100LL Aviation Fuel Anyone Running it in Their Alfa - Alfa Romeo Bulletin Board & Forums

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post #1 of 26 (permalink) Old 04-21-2017, 11:48 AM Thread Starter
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100LL Aviation Fuel Anyone Running it in Their Alfa

I'm going to run it in my 1970 Mustang Boss 302.
100 Octane
Has Lead
No Ethanol
Less than $5 per gallon at a local airport.
The Boss community folks say it works and they speak highly of it.
What do you guys think about it for a Veloce spec Giulietta 1300??

1959 Alfa Giulietta Spider / 1970 BOSS 302 / 1967 Ford Galaxie 500 Conv. / 1999 BMW Z3 / 1963 Jeep CJ5
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post #2 of 26 (permalink) Old 04-21-2017, 12:05 PM
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A few points about aviation fuel.

It has a LOT of lead in it. The "LL" indication is in reference to the fuel it replaced, which was 100/130 octane. 100LL still has roughly 4 times the lead of aviation fuel 87 octane, which is increasingly hard to find.

To obtain the 100 octane rating with reduced lead levels, there are a lot of interesting chemicals that had to be added. My Mooney gas tank, which is created by spreading sealant around inside the wing, would last a long time between leaks with the original 100/130. With 100LL the sealant begins to break down and need repairing or a complete replacement typically about every 7 - 10 years. I'm not sure what all the chemicals are, but they may be worse than ethanol.

Aviation fuel has a lower vapor pressure than car gas. Among other things, this is to reduce vapor lock when flying at higher altitudes. It also makes aviation fuel harder to start than car gas.

It has a blue dye in it that WILL stain paint surfaces. If you act reasonably quickly, you can clean it off with rubbing alcohol, but even then the blue dye will eventually stain whatever it gets splashed onto.

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 30 years) Nearly 50 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...

Last edited by DPeterson3; 04-21-2017 at 12:22 PM.
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post #3 of 26 (permalink) Old 04-21-2017, 12:07 PM
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No ethanol is good for your vehicle.
Lead is bad for you and other living creatures.
100 octane may cause carbon buildup if used frequently.

PhilB
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post #4 of 26 (permalink) Old 04-21-2017, 12:09 PM
Richard Jemison
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Aviation gas

I use it mixed 50/50 with ethanol free 91 octane pump gas in the "Montreal Coupe"
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post #5 of 26 (permalink) Old 04-21-2017, 12:13 PM Thread Starter
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I wish I could get ethanol-free pump gas around here!
I'd just go ahead and use that.

1959 Alfa Giulietta Spider / 1970 BOSS 302 / 1967 Ford Galaxie 500 Conv. / 1999 BMW Z3 / 1963 Jeep CJ5
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post #6 of 26 (permalink) Old 04-21-2017, 12:17 PM
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I used it 1979-1981 when I worked at an FBO in San Diego County. We could take avgas that was drained out of planes' tanks, couldn't be put back in.
I never could tell any difference, other than that it was free.
Andrew
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post #7 of 26 (permalink) Old 04-21-2017, 12:18 PM
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Quote:
Originally Posted by vespaholic_com View Post
I wish I could get ethanol-free pump gas around here!
I'd just go ahead and use that.
You might be able to. Check here for a listing near you.

Ethanol-free gas stations in PA

current: '57 spider normale
previous: '74 spider in that weird yellow color

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post #8 of 26 (permalink) Old 04-21-2017, 12:22 PM Thread Starter
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@jburning17: I did check that link earlier.
It's only $75 +/- for 5 Gallons.
F-that!
It's only sold in 5-Gallon cans.

1959 Alfa Giulietta Spider / 1970 BOSS 302 / 1967 Ford Galaxie 500 Conv. / 1999 BMW Z3 / 1963 Jeep CJ5

Last edited by vespaholic_com; 04-21-2017 at 12:27 PM.
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post #9 of 26 (permalink) Old 04-21-2017, 12:28 PM
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Quote:
Originally Posted by vespaholic_com View Post
@jburning17: I did check that link earlier.
It's only $75 +/- for 5 Gallons.
F-that!
Woof! That's absurd!
I guess that I am lucky this time. There is a place about a mile away that has it for reasonable.

current: '57 spider normale
previous: '74 spider in that weird yellow color

I spend too much money on my car. It's Gordon's fault.
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post #10 of 26 (permalink) Old 04-21-2017, 03:01 PM
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I'm no chemist but I've run Avgas at times and it is fine. It won't harm your engine. It won't destroy anything. It's more octane than you need but running Super pump gas in a Chevy Tahoe is not money well spent either and doesn't harm it.. Legally airports cannot sell gas for road vehicles as they are supposed to keep a log on where it goes.. like aircraft.....not that it matters. It's their problem not yours if you get a tank full. I think the only advantage to it is shelf life. It won't turn to sugar and water in storage like 10% ethanol. 50-50 won't eradicate that problem just turn the gas to 5%. My advice is keep the ethanol fresh with 1/3 to 1/2 a tank on tap. Fill-ups put you in that zone where the gas can go bad if it is driven so occasionally. U.

Last edited by divotandtralee; 04-21-2017 at 03:05 PM.
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post #11 of 26 (permalink) Old 04-21-2017, 03:35 PM
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Quote:
Originally Posted by divotandtralee View Post
It won't turn to sugar and water in storage like 10% ethanol.
Oh for the love of...no. Just no.

Tom

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1963 Giulia Spider (1750 engine)
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post #12 of 26 (permalink) Old 04-21-2017, 03:42 PM
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so finish your point.. I'm all ears
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post #13 of 26 (permalink) Old 04-21-2017, 03:57 PM
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Well unless you've found a species of yeast that can live in 90% gasoline and that can run a reverse fermentation process to take energy and CO2 form the environment and use them to convert ethanol back into sugar, I'm going to say you're wrong on that whole sugar thing.

Beyond that I'm not contributing to another octane thread.

Tom

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post #14 of 26 (permalink) Old 04-21-2017, 04:27 PM
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I ran 'green' av gas in my 1300 Veloce SCCA racer for years until purpose designed racing fuel became available. It was hard to get but it worked well. Of course, that was a lot of years ago.
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post #15 of 26 (permalink) Old 04-21-2017, 04:36 PM
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