Octane

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 3:45 am

Here in Colorado our standard is 85 for regular, 87 for mid, and 91 for prem. I heard that you folks on the east coast have 87 as the base standard. I wonder why they have it this way?

vrg3 · Post by **vrg3** » Mon Mar 07, 2005 3:50 am

Part of it is that at higher altitudes you can get away with lower octanes since the tendency to knock is less.

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 3:59 am

How is that? I would assume that since altitude is present our boost is slightly higher then yours at sea level or around there. Does that make sense?

jamal · Post by **jamal** » Mon Mar 07, 2005 4:08 am

vrg3 wrote:Part of it is that at higher altitudes you can get away with lower octanes since the tendency to knock is less.

Yeah. I still don't put 85.5 in my car when I'm driving through Utah and Idaho, though. I tend to only see it in small towns in the middle of nowhere.

THAWA · Post by **THAWA** » Mon Mar 07, 2005 4:49 am

It's not the boost as much as it is the air pressure, because not all cars are boosted. If I understand it right your 8:1 is less air pressure than our 8:1 at sea level. Sort of like us compressing 100 lbs of air to you compressing 90 lbs of air. Is that an accurate example or am I off base?

206er · Post by **206er** » Mon Mar 07, 2005 5:09 am

thats correct. on a NA engine, only so much of the atmosphere is sucked in on each intake stroke. since the atmosphere is less dense at higher altitude, less cylinder pressure is the result. octane rating refers to the resistance to detonation right? so with less cylinder pressure you are less prone to detonation, hence the lower octanes available.

BAC5.2 · Post by **BAC5.2** » Mon Mar 07, 2005 6:01 am

Our premium is 93 octane out here

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 6:54 am

Thanks guys. I learn more here then on any other board.

greg donovan · Post by **greg donovan** » Mon Mar 07, 2005 7:27 am

BAC5.2 wrote:Our premium is 93 octane out here

there are a couple places in MN that have 93. the highest i can get here is 92.

but that is getting to be around 2.15/gal.

AWD_addict · Post by **AWD_addict** » Mon Mar 07, 2005 7:31 am

87 is getting to be 2.15/gal!

evolutionmovement · Post by **evolutionmovement** » Mon Mar 07, 2005 7:39 am

We used to have 86 at Sunoco, but now the min is 87 and the max 94 (I think only at Sunoco again).

Steve

BAC5.2 · Post by **BAC5.2** » Mon Mar 07, 2005 7:57 am

I paid $2.18 a gallon for 93 today.

THAWA · Post by **THAWA** » Mon Mar 07, 2005 8:00 am

lucky ass

legacycontinues · Post by **legacycontinues** » Mon Mar 07, 2005 8:16 am

I hear it is going up 24 cents a gallon for now and possible higher. The min here in FL is 87 then up to 89 then to 92.

There is a place not far from here that sells 102 race fuel.

"Give me fuel, give me fire, give me that which I desire."

BAC5.2 · Post by **BAC5.2** » Mon Mar 07, 2005 8:18 am

Yea, we can get 100, 110, and 116 octane here. 100 octane is unleaded

I ran it on the dyno. That was a fun tank of gas.

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 8:44 am

I can fill up on 104 at a pump station in Longmont, Colorado.

206er · Post by **206er** » Mon Mar 07, 2005 9:32 am

really? cool! which one?

legacy92ej22t · Post by **legacy92ej22t** » Mon Mar 07, 2005 2:03 pm

Ya, we have Ultra 94 here at Sunoco's but I have a station down the road that sells 116 Cam 2 race fuel. Only catch is that you have to put it in a gas can, they won't let you just fill up.

Down at Beaver Springs, local drag strip where the F&S and Shootout take place, they sell 104, 108 (both unleaded) 110, 112, 116 (leaded). They also sell naaaaawwss.

legacycontinues · Post by **legacycontinues** » Mon Mar 07, 2005 3:14 pm

What does the 100+ stuff cost anyways???? Would it hurt anything to run that stuff in our cars?

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 7:23 pm

legacycontinues wrote:What does the 100+ stuff cost anyways???? Would it hurt anything to run that stuff in our cars?

I don't think it would hurt persay, but at the price of around $6.00 a gallon, I wouldn't be running any thought anytime soon.

J-MoNeY · Post by **J-MoNeY** » Mon Mar 07, 2005 7:24 pm

206er wrote:really? cool! which one?

I actually have no idea. My friend told me about it, but I have a contact who lives up there I'll check it out and get back to ya.

LaureltheQueen · Post by **LaureltheQueen** » Tue Mar 08, 2005 12:52 am

In washington our base is 87, mid is 89 and premium is 92, though apparently a few stations in the area have 97

legacycontinues · Post by **legacycontinues** » Tue Mar 08, 2005 1:47 am

I wonder what would happen if I ran half a tank of redline fuel treatment and the other half is seafoam.....You would be able to drink out of that engine...

evolutionmovement · Post by **evolutionmovement** » Tue Mar 08, 2005 2:26 am

Steve

AWD_addict · Post by **AWD_addict** » Tue Mar 08, 2005 7:13 am

Does anyone else with an NA run 89 (or whatever your mid grade is)?
Just wondering if I'm alone in my not-totally-necessary fuel habit.

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Octane

Octane