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03-06-2009, 11:53 PM
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CC Member
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Join Date: Jul 2006
Cobra Make, Engine:
Posts: 49
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Not Ranked
Aviation fuel
Anyone using 100LL for 12-1 motors? Should it require any additives? The blue stuff is getting to expensive to cruise with.
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Advertising
03-07-2009, 12:00 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Find a station that sells 100 octane unleaded. You'll be VERY happy with the way it runs.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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03-07-2009, 04:55 AM
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CC Member
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Join Date: Jul 2001
Location: Senoia,
Ga.
Cobra Make, Engine: 427SO with big twin autolite inlines on custom intake, jag rear, top loader, wembeldon white, guardsmen blue stripes
Posts: 3,155
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Not Ranked
OR!, you can pickup a 5 gal. can of toulene (117 octane) mix 2 gal with 8 gal of 94 and have a little over 100 octane. The oil compaines use it to raise octene levels.
__________________
Perry
Remember!, there's a huge difference between a 'parts' changer, and a mechanic.
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03-07-2009, 05:28 AM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
Here's the best and most unbiased article on this subject that I have found on the web.
http://www.idavette.net/hib/fuel/page2.htm
__________________
Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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03-07-2009, 05:39 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine:
Posts: 52
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Not Ranked
You Betcha'
I was there when it happened and the truth of the matter is that Shell oil wanted to stop stocking 80 octane avgas. Without any testing they simply took 100 octane Avgas and RAISED the lead content to 6 Grams per Gallon and called it "Low Lead"
By doing this it could be run in the older aviation engines. The FAA bought the idea and 100 octane Low Lead was borne.
That is twice the lead per gallon than pump gas ever had. You can count on having to deal with all of that lead if you run the stuff in any car.
Last edited by 727pilot@usa.co; 03-07-2009 at 05:40 AM..
Reason: spelling
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03-07-2009, 06:36 AM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 922
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Not Ranked
where can you buy shell 100 in the US
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03-07-2009, 09:16 AM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by saltshaker
where can you buy shell 100 in the US
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A few gas stations still sell 100 octane. Do a search in Google for 100 octane and the area where you live, and you'll find auto forums with details on where to find it.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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03-07-2009, 09:45 AM
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CC Member
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Join Date: Jan 2001
Location: Post Falls,
ID
Cobra Make, Engine: Everett-Morrison
Posts: 111
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Not Ranked
I don't recommend AvGas
Back in 1976, I had a '65 Corvette 350ci with 11:1 CR . I decided to see how well AvGas would work, so I just drove up to the fueling area at the Van Nuys Municipal Airport in CA. Back then, 100+ Premium was just about 40 cents/gal. and the AvGas was double that. I think I had about 8 gal. pumped in and drove off. The Vette did not like that stuff at all, if I recall, it was sluggish and a little hard to start, and after a REALLY short time and not wanting to damage the motor, I topped off the tank with premium gasoline to dilute that AvGas, and eventually she was running better.
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03-07-2009, 11:22 AM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Superformance
Posts: 4,527
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Not Ranked
Most FBOs will not pump AvGas into a car or container as it is not legal....no road taxes, etc.
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03-07-2009, 12:21 PM
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CC Member
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Join Date: Dec 2000
Location: Salt Lake City, UT USA,
Posts: 234
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Not Ranked
100LL is a tricky subject. I buy it at the local airport (where they are used to seeing me), but they do get really nasty about putting it in road-going vehicles, so I would usually fill a couple of 5 gallon containers, in addition to the airplane. Only had one old grouch rag me for it. On the negative side, I saw no real improvment in power over 87+ and a SMALL amount of 104+ octane booster. I empasize small, because too much octane booster makes your plugs look like you are burning chocolate syrup. 100LL is dyed to be able to distinguish it from jet A, and that dye is forever coloring my intake manifold....poop.
BigMike
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03-07-2009, 01:33 PM
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CC Member
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Join Date: Feb 2001
Location: St. Louis, Missouri,
MO
Cobra Make, Engine: SPO 2715
Posts: 1,648
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Not Ranked
I had an 11:1 ratio in my 418, and it knocked on 93 octane.
I started using this:
http://www.klotzlube.com/storeProdDetails.asp?pi=50
This stuff works (unlike the crap at Auto Zone), and really can raise pump gas 10 "FULL" points.
