Re: Airplane/aviation fuel
[Re: DusterKid]
#2465899
03/13/18 05:51 PM
03/13/18 05:51 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Leaded fuel has lead and new engines have sensors and the will quit.. thats the big factor..if you run O2 sensors... dont bother (LL is low lead)
Last edited by MR_P_BODY; 03/13/18 05:53 PM.
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Re: Airplane/aviation fuel
[Re: DusterKid]
#2465917
03/13/18 06:25 PM
03/13/18 06:25 PM
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Joined: Aug 2011
Posts: 2,904 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,904
Pattison Texas
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do you run the 100LL or JetA? Jet fuel (there's variants, but a very common one is known as Jet A) is really close to regular old diesel fuel. And, for that matter, kerosene. You can even run it straight in your diesel car or truck, though it doesn't lubricate as well so if you do, you'd want to add some sort of lubrication additive.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Airplane/aviation fuel
[Re: DusterKid]
#2466006
03/13/18 08:47 PM
03/13/18 08:47 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
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Joined: Feb 2010
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Phila. Pa.
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It's true that 100LL has lower density than most pump fuels. However that is also true of many race fuels. Temperature plays a role in density specs but here's some published numbers to give some idea of the variations. Specific gravities 100LL, 0.714 to .719 Pump Gas .74 typical Sunoco GT .734 Sunoco GTX .764 Sunoco Standard .729 VP Vintage leaded .715 VP C9 .718 VP Blaze 100 .746 Race fuel info came from Sunoco Race Fuels and VP websites. Pump Gas came from CRC E67 fuel Study (Durbin et al) and similar sources. Av Gas from Fuel Mfc. Bulletins eg. Shell Au 100LL pdf Distilation curve falls between typical street fuels and the race fuels I looked at. Posted a graph here: https://www.tapatalk.com/groups/racingfu...579.html#p12657
Last edited by Mattax; 03/13/18 08:54 PM.
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Re: Airplane/aviation fuel
[Re: Mattax]
#2466034
03/13/18 09:29 PM
03/13/18 09:29 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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It's true that 100LL has lower density than most pump fuels. However that is also true of many race fuels. Temperature plays a role in density specs but here's some published numbers to give some idea of the variations. Specific gravities 100LL, 0.714 to .719 Pump Gas .74 typical Sunoco GT .734 Sunoco GTX .764 Sunoco Standard .729 VP Vintage leaded .715 VP C9 .718 VP Blaze 100 .746 Race fuel info came from Sunoco Race Fuels and VP websites. Pump Gas came from CRC E67 fuel Study (Durbin et al) and similar sources. Av Gas from Fuel Mfc. Bulletins eg. Shell Au 100LL pdf Distilation curve falls between typical street fuels and the race fuels I looked at. Posted a graph here: https://www.tapatalk.com/groups/racingfu...579.html#p12657 I've used and tested 100 LL for a long time, I bought my first airplane in 1989. I've never used or tested 100LL from east of the rocky mountains so I'm not sure how 100 LL from there would test as far as specific gravity, all of the 100 LL I've tested has been right at .690, never above including when sitting during the winter in the airplane fuel cells inside the hangar I use to buy and use 115-135 Avaition and even some 130-145 octane aviation fuel back when the airlines still used big HP piston engines in their airplanes, that stuff had a lot of lead in it As far as the additives used in 100 LL it has a standard shelf life of up to 18 monthes Todays pump swill usually has 90 days max life exposed to air n your car tank OP as far as using 100LL in a race car be prepared to change your jetting, spark plug heat range and ignition timing to make the motor not hurt itself on 100LL E85 is a much better choice in my opinion for todays world of drag racing
Last edited by Cab_Burge; 03/14/18 04:35 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Airplane/aviation fuel
[Re: Cab_Burge]
#2466054
03/13/18 10:03 PM
03/13/18 10:03 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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Cab, That's very interesting. Maybe some of the other aviation guys will chime in on the density. I also looked at BP & Exxon but that was a while back and did not take notes about temperature or methods or if they were even mentioned.
Bottom line does seem to be that jetting will likely need to be adjusted for optimum performance. Probably true for most any change in fuel.
Last edited by Mattax; 03/13/18 10:07 PM.
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Re: Airplane/aviation fuel
[Re: DusterKid]
#2466082
03/13/18 10:56 PM
03/13/18 10:56 PM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
Joined: Sep 2015
Posts: 1,096
Australia
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I run it Down Under when ever I get the chance, our cars seem to run better on it, 2 mph last time i changed over.
1963 Plymouth Max Wedge 1971 Barracuda
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Re: Airplane/aviation fuel
[Re: DusterKid]
#2466358
03/14/18 01:51 PM
03/14/18 01:51 PM
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Joined: Dec 2006
Posts: 235 Tucson AZ.
RADAMX
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 235
Tucson AZ.
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For the jet changes, is it typically take a larger or smaller jet? Its been awhile but i think it was 2-4 larger Of course you will need to Check your plugs for the tune up
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Re: Airplane/aviation fuel
[Re: AndyF]
#2466405
03/14/18 03:08 PM
03/14/18 03:08 PM
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Joined: Jun 2003
Posts: 2,423 Weatherford, Texas
RapidusMaximus
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Joined: Jun 2003
Posts: 2,423
Weatherford, Texas
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It works okay in most applications but you have to watch out for the lead. It will kill O2 sensors over time. It also changes the way you read plugs. I don't think I'd use it in a serious race engine but I know lots of guys who mix it with unleaded to give an old muscle car a little more octane. X2...this is the way I run it in my GTX, seems to work fine, been running it this way for the last year or so..."seat of the pants" feel tells me it pulls a little harder than straight super unleaded...and the exhaust aroma is an added benefit
1968 Plymouth GTX 1974 Dodge P/U Long Bed Stepside 318 2019 Ram 2500 6.4, auto, 4WD
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Re: Airplane/aviation fuel
[Re: DusterKid]
#2466418
03/14/18 03:35 PM
03/14/18 03:35 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,492
Marion, South Carolina [><]
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I ran 100LL AvGas for a long time in a 12:1 440 street/strip combo. Ran great and never hurt anything. Know a local guy that ran it for YEARS in a 13:1 BB Chevy w/ 2 stages of nitrous. One of those guys that bought up leftover parts people were scared to run, but built an engine out of them that ran for years...too cheap to buy race fuel, so he always ran Avgas. Worked great for him.
This is one of those subjects that 99% of the people telling you not to run it have zero experience w/ it and are just repeating hearsay.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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