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Av-gas question
#534431
11/23/09 11:22 AM
11/23/09 11:22 AM
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Joined: Apr 2009
Posts: 183
Canada
Mofopar
OP
member
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OP
member
Joined: Apr 2009
Posts: 183
Canada
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I've read up on the av-gas threads and I think the 100LL seems like a cheap alternative (way cheaper actually) to all out race gas and at 100 octane is enough for my 12:1 motor on the street.
There were some concerns about it being a "dry" fuel (whatever that means) and that adding fuel treatment like Marvel Mystery Oil would be good insurance and not detrimental either.
I can't seem to find the MMO up here in Canada. Any suggested alternatives? Should I even bother?
Last edited by Mofopar; 11/23/09 11:22 AM.
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Re: Av-gas question
[Re: Mofopar]
#534432
11/23/09 12:53 PM
11/23/09 12:53 PM
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Joined: Aug 2003
Posts: 43,127
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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100LL here in the states has a very low specific gravity, usually around .690. It also has additives to increase the shelf life to 18 months  It was not design or intended to be ran much above 2700 RPM(burn time?) also so that seems to be a problem. I use to use the 115/1345 and when that went away we used the 115/130 octane. I found that all of my stock Mopar M.W. intake and exhaust valves where pitted after using that fuel for two years of drag racing only at or close to twice a month  Needless to say I don't use it anymore in a high compression motor, I have mixed it with pump gas on occasion to improve the shelf life for sitting over the winter in cars that I don't drive in the winter I would not add any oil to any gas unless it was for a two stroke motor  Alcholol race fuel is a different story 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Av-gas question
[Re: Mofopar]
#534433
11/23/09 01:05 PM
11/23/09 01:05 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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I ran it for a few years in a 12.2:1 440 iron headed motor on the street and strip. Ran 11.40s at 117 mph on AvGas and the same on VP 110. I'd run it mixed 50/50 with pump 93 on the street. I never added any oil to the fuel and never had any problems. CHIP
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'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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Re: Av-gas question
[Re: Bob_Coomer]
#534435
11/23/09 02:58 PM
11/23/09 02:58 PM
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Joined: Jan 2003
Posts: 1,142
Central New York
slippery440
Crybaby440
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Crybaby440
Joined: Jan 2003
Posts: 1,142
Central New York
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Everytime I see a post about AV gas I have to bit my lip.But I just got to know. 1 When people are building a street motor/ strip why make the compression more than 10 to 1? Any body heard of Pump Gas Motors and the HP that can be made? 2 Knowing that you have a 12 to 1 motor and you have to run "race gas" and it cost alot of money why try to cheap out by running AV gas? You had the money to build the motor now pay for the right gas. 3 AV stands for??????? Not race car fuel.I have never seen a airplane at a dragstrip try to run a 1/4 mile.  4 Why would you want to add oil to AV gas so you can run it?Put the oil rings in wrong and run all the AV gas you want to.  RANT OVER 
If the MODS did their job I would not be hitting the notify MOD button. LOL
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Post deleted by Defbob
[Re: Mofopar]
#534437
11/23/09 03:53 PM
11/23/09 03:53 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: Av-gas question
#534439
11/23/09 04:18 PM
11/23/09 04:18 PM
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Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
WadeMetzinger
top fuel
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top fuel
Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
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I've ran it for over 2 seasons so far without any trouble. Ran 11.35 at 118mph in my wife's 390cid (318 stroker) with Eddy heads. I built the motor to be able to run on the street, 10.8 - 11 to 1 compression but since we race it hard with a lot of timing I figured the extra octane would help prevent detonation.
I run it straight but towards the end of the year I may add some of the top lube that I used in my alcohol just for some extra lubrication.
We are getting it for around $3.50 and 110 at the track is $8 so I like it just fine. I'll pull the heads off this winter and look for pitting or other damage and if I see any I'll stop using it.
Wade Metzinger 918-809-0987 71 Cuda 9.28@145 -1s, Pglide 68 Cuda 10.64@124 1.45 60's 318->390 eddys Moparts discount code on WIX - moparts www.Filter1.com
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Re: Av-gas question
[Re: Mofopar]
#534440
11/23/09 04:36 PM
11/23/09 04:36 PM
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Joined: Jan 2003
Posts: 25,750
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,750
Rio Linda, CA
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Well, one thing you can count on with each new avgas thread is the misinformation it generates.
The INTERNET, the MISinformation superhighway
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Re: Av-gas question
[Re: WadeMetzinger]
#534441
11/23/09 04:43 PM
11/23/09 04:43 PM
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Joined: Aug 2005
Posts: 5,999
Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 5,999
Salem
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Have been running 100LL at 50/50 to pump fuel this year and have been pleased with the results. I gradually backed it off where it is sitting at about 30% Av gas and still have no problems. I can say the difference was noticible in my 340 as far as starting, throttle response, and a bit more power. I believe that there is less screwing around by the petroleum distillers making Av gas. Pump fuel on the other hand, they don't care.......water it down, put filler in it, whatever, just call it gas. 
Mo' Farts
Moderated by "tbagger".
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Re: Av-gas question
[Re: ITSDUSTA416]
#534448
11/23/09 11:12 PM
11/23/09 11:12 PM
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Joined: Apr 2009
Posts: 183
Canada
Mofopar
OP
member
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OP
member
Joined: Apr 2009
Posts: 183
Canada
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Regarding the cost issue, at roughly 3X the price of av, race gas feels like a complete and total fleecing. I too skeptical to buy into the idea that you need race gas and only race gas after 10:1 comp ratio and it seems more agree with this than don't. I didn't build this thing myself but bought the car as-is to get my feet wet racing.  Although I did have had the car WOT to 6800rpm on the street a couple times and didn't notice any detonation running 94. Thanks for the input!
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Re: Av-gas question
[Re: Mofopar]
#534450
11/24/09 11:01 AM
11/24/09 11:01 AM
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Joined: Jan 2003
Posts: 16,923
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,923
NC
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Quote:
Regarding the cost issue, at roughly 3X the price of av, race gas feels like a complete and total fleecing.
 That is one reason I switched to E85 (ethanol) in 2008, the cheap hot rod fuel. And my engine is 13.5 CR.
I don't know about AV gas other than the "100" octane rating uses a different test than car gasolines and the specific gravity etc may require a different mixture (jetting). After running pump gas, race gas, alky, and E85, I can't help but believe a properly setup engine can run AV gas too.
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I have seen many aircraft motors in tractor pullers association pulls.I still bet they either run alcohol or race fuel. 