Try it.
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03-07-2009, 09:54 PM
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CC Member
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Join Date: Jul 2006
Cobra Make, Engine:
Posts: 49
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Not Ranked
T/lead
I understand 100LL has 2 grams. 100/130 has 4 grams.
Unleaded 100 would be GREAT!
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03-07-2009, 10:08 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 03-07-2009 at 10:14 PM..
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03-08-2009, 11:18 AM
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CC Member
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Join Date: Jul 2006
Cobra Make, Engine:
Posts: 49
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Not Ranked
Again 8 or 9 Dollars a gal. for race gas!
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03-08-2009, 02:24 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
I have used 100LL in a few boats I have owned, and the stuff works great. One was a 510 C.I. blown/intercooled Chevy with almos 900 hp, the other two were high performance 300hp outboards. You can buy the stuff straight from the pump in Lake Havasu City at several stations. Never had a problem.
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03-08-2009, 03:03 PM
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CC Member
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Join Date: Jan 2004
Location: Shawbury,
Posts: 325
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Not Ranked
Why not jet up the carb and use E85?
It's cheap and it's got 104 octane, plus the cooling effect of alcohol.
That's what I would do if it was available locally.
Simon
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03-08-2009, 04:08 PM
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CC Member
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Join Date: Jul 2006
Cobra Make, Engine:
Posts: 49
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Not Ranked
With E-85 I'll have to change tank ,pump,lines. and its still suppost to have corrosion problems with my carb. I would also have lost 30% of my milage. It may be the only was to get the cost down though.
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03-08-2009, 04:30 PM
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CC Member
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Join Date: Sep 2002
Location: Waddell,
AZ
Cobra Make, Engine: Alum bodied CSX4266, fuel injected alloy 472, 663 hp Engine built by Dralle. Suspension by Tom Barnard
Posts: 938
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Not Ranked
I used 110LL in my last boat too. My motor was built to run on the stuff. 540 C.I., 1050 horse, blown and intercooled Chev. and never had a problem either!
__________________
Don't underestimate the predictability of stupid!
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03-08-2009, 05:34 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
Quote:
Originally Posted by saltshaker
where can you buy shell 100 in the US
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Check out any Shell bulk plants/distributor in your area, they may or may not sell it to you, best bet is ask for it a drum at a time.....
I get mine by the drum, that is the least they will sell and WILL NOT pump it in any vehicle.....
On a side note concerning using it, this is what I've seen:
At my home road course, there is one car which is a mid 90's Busch car, 12.5 to 1 chevy motor, he's been racing the car for five years now and has run nothing but 100LL AVGAS in it, to date, no problems.....there's at least a dozen other racers using it also, same results.....
Main reason I use it in my race car is the distributor is also a
Mustang guy/friend and sells me the stuff at his cost, I only use one drum a year... I mix it with a locally blended 110 leaded gas 50/50....
Last gas I bought, the 110 race gas was about $8.00 a gallon and the av gas was a whopping $3.45 per gallon by the drum....I end up with two drums of 105 leaded race gas which easily makes me the race season......
Started using av gas back in the early 90's on a dirt track car when the local Shell distributor was a sponsor, he would give us 10 gallons of any fuel he had for each race night,we started with 93 octane premium and he suggested we try the avgas, and it was free, so we used it with no problems... he told us he sold avgas to at least a dozen or more local racers, as long as they brought their own containers...
BTW: my 18 hp lawn mower loves it!!!!!!!!!! 
David
__________________
DAVID GAGNARD
Last edited by DAVID GAGNARD; 03-08-2009 at 05:39 PM..
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03-08-2009, 06:47 PM
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CC Member
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Join Date: Jun 2001
Location: Mesa,
AZ
Cobra Make, Engine: ERA #2119 289FIA
Posts: 5,380
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Not Ranked
I've used av gas from the local airport and they call it 105 leaded. I add one ounce of Marvel Mystery Oil per gallon, for a little cylinder lubrication, and have never had any problems in either my 10 1/2 Rat or my 12 1/2 destroked 400 SBC. Up until the last year or two, I used to be able to drive the Cobra up to the pump but now I have to just fill a can. Guess the tax man was afraid he wasn't getting his pound of flesh.
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Karlos
"In the Land of the Pigs, The Butcher is King"
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