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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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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.
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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.
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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
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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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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: 924
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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: 4,098
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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.
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Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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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
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DAVID GAGNARD
Last edited by DAVID GAGNARD; 03-08-2009 at 05:39 PM..
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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
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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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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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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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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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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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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!
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Don't underestimate the predictability of stupid!
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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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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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03-09-2009, 07:36 PM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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I use Octane Supreme130 http://www.kemcooil.com/specials.php
1 case last's the summer. I also use it for my Ford tractor and my 72 p/u
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FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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03-09-2009, 07:59 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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Quote:
Originally Posted by Karl Bebout
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. |
I used to add a little Marvel to my blower motor as well. |
03-09-2009, 09:25 PM
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Senior Club Cobra Member
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Join Date: Sep 2002
Location: Montgomery,
TX
Cobra Make, Engine: CR 427 S/C, 351W, 5 Sp & KMP142 - 427 SO, 4 Spd
Posts: 2,212
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Not Ranked
I have been using the 100/110 LL Avgas I get at the small airport
where I get my skydiving fix. I just fill a 5 gal can and use my credit
card and do a rough blend of 1 : 10 with the 92 octane pump gas. It doesn't
sound like much but sure makes a difference in how the Cobra runs,
especially in 5th which is the Tremac .64. If the road is flat and level
it will cruise at 55 smoothly where without the juice I had to be going at
least 65 for it to run ok. I can go up H-3 in 5th no problem at 65 with it,
and it is just over 2,000 rpms at 80 in 5th. I'm sure the c/r is less than
10:1 but not by much. The 100LL is between $5 & 6/gal here but I also
get about 3 mpg better so I figure I'm getting the better performance for
no extra cost. Oh, and I love the smell of that AVgas!
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Flip
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03-14-2009, 10:33 AM
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CC Member
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Join Date: Oct 2002
Location: Fairfield,
CT
Cobra Make, Engine: HM-2027 / 427 SO
Posts: 817
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Not Ranked
We have both leaded and unleaded VP 110 octane at our local Sunoco. During spring and summer the 110 unleaded is in the pump. Leaded is in the garage in the drum. Both are $9.98 a gal. Right over the hill from me here. Sweet.
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03-14-2009, 11:39 AM
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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
Quote:
Originally Posted by FFR428
We have both leaded and unleaded VP 110 octane at our local Sunoco. During spring and summer the 110 unleaded is in the pump. Leaded is in the garage in the drum. Both are $9.98 a gal. Right over the hill from me here. Sweet.
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That's pretty expensive. I am paying $7.98 a gallon right now for F&L 111 octane from the pump in So.Cal. |
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