% of octane in gas
Jan 4, 2005 | 06:49 PM
#1
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% of octane in gas
alright i was learning about gasoline in science today and he said that 87 octane has 87% octane and 13% hepotane, which equils 100%. so i asked him how you can have 110 octane and he wouldnt answer me so he told me he wasnt sure and that if i found out i would get extra credit. so how is it made? i heard maybe they put lead in it?
Jan 4, 2005 | 07:29 PM
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% of octane in gas
OK Jordan, ask your science teacher what he's been smoking.
First, true octane is a straight chain of hydrocarbon consisting of 8 carbon atoms. Bet he doesnt know that off the top of his head.
Second, octane in a fuel sense is only a rating describing the anