (aviation fuel) in their cars since it has higher octane and is supposed to burn 'cleaner'. I was told by my plane buddies though that regardless of the higher octane, that av-gas is designed to burn at higher elevations and is not good for normal compression cars.
Can someone please explain this to me.
Can someone please explain this to me.
Le Mans Master
Joined: Jan 2001
Posts: 5,786
Likes: 6
From: Lafayette Colorado
Re: what is av-gas (ICULUKN-C5)
Av fuel is just higher octane unleaded gas. I believe that it has a rating 130. The only reason not to use it is that unless you are running 15:1 or higher compression, the extra octane is wasted. At about $12 a gallon, you do not want ot be wasteful :ekk:
Keith
Keith
Le Mans Master
Joined: Mar 1999
Posts: 6,744
Likes: 1
From: delmont pa
Cruise-In I Veteran
Cruise-In II Veteran
Re: what is av-gas (ICULUKN-C5)
100 low lead av gas is 106 octane if rated the way car gas is rated. it works fine and it is $2/3 a gallon cheaper than race gas but airports will not install it into your car because there is no road tax on av gas. your best bet is 100 octane unleaded race gas sold at so gas stations. for years we dyno tested with av gas because it is goverment controlled so every gallon you buy is exactly the same and that is somthing that cannot be said for race gas because some race gas dealer have been know to cut the fuel,so be careful who you buy race gas from. :chevy
[Modified by clem zahrobsky, 1:27 PM 12/31/2002]
[Modified by clem zahrobsky, 1:27 PM 12/31/2002]
Burning Brakes
Joined: Dec 2001
Posts: 886
Likes: 273
From: Greenwell Springs La.
Re: what is av-gas (ICULUKN-C5)
I had a sample of av-gas tested when I worked at Exxon and it had about 2 grams of lead per gal. It is slightly over 100 octane as stated above. There is a business here in Baton Rouge that buys it in bulk and sells it to the local drag racers. I used it in my 13 to 1 compressioned 498 in. big block with no problems. If you use it in your Vette it may mess up your cats. Jimmy
Pro
Joined: Oct 2002
Posts: 590
Likes: 0
From: Saratoga CA
Re: what is av-gas (ICULUKN-C5)
The most common av-gas is referred to as "100 low lead", 100 octane low lead and it is blue in color (lower lead level than 80 octane av-gas which is red in color) but still a LOT more lead than the old leaded auto gas (pre-1975?). It doesn'r contain the detergents and other additives found in auto gas and I istated above, it had a lot of lead in it that will destoy your catalytic converter.
:seeya
:seeya
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Melting Slicks
Joined: Jul 2000
Posts: 2,651
Likes: 6
From: redlands,ca.-usa
Re: what is av-gas (billreid1@***.net)
AND the only place to get 130 octane AVI fuel is the Reno Air Races held in Sept. of every year. Fuel is blended just for the racers--fantastic aroma on a cold engine start up.
Racer
Joined: Jan 2001
Posts: 457
Likes: 0
From: Stockbridge GA
Re: what is av-gas (Face)
Small engine av-gas is laced with stabilizers to slow the degredation normal to fossil fuels over time. The stabilizers are required in small engine av-gas due to the amount of time the fuel remains in the wing tanks waiting to be used. It's not uncommon for this fuel to be in wing tanks for several months or more. These additives are probably not good for the emission control systems and sensors found in our cars.
Run the good Amoco.
Run the good Amoco.
Drifting
Joined: Dec 2000
Posts: 1,255
Likes: 50
From: Clayton, NC north carolina
Re: what is av-gas (Bugster57)
A&P Mechanic here, Unless you have removed the cats you dont want to run 100LL. O2 sensors dont last long eather because they get coated with lead deposits. If you run it in a car you have to mix it with regular 91 octain because the fuel is engineerd diffrently. If you do a search for av-gas there was a great artical from one of the speed demon guys (I think) An avrage Lycoming (cesna,Mooney,Beech...ect. Use thes engines and fuel) makes all of its power below 3,000RPM so the fuel is engineered for low RPM and high cylinder pressures. The fuel also has to overcome extreem tempratures and pressure diffrentials at altitude.
[Modified by ASRoff, 10:47 PM 1/3/2003]
[Modified by ASRoff, 10:47 PM 1/3/2003]
