Sunoco GT 100

[Norm Clemmer]

Does anyone know of a gas station in the area that carries Sunoco GT 100 octane fuel? Also has anyone tried it and does it make a difference in performance?

[Al Betz]

Norm the only place that I know of is at E-Town at their track gas pumps.

Don't think it will improve performance unless you have a knock problem or want to run more boost.

[C5pilot]

I have a question... With such a wide margin between 93 & 100 octane, wouldn't your engine need to be professionally tuned to run the most efficient on 100? Perhaps his supercharged engine will gain more than the average setup? Anyone know?

[Bill Burkholder]

Norm... check with Bob Weiss. He gets Sunoco 10? at a gas station or and Agway some where in Montgo. Co.

[Joel Fellman]

Norm:
I had to buy a few gal. last time at E-town due to running low. Besides costing around $4. per gal., it didn't do anything for my carburated '76. But then, it may have a positive effect on your Vette!
Joel
Bill: I thought Bob was using treefrog gas from K-Mart.

[VetBoyZR1]

Forget the 100 octane stuff, go for the 116 octane race gas for $7.25 a gallon...

[Rick and Arleen Ball]

117 octane, OH YEAH! :D
If you wanna play, you gotta PAY.

[Tony B.96LT4]

Originally posted by VetBoyZR1
Forget the 100 octane stuff, go for the 116 octane race gas for $7.25 a gallon...

Now that's what I'm talking about!!!! :D

[Norm Clemmer]

As I understand it the only "racing gas" that is approved and won't hurt the cadallitic converters is the 100 stuff, so going higher with leaded fuel might screw up my converters. I am still wondering if there is a difference in performance between 94 and 100 octane fuel???

[Jeff Derstine]

Norm,
Contact Kurt Omensetter at Phoenix Performance on Rt 29 in Palm,PA. 215-679-2232

They run SCCA T-1 Corvettes out of there and use unleaded racing fuel.

Nice car ;bt

;hw Jeff

[Al Betz]

[i] I am still wondering if there is a difference in performance between 94 and 100 octane fuel??? [/B]

You probably will not see any performance improvement unless your computer is retarding the spark advance due to knock.

If you have a way of cranking up the boost you could probably go a few PSI higher with the 100 stuff which would obviously give you more ponies.

Have you tried contacting the Supercharger manufacturer to see what they recommend? Or Chris at East Coast Supercharging?

[Norm Clemmer]

Thanks for the advice "everyone" I am new to this Corvette stuff and am just getting my feet wet. I have also been thinking about sticking some 100LL avaition fuel in my Vette, but am afraid of screwing up the converters.

[C5pilot]

Originally posted by Norm Clemmer
I have also been thinking about sticking some 100LL avaition fuel in my Vette, but am afraid of screwing up the converters.

Norm, from what I understand, 100LL has 4 times the lead as the old leaded auto gas. If this is true, you'll damage the converters in the first tank. But please don't quote me, do some research to check it out. I will tell you this though... As you know all tanks and trucks get sumped for contamination daily at the airport. When I worked there I used to throw the couple quarts of sump fuel from the testing into my car thinking it was ok. It was only a matter of weeks that the converters clogged. Luckily, converters at the time had a long warranty and I got them replaced free. Well, the sump waste barrel starting filling up real fast after that!

[Rick and Arleen Ball]

Joe,
The LL must stand for LOTSA LEAD :rolleyes:

[C5pilot]

Originally posted by Rick and Arleen Ball
Joe,
The LL must stand for LOTSA LEAD :rolleyes:

The reason it is called Low Lead is because it replaces the 100/130 aviation fuel which contains 4 grams of lead per gallon. Here is a great article I found on this exact subject...


Why shouldn't I use AVgas instead of Racing Gasoline?
Some racers use aviation gasoline which is fine for certain applications but can have shortcomings. There are several grades of Aviation Gasoline [Avgas] that we must identify before going any farther.


Avgas 80/87: This product is used very low Compression ratio aircraft engines, contains 0.5 grams per gallon of lead, is red in color, and should not be used in any automotive engine due to a low Motor Octane number of about 80.


Avgas 100/130: This is a good qualilty product that can be used in high compression ratio automotive engines. It has both research and motor octane numbers slightly over 100. A motor octane number of 100 is BARELY ADEQUATE to satisfy most 12:1 compression ratio engines with a four inch bore. Avgas 100/130 is green in color, contains four grams of lead per gallon, and is becoming harder to find.


Avgas 100 LL: The LL stands for "low-lead" which means two grams per gallon, low compared to the Avgas 100/130 that it was designed to replace. It has research and motor octane numbers very similar to the 100/130 product previously discussed. The color is blue. This product has a high level of aromatics which can contribute to lazy throttle response and dissatisfaction of the consumer.


Avgas 115/145: This product was developed for high performance piston aircraft engines used in World War II and in the Korean War. It is very hard to find anymore due to lack of demand although it is of very high octane quality. The color is purple.


The remainder of this discussion will assume that our basis for comparison with racing gasoline is Avgas 100/130 since it is the only one of the group that is both available and has marginally acceptable octane quality. When the word "Avgas" is used, it will refer to Avgas 100/130.
Avgas is less dense than most racing gasolines. Instead of weighing about 6.l to 6.3 pounds per gallon like racing gasoline, it weighs 5.8 to 5.9 pounds per gallon. The racer must compensate for this by changing to richer [larger] jets in the carburetor when changing from racing gasolines to Avgas.

The other major difference is OCTANE QUALITY. Avgas is short on octane compared to most racing gasolines. Many racing engines with "quick" spark advance curves or with no centrifugal advance have more spark advance at low RPM than Avgas can handle. This extreme condition usually occurs when the engine is coming up to speed in first gear at wide open throttle. Inadequate octane quality is one of the fastest ways there is to destroy your engine through detonation. Pistons can be severely damaged during one acceleration where detonation is present and the racer may not know this until it is too late.

For maximum performance and power from a racing engine, racing gasoline will provide better performance than Avgas in most cases!
AVgas can be a good gasoline for some applications, but since most racers do not know the octane requirement of their engines, they would be better off with a "real" racing gasoline that will give them the overall resistance to detonation that they need to protect their investment. If someone has spent from $5,000 to $25,000 or more on their racing engine, it is foolish to "cheap out" on the gasoline.


Info found at http://www.241computers.com/ford/ContentExpress20-75-73.html#faq5

[C5pilot]

Here's another article that points out the importance of using aviation motor oil with avgas...

Additives
One problem with lead mixed with avgas is
that lead requires the addition of a bromine
compound to scavenge lead residue from the
engine.
The burning of the lead with the bromine
compound produces lead bromide that is
carried out with the exhaust gasses; however, a
small amount remains within the engine. This
lead bromide, when mixed with water, metals,
and lubrication oil, produces a corrosive liquid
very damaging to engine components.
Significant water is produced as fuel is
burned. The presence of water and the
corrosive properties of the lead bromide are
always lurking to damage an engine.
This lead bromide by-product is just one of
the reasons why aviation lubricating oil is
different from automotive lubricating oil. (Note
aviation lubricating oil, according to engine
makers’ specs, should always be used in
aircraft engines regardless of the type of fuel
used.)
Engines that are operated infrequently are
prime candidates for damaging corrosion from
this corrosive mixture o f water and lead bromide.
The corrosive effects of lead bromide
can be reduced by regular flying, frequent oil
changes according to manufacturers’ specs, and
preservation of engines not operated frequently
(at least once a month).
Additional additives to avgas are
compounds such as dye, for identification
purposes and aromatics such as benzol to resist
knocking. Toluene is added to make for low
freezing point, good volatility, and rubber
solvent properties less damaging than benzol.
In addition to these compounds there are other
compounds blended in small amounts with
avgas for reducing gum residue.

[Mike Campbell]

He He Joe! ;faz Betcha he's sorry he asked the question.;jj

[C5pilot]

I know what you mean Mike, but it's Mr Clemmer's thread, and I know he is a pilot. I felt the info was more than appropriate for someone who has easy access to avgas (you need an aircraft registration number). I'd just hate to see him damage that beautiful work of art. My appologies to everyone else who had to wade through all the mumbo jumbo.
;tt ;nd ;doa ;zz

[Bill Burkholder]

I just came back from K-Mart and the had a blue light special on "mumbo jumbo" boots, now I can wade but only to my knees.
The chest high "mumbo jumbo" boots were not on sale. :D :D :D :p

[Mike Campbell]

I'd be a little leary of too high an octane gas. It just might send Norm's supercharger into orbit! ;tt

[C5pilot]

Originally posted by Bill Burkholder
I just came back from K-Mart and the had a blue light special on "mumbo jumbo" boots, now I can wade but only to my knees.
The chest high "mumbo jumbo" boots were not on sale. :D :D :D :p

I just ran over to K-Mart and they were out of the mumbo jumbo boots. But they told me a pair of rubbers should work just as well as long as I don't go in too deep. ;jj

[Norm Clemmer]

OK, skip the AV gas, I am thinking I am going to pretend I live in France... spend five bucks a gallon and stick some of that Sunoco 100 Octane gas in my little blue Vette and see if I can feel a difference.