Octane Question
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3rd Gear
Joined: Mar 2005
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Octane Question
My wife has been driving my vette while her car is in the body shop after a parking lot accident. She filled the car up with 101 octane fuel thinking she was doing the right thing. Normally I use 93 octane fuel. My question is, will this harm the engine or converters or sensors in any way? I have a 05 Automatic with 10,000 miles. Thanks for any insight.
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Pro
Joined: Nov 2005
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Originally Posted by jabez
Thats a bargain. 100 octane is close to 7.00 here.
It won't hurt the car to run octane too high but it could hurt your pocket book. It will only richen the fuel mixture.
John
Intermediate
Joined: Mar 2006
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Shouldn't hurt anything as long as it has an additive package & you use it up in a reasonable time.
You can run more advance with high compression motors or supercharged motors with 100+ octane.
DoS
You can run more advance with high compression motors or supercharged motors with 100+ octane.
DoS
Last edited by DoSvdanye; Mar 31, 2006 at 09:46 AM.
Drifting
Joined: Jul 2005
Posts: 1,343
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From: CA
Originally Posted by DoSvdanye
Shouldn't hurt anything as long as it has an additive package & you use it up in a reasonable time.
High octane burns slower (at the same CR) than 93,2,1 on down.
That's why you can run more advance with high compression motors or supercharged motors with 100+ octane.
DoS
High octane burns slower (at the same CR) than 93,2,1 on down.
That's why you can run more advance with high compression motors or supercharged motors with 100+ octane.
DoS
I don't know where this burn slower nonsense came from, but would you guys that don't have the slightest idea what you're talking about quit infecting others with your misconceptions?
Le Mans Master
Joined: Sep 2000
Posts: 5,635
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From: Orlando Floriduh
Originally Posted by C6Swede
It will not hurt your engine at all. Instead it will run better since it´s less risk of setting back the ignitioncurve. I live in sweden and i run 99 octane all the time.
European octane rating is not the same as U.S. We use R+M/2. You guys use a single number. I don't remember which one though. European 99 is about the sam as 93 in the U.S.
Safety Car
Joined: Dec 2004
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From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
Originally Posted by Irv
Here we go again with the silly octane theories. Higher octane does not mean "slower burning". That is definitely not why you can use a higher compression ratio. Higher octane gasoline simply resists detonation from heat longer than lower octane gasoline. (Higher compression causes more heat in the mixture, because energy isn't lost but the volume decreases.) Other than a somewhat lower total BTU content per gallon (due to the octane enhancers) there's no other difference. It doesn't burn hotter either. Lower octane gasoline in a cylinder of the same compression ratio burns at about the same temperature. And the flame front from proper ignition (from the spark plug, and only the spark plug) moves at the same speed regardless of octane. (Really fast, but still it takes long enough that multiple spark plugs per cylinder can make a difference in high rpm motors.)
I don't know where this burn slower nonsense came from, but would you guys that don't have the slightest idea what you're talking about quit infecting others with your misconceptions?
I don't know where this burn slower nonsense came from, but would you guys that don't have the slightest idea what you're talking about quit infecting others with your misconceptions?
based upon your statement;
"Higher octane gasoline simply resists detonation from heat longer than lower octane gasoline."
detonation can also be known as preignition. preignition can be known as ignition before proper time.
with that in mind, it's easy to see how some can believe that higher octane fuels burn slower, even though that's not the case.
use of 100 octane won't hurt anything, however, it may be possible that the computer will tune for the 'new' fuel then detune for the 'normal' fuel. no problem and it will only be tuning timing as it relates to knock. higher octane equals lower knock potential. i hope you didn't make you wife feel too bad, i'm sure she didn't mean any harm and thought you would have been happy that she took the time to find good fuel.
Drifting
Joined: Jan 2005
Posts: 1,942
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From: Houston Tx
Originally Posted by Larry B.
European octane rating is not the same as U.S. We use R+M/2. You guys use a single number. I don't remember which one though. European 99 is about the sam as 93 in the U.S.
And by the way, other posts are also correct. While the higher number will do no harm (assuming of course that it's unleaded), it will also do no good. Don't waste your money. Once the knock sensor senses no knocks (and this happens at 91 octane), there is zero benefit to going higher. No harm, but no good. Money to go higher than 91 is thrown down the drain.
