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Octane

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Topic: Octane
Posted By: WGP guy2
Subject: Octane
Date Posted: 13 July 2007 at 7:52pm
So, I just learned this today.  Who knows what the octane measurement of gasoline means (without looking it up).



Replies:
Posted By: Dye Playa
Date Posted: 13 July 2007 at 7:54pm
resistance of gas before it's supposed to explode, i think.

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Posted By: WGP guy2
Date Posted: 13 July 2007 at 7:56pm
Originally posted by Dye Playa Dye Playa wrote:

resistance of gas before it's supposed to explode, i think.


Kind of, I'm looking for a certain term though.


Posted By: Benjichang
Date Posted: 13 July 2007 at 8:07pm
Ugh. I can answer this, but I just finished Organic Chem 1 today and I'm not in the mood.

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Posted By: Brian Fellows
Date Posted: 13 July 2007 at 8:11pm
HOW MUCH IT MAKES YOU TRIP BALLS WHEN YOU HUFF IT LOLOL


Posted By: Panda Man
Date Posted: 13 July 2007 at 8:15pm
83 - 89

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Posted By: usafpilot07
Date Posted: 13 July 2007 at 8:27pm
I played with an Octane shocker today.  Just a fun coinkydink.

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Posted By: choopie911
Date Posted: 13 July 2007 at 8:30pm
It has something to do with airplanes, amirite??


Posted By: WGP guy2
Date Posted: 13 July 2007 at 8:50pm
Originally posted by choopie911 choopie911 wrote:

It has something to do with airplanes, amirite??


If the airplane happens to be a piston plane, then yes.

Its the fuel's resistance to detonation. 


Posted By: choopie911
Date Posted: 13 July 2007 at 9:07pm


Posted By: Brian Fellows
Date Posted: 13 July 2007 at 10:57pm


Posted By: Enos Shenk
Date Posted: 13 July 2007 at 10:57pm
Originally posted by WGP guy2 WGP guy2 wrote:

So, I just learned this today.  Who knows what the octane measurement of gasoline means (without looking it up).


Without looking it up, and without reading any responses here:

Its the rating of the temperture the gas will handle before ignition. It helps prevent pre-ignition from compression mainly.


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Posted By: choopie911
Date Posted: 13 July 2007 at 10:58pm
shenk ftw. Anyone surprised?


Posted By: Dye Playa
Date Posted: 13 July 2007 at 11:00pm
Originally posted by WGP guy2 WGP guy2 wrote:



Its the fuel's resistance to detonation. 


Originally posted by Dye Playa Dye Playa wrote:

resistance of gas before it's supposed to explode, i think.


explode=detonation, just to let you know.


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Posted By: Enos Shenk
Date Posted: 13 July 2007 at 11:02pm
Originally posted by Dye Playa Dye Playa wrote:


explode=detonation, just to let you know.


In general terms, yes.

But in regards to gasoline engines, the term Detonation means something entirely different. Its a slangish term for pre-ignition, where the fuel/air mix ignites before the piston clears top dead center. It puts huge stress on the piston, connecting rod, and crankshaft.

Its also called "Knock"


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Posted By: GI JOES SON
Date Posted: 13 July 2007 at 11:14pm

Originally posted by choopie911 choopie911 wrote:

shenk ftw. Anyone surprised?

nope, enos is the mechanical guy around here. chances are wpg is sitting there going, aww shucks. or something to that effect using language that cant be typed



Posted By: WGP guy2
Date Posted: 13 July 2007 at 11:32pm
Originally posted by GI JOES SON GI JOES SON wrote:

Originally posted by choopie911 choopie911 wrote:

shenk ftw. Anyone surprised?

nope, enos is the mechanical guy around here. chances are wpg is sitting there going, aww shucks. or something to that effect using language that cant be typed



Nah, I didn't think about it at first, but shenk or bearclaw would be the first people I would think would know.  Hopefully you know it too.

A CFI asked me the question today about what octane means as an off the wall question in review for my oral exam.


Posted By: __sneaky__
Date Posted: 14 July 2007 at 12:15am
Most any major car guy will tell you, the fuel air mixture doesnt "exsplode" it combusts. personally I dont see the differance, but apparently they sure do...

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Posted By: Ghost-Rider
Date Posted: 14 July 2007 at 12:21am
Combust is more like ..just igniting vs. EXPLOSION.

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Posted By: Project Irene
Date Posted: 14 July 2007 at 1:19am
Yes, try advancing the timing on your vehicle.


Posted By: __sneaky__
Date Posted: 14 July 2007 at 1:23am
Originally posted by Project Irene Project Irene wrote:

Yes, try advancing the timing on your vehicle.
heh... how bout not.

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Posted By: travis75
Date Posted: 14 July 2007 at 9:24am
burn fast vs. esplode

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Posted By: __sneaky__
Date Posted: 14 July 2007 at 3:15pm

^makes sense



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Posted By: FROG MAN
Date Posted: 16 July 2007 at 12:30pm
that seems like a very watered down answer

Originally posted by wiki wiki wrote:


Octane is an http://en.wikipedia.org/wiki/Alkane" title="Alkane - alkane with the http://en.wikipedia.org/wiki/Chemical_formula" title="Chemical formula - chemical formula CH3(CH2)6CH3. It has 18 http://en.wikipedia.org/wiki/Isomer" title="Isomer - isomers .

One of the isomers, http://en.wikipedia.org/wiki/2%2C2%2C4-trimethylpentane" title="2,2,4-trimethylpentane - 2,2,4-trimethylpentane or isooctane, is of major importance, as it has been selected as the 100 point on the http://en.wikipedia.org/wiki/Octane_rating" title="Octane rating - octane rating scale, with http://en.wikipedia.org/wiki/Heptane" title="Heptane - n-heptane as the zero point. Octane ratings are ratings used to represent the anti- http://en.wikipedia.org/wiki/Engine_knocking" title="Engine knocking - knock performance of petroleum-based fuels (octane is less likely to prematurely combust under pressure than heptane), given as the http://en.wikipedia.org/wiki/Percentage" title="Percentage - percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane / n-heptane mixture that would have the same performance. It is an important constituent of http://en.wikipedia.org/wiki/Gasoline" title="Gasoline - gasoline .



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Posted By: SandMan
Date Posted: 16 July 2007 at 12:38pm
In simpler (and admittedly less complete) terms, higher octane causes the gasoline to combust in a much more even and predictable manner. As Enos touched on, this helps prevent piston "knock" and potential damage to the engine, especially in the case of performance cars.

Both my cars require Premium... And both get 18 MPG.

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