just wanted to let y'all know that in OKC, OK there is a Shell gas station that sells 101 octane at the pump. so if anyone lives there or may be going through there here you go. directions and location are:

go north from I35 and connect onto US 77 (Broadway Extension)

travel about 8 miles and exit NW 63rd street and go west for about 3 miles.

the Shell station is on the NW corner of NW 63rd and Western blvd.

only drawback is that they close i think around 9pm on weekdays, 6pm on saturdays, closed on sundays.

hope this helps some folks

q

 

wasn't there just a post about how higher octane really isn't better for your car? I'm pretty sure 101 is too much, I think most cars probably run better around 93 octane.

 

alot depends on if you are getting knock and if you are FI or Spraying a big shot

 

Is 101 too much? For 98% of the street driven cars out there...probably.

A lot of people think that higher octane fuel is better or a higher grade since they pay more for it. They also think it will give them more power because it burns better/hotter. Some even think it'll give a more complete combustion.

None of this is true.

Higher octane means it will not combust as readily. It takes more heat/compression to ignite it.

It is not a higher grade and it is not cleaner. What you are paying extra for are the additives to make it not ignite as easily.

It does not burn hotter, just takes more to get it started burning. Where any extra power comes from is the ability to increased compression or advanced timing further.

It doesn't even burn cleaner. If you don't really need higher octane then your car will actually be a bit dirtier as far as smog is related.

 

I live in north georgia where we have 110 octane.(2 minutes from strip)It is illegal to pump into into your car though unless it is on a trailer.

 

SO this is how im understanding, no matter what gas you put in your car if its higher then recommended then you will gain nothing, includeing hp? Includeing race fuel? Also lets say I put CAM 2 in a 4 cylinder, will it yeild more power, blow the engine?

Cam 2 is 110 leaded race fuel.

 

my bad but i was just saying it in case anyone had "special" cars and such that require it. i wasnt gonna use it in my stock Z. but in 1997 i had a 92 nissan sentra 4 banger and filled it up from the same station and those little 13 inchers (actually 1 tire) spun like a &@#%^^. never filled it again with that but i can vouch that the car ran like a scalded cat.

 

I sometimes go to that gas station because it is one of like two that sells 93. I dumped in 2 gallons of the 101 before and didn't notice a damned thing, but then again I'm stock.

 

actually, what you're paying for is a higher concentration of octane vs. heptane. 87-octane fuel is 87% octane, and 13% heptane (roughly; not counting additives) it gets a little more complex as you approach 100-octane. but the octane rating doesn't have anything to do with additives, it's the characteristics of the fuel mixture.

over 100-octane you have to add lead to the fuel to increase the resistance to detonation. i'm no chemical engineer, but i know a little bit. what i don't know, is if ALL of the fuels over 100-octane contain lead, or if it's the higher octanes, 110+ that use lead.

i would definitely read that pump pretty well to make sure it's still unleaded or you'll be looking at buying new cats.

edit: after doing a little more research, the '100 point' octane level is based on an isomer of octane, 2,2,4-Trimethylpentane (or, isooctane). so it looks like anything below 100-octane is a mixture of octane vs. heptane, and anything over 100-octane is a mixture of isooctane and lead.

http://chemed.chem.purdue.edu/genche...anic/coal.html

 

Actually no.

Octane is measured relative to a mixture of isooctane (2,2,4-trimethylpentane, an isomer of octane) and n-heptane. An 87-octane gasoline, for example, has the same octane rating as a mixture of 87 vol-% isooctane and 13 vol-% n-heptane. This does not mean, however, that the gasoline actually contains these chemicals in these proportions. It simply means that it has the same autoignition resistance as the described mixture.

A quote from the website you referenced:
"Octane numbers compare a gasoline's tendency to knock against the tendency of a blend of two hydrocarbons heptane and 2,2,4-trimethylpentane, or isooctane to knock."

So they COMPARE the gasoline to a blend of these 2 hydrocarbons. Not blend these 2 hydrocarbons into gas to increase the octane.

Another quote form your reference:
"By 1922 a number of compounds had been discovered that could increase the octane number of gasoline. Adding as little as 6 mL of tetraethyllead (shown in the figure below) to a gallon of gasoline, for example, can increase the octane number by 15 to 20 units. "

Additives are what raises the octane of gasoline. Soem examples of these antidetonants would be Triethyllead (aka leaded gasoline), Methyl tert-butyl ether (MTBE),methylcyclopentadienyl manganese tricarbonyl (MMT - not blended into the US gasoline but is else where. It is also an ingredient in the good octane boosters)? People even run Toluene or Xylene for an octane booster.

I'm not saying ALL the gasoline additives are octane boosters because there are many more that do other things.

 

yeah i knew that was coming.. i just didnt like what you said in your original post, i didnt think it was accurate, so i brought some depth to this thread. thanks for clearing that up!

 

If your engine has no detonation, then higher octane will not help you any.

There is a lot of race fuel that is leaded. This can actually hurt performance of modern cars because it'll kill your O2's and cats.

Think about what you need for combustion. Fuel, ignition and OXYGEN. The only fuel that will give you more power is oxygenated. Alcohol fuels are good examples. They're just a carbon chain with -OH (oxygen hydrogen ion) on the end. The catch is that you better have your engine built for it.

Adding oxygen is one reason why nitrous (N20) works like it does. You're adding 1 atom of oxygen per molecule of N2O. Put more oxygen on a fire and watch it grow. Plus its cold and you do dump more fuel into the engine when spraying too. Well, you best hope you do.

Combustion is an oxidation reaction.

 

Whats not to like? Its a simplistic version. You are paying more for the additives that increase the octane, which means it won't ignite as easily as lower octane fuel. Preignition is detonation. The other additives (detergents etc) are in the lower octane fuel as well. The lower octane fuel is not a lesser grade.

 

I live in the OKC area and have 12.2-1 compression in my LT stroker, therefore I can actually benefit from the high-octane gas. However, we have several places to buy high-octane unleaded gas in our area. Typically I use Sunoco GT-Plus, which is 104 octane unleaded. The GT-Plus is available at TVRP Noble and Simons Petroleum on Morgan road. Red Rock Distributing NW 50 also has a complete line of high octane fuels. And there are several other places here in OKC.

WD

http://www.cardomain.com/ride/2189634

 

13-1 and pumpgas. Wonder how much I could pick up with the good gas. Ill make the trip up there sometime, but it would be an hour round trip for me. Need a 10 gallon jug and just add 2 every fillup or something.