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Gas Octane
- Burn Rate
started by metalgear32z
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April 4th 2008 at 1:36 PM
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metalgear32z
Junior Member
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201 Posts 
Group: Members
Member Since: November 10th 2006
Location: Johnstown, NY, USA
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SO i pulled up to the Gas Station the other day to fill my car up with gas and they said they were all out of regular, but the gas attendant told me if i wanted i could get premium gas even know its more expensive it will burn slower, so ill save on the long run. Ive always thought 92 burned faster than 87. And 87 burns cooler than 92, what is the real truth? One things is probably true 92 is probably better for your car right?
Chad
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April 4th 2008 at 1:51 PM
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98700xc
I Can Smell It Now!!!!
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680 Posts 
Group: Members
Member Since: January 7th 2005
Location: Roseville, Mi, USA
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The higher the octane number the cooler it burns, as far as one burning slower than the other I have no clue if there is any truth to that.
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April 4th 2008 at 2:41 PM
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thewayout440
777
thewayout440 mmmmpow.
Updated Last Monday at 7:17 AM
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3162 Posts 
Group: Members
Member Since: June 3rd 2006
Location: chittenango, ny, USA
Current Sled: 2005 iq r 440
2008-2009 Miles: 1250 ish
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^^thats exactly how ive always understood it
TEAM 50 CAL.
2005 iqr 440 stock:(
prox 440 chassis water xer in the making 600 big block motor other odds and ends
2003 prox 600 ( SOLD )
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-xcr440
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April 4th 2008 at 2:44 PM
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Sledneck26
SnoWhore
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1659 Posts 
Group: Members
Member Since: July 6th 2007
Location: Mountain Land, B.C., Canada
Current Sled: 2007 Summit X 800R
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the higher the octane the less prone it is to exploding under pressure and heat. you use a higher octane in a high comp engine for the fuel doesnt detonate.
2007 Summit X 800R 151"
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April 4th 2008 at 3:37 PM
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G-Man
I'm a new DADDY!!!
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999 Posts
Group: Members
Member Since: November 21st 2005
Location: Kugluktuk, Nunavut, Canada
Current Sled: 2006 Trail RMK 700
2008-2009 Miles: 820
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The higer the octane the slower it burns. It is a very miniscule change but a change non the less. On my 03 Polaris 700 there is a timing switch on my key that advances the timing a bit for premium fuel. It does this so that the main explosion of power is just after Top Dead Center, if you do not advance the timing with premium fuel then the explosion will happen later and the piston won't get the brunt of the fuel and effectively loose power. But again some engines run better on the 87 instead of 91-92 by design. That is why you always here people say that you gain nothing by adding race fuel to a motor not desinged to run race fuel.
Life's Short Ride Hard!
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April 4th 2008 at 4:08 PM
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you have to understand how much heat that the fuel absorbs out of the engine. along with burn rates. the higher the octane the more heat it can obsorb and the more heat it takes to ignite. that is why you have preignition with a low octane fuel, or octane knock. your timing system is sparking at any where around 20+ degrees of crank rotation before top dead center when the piston starts moving down. this 20 degrees is figured on fuel octane and flame rate. if you are timed for 92 and run 87 the fire is ignited early, but since 87 ignites at a lower temp and burns faster, it has absorbed enough heat from the engine so that when the spark ignites it, the flame burns faster than the piston rises, so you get that knock sound, its from trying to compress an explosion. it is the piston rattleing in the bore. to much of that and you can break a skirt or blow the top off a piston.
nothing goes like 3 holes!!
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