Anyone use Avgas 100 LL in place of racing fuel?
#2791085
06/30/20 05:27 PM
06/30/20 05:27 PM
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Joined: Feb 2005
Posts: 2,158 God's Country - Etowah, TN.
A34
OP
top fuel
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OP
top fuel
Joined: Feb 2005
Posts: 2,158
God's Country - Etowah, TN.
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Hey Guys,
Has anyone ever used Avgas 100 LL in place of racing fuel? How did it work for you? Any potential dangers in using it?
Thanks!
God Bless America, Our Troops and Their Families !
DEO VINDICE
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: A34]
#2791096
06/30/20 06:01 PM
06/30/20 06:01 PM
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Joined: Jan 2003
Posts: 31,041 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,041
Oregon
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Hey Guys,
Has anyone ever used Avgas 100 LL in place of racing fuel? How did it work for you? Any potential dangers in using it?
Thanks! Probably at least 10,000 people.
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: AndyF]
#2791111
06/30/20 06:37 PM
06/30/20 06:37 PM
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Joined: Jun 2003
Posts: 2,411 Weatherford, Texas
RapidusMaximus
top fuel
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top fuel
Joined: Jun 2003
Posts: 2,411
Weatherford, Texas
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I've been using it in my street driven 10.5 compression 68 GTX since I finished the restoration in 2015 and I use it in my 11.0 compression 360 Magnum 67 Dart bracket car, never had an issue, helps that I live next to a small airport.
Last edited by RapidusMaximus; 06/30/20 06:41 PM.
1968 Plymouth GTX 1974 Dodge P/U Long Bed Stepside 318 2019 Ram 2500 6.4, auto, 4WD
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: A34]
#2791134
06/30/20 06:58 PM
06/30/20 06:58 PM
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Joined: Aug 2003
Posts: 43,193 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,193
Bend,OR USA
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I stop using Av Gas, not 100LL, in my race cars back in the mid 1970s after seeing the pitting the valve seats and valves it caused in high RPM motors, above 4000 RPM I have used some 100 LL in some other Hi Po street cars since then due to it having shelf life of 18 months, it has a noticeable distinct smell that some law enforcement officers can notice, it has a $10,000.00 Federal fine on using it on the street due to the lead content, if they want to write you up for that I owned and flew a small airplane for a little over 15 yrs, spent around 900 hours in flying it with using 100 LL only fuel in it. Before leaded additives where outlaw for street gasoline there was three different blends of Aviation gasoline in the 1970s, 85/100, 100/115 and 115/145 which later became 115/130 octane. I use the 100/115 in my race cars back then
Last edited by Cab_Burge; 06/30/20 06:59 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: AndyF]
#2791233
06/30/20 09:24 PM
06/30/20 09:24 PM
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Joined: Jan 2003
Posts: 31,041 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,041
Oregon
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: AndyF]
#2791242
06/30/20 09:34 PM
06/30/20 09:34 PM
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Joined: Jan 2003
Posts: 6,142 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
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I've not used it in years, and over here, it's just easier to buy some of the more basic race fuels. I don't really recall there being any real difference in power, compared to the 100 octane race fuel I used instead of the AVgas. I recall the AVgas likeing more ignition timing.
Alan Jones
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: DusterKid]
#2791380
07/01/20 09:09 AM
07/01/20 09:09 AM
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Joined: Aug 2008
Posts: 941 Texas, USA
ChrgrCuda
super stock
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super stock
Joined: Aug 2008
Posts: 941
Texas, USA
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I started having Sunoco 100 unleaded delivered in the 54 gallon drum. I switched my cars over to F.I., so I can't use leaded anymore. Seems the Sunoco 100 works well in my 10.8:1 440 stroker, 87 Buick GN and my 11:1 stroker small block.
68 Cuda Notchback [Email]10.86@120[/Email]
69 Charger R/T 440/505
2009 Challenger SRT8
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: 340Cuda]
#2791508
07/01/20 01:34 PM
07/01/20 01:34 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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well be prepared to clean your plugs and dont idle too long. Tops of pistons will get lead deposits but it runs good. 100 Low lead is not really low lead. I would blend it with 91...and I clean a lot of spark plugs at work because we have 50 airplanes and about half run low lead...Tim
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: 340Cuda]
#2791747
07/02/20 12:15 AM
07/02/20 12:15 AM
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Joined: Aug 2003
Posts: 43,193 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,193
Bend,OR USA
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I I have heard folks say that the Avgas is blended for high altitude use and that makes it less than optimum for race cars. I had a friend that was an engineer that said Avgas burned too "dry". I don't really know what he meant. two things about todays 100 LL, it is a lot thinner, less specific gravity, than todays pump gas or todays race gas. Maybe he was referring to this As far as altitude and the design of Av Gas back in the day when commercial pressurized airliners ran Av gas they did tend to fly a little higher on the altitude than your normal non turbo charged or super charge piston engine airplanes fly normally for several reasons. Most piston driven non pressurized airplanes used today fly at or under 12,500 ft. above sea level for several reasons, one of them being the pilot is required to use oxygen above 12,500 if they are above that altitude for more than 20 minutes. I flew a friend and his grown 30 yr old Son to Denver and back from SO CA around 20 yrs ago, I had a five place oxygen system in the airplane with new canula for breathing at or above 12,500 ft. I had to go above 12,500 ft. going and coming back and they didn't want to use them, they both went to sleep and where groggy with a head ache on the return trip. I decided to fly direct from Denver to the Grand Canyon airport on the return trip to save time and fuel as we where able to depart the small airport in south Denver before 9:30 AM. I flew at 16,500 Ft for around 1 hour before descending down to 8,500 near Gallup N.M. so they wouldn't get oxygen starvation and suffer for the rest of the day. That didn't work as the damage had already been done I had to lean the mixture out mechanically from the cockpit with the leaning mixture knob anytime I flew 3,000 above sea level to avoid fouling the spark plugs I accidently foul one spark plug on my second flight after buying he airplane, only once That is not a good feeling when you loose the use of one cylinder on a six cylinder engine and your 3000 + Ft above the ground
Last edited by Cab_Burge; 07/02/20 12:16 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: 340Cuda]
#2791958
07/02/20 04:23 PM
07/02/20 04:23 PM
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Joined: Mar 2010
Posts: 632 MD-USA
Dodgeguy101
mopar
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mopar
Joined: Mar 2010
Posts: 632
MD-USA
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I cannot give you the details or the science behind it but I have heard folks say that the Avgas is blended for high altitude use and that makes it less than optimum for race cars.
I had a friend that was an engineer that said Avgas burned too "dry". I don't really know what he meant. I always like hearing this, its for high altitude. Pretty sure all airplanes take off from the ground and also pretty sure taking off takes more power than actually flying. I use it, and love it. 12 to 1. The car doesnt get driven much, so when the fuel evaporates, it doesnt leave any "goo" in the carbs. You have to jet up a little, not much, but some to make it run right. Carry on. It was 4.50 a gallon at the airport near me. LOL
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: Dodgeguy101]
#2792045
07/02/20 09:17 PM
07/02/20 09:17 PM
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Joined: Nov 2010
Posts: 3,696 jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,696
jersey
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I cannot give you the details or the science behind it but I have heard folks say that the Avgas is blended for high altitude use and that makes it less than optimum for race cars.
I had a friend that was an engineer that said Avgas burned too "dry". I don't really know what he meant. I always like hearing this, its for high altitude. Pretty sure all airplanes take off from the ground and also pretty sure taking off takes more power than actually flying. I use it, and love it. 12 to 1. The car doesnt get driven much, so when the fuel evaporates, it doesnt leave any "goo" in the carbs. You have to jet up a little, not much, but some to make it run right. Carry on. It was 4.50 a gallon at the airport near me. LOL then why does a place like denver, have a different formulation of fuel....
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: Spaceman Spiff]
#2792100
07/02/20 10:53 PM
07/02/20 10:53 PM
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Joined: Aug 2005
Posts: 6,003 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,003
Salem
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I use it in everything. My 12:1 Sport Bike, ATV's, Motocross Bike, 9:1 Magnum engines, 11:1 Gen 3, and all of the old cars. My fuel mileage is always better, they start quicker, and responsiveness at the pedal is noticible. I blend it to pump regular because I always question how long premium sits around at gas stations. "Pump premium" is likely stale and dropped a few points from what is claimed on the sticker. I'd rather the Haters keep hating on LL so there is more for Me.
Mo' Farts
Moderated by "tbagger".
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: Spaceman Spiff]
#2792119
07/02/20 11:22 PM
07/02/20 11:22 PM
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Joined: Aug 2003
Posts: 43,193 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,193
Bend,OR USA
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[quote=Dodgeguy101][quote=340Cuda]
then why does a place like denver, have a different formulation of fuel.... Avgas 100 LL should be the same formula and chemical makeup no matter who makes it and where it is sold from I've bought 100LL in Denver to get home from a trip there, no noticeable difference in the smell, price or performance on take off and climbing other than having to lean it out a lot more to get have 50 F degree rich of peak at WOT before take off I was taught to always run the motor up to WOT and lean it out to peak EGT and then richen it up 25 to 50 F rich of peak at any airport above 3000 Ft. above sea level before take off, especially in the summer when the density altitude can get way above the local altitude
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: A34]
#2792666
07/04/20 02:57 PM
07/04/20 02:57 PM
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Joined: Dec 2014
Posts: 304 Florida
Mark Whitener
enthusiast
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enthusiast
Joined: Dec 2014
Posts: 304
Florida
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Too much misinformation going on. Too dry, made for high altitude... garbage. 100LL is rates 100 octane lean, 130 octane rich, compares roughly to a 110 race fuel. I have a 461" SB2.2 engine in my dragster at 15.5 to 1, I buy 55 gallons at a time and either use Turbo 108 Plus or Race gas concentrate, a bottle to 55 gallons, My best time with Q16 is 4.71 in the 1/8, with aviation fuel 4.74. $85 for 5 gallons of Q16, under $20 for aviation fuel. I don't suggest it for street use as it is illegal. E85 is a good choice for street if available.
Mark Whitener [url=www.racingfuelsystems.com[/url]
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Re: Anyone use Avgas 100 LL in place of racing fuel?
[Re: Mark Whitener]
#2792881
07/05/20 10:00 AM
07/05/20 10:00 AM
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Joined: Mar 2018
Posts: 114 NW Indiana
powertrip
member
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member
Joined: Mar 2018
Posts: 114
NW Indiana
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Too much misinformation going on. Too dry, made for high altitude... garbage. 100LL is rates 100 octane lean, 130 octane rich, compares roughly to a 110 race fuel. I have a 461" SB2.2 engine in my dragster at 15.5 to 1, I buy 55 gallons at a time and either use Turbo 108 Plus or Race gas concentrate, a bottle to 55 gallons, My best time with Q16 is 4.71 in the 1/8, with aviation fuel 4.74. $85 for 5 gallons of Q16, under $20 for aviation fuel. I don't suggest it for street use as it is illegal. E85 is a good choice for street if available. ^^^THIS!!^^^ Back in the day, we could pull right up to the pumps and buy whatever we wanted, not anymore! I've been to every airport in a 50 mile radius, and not one will sell to you unless you pull your plane up to the pump. Sure would like to know where you can buy it by the 55 gallon drum.
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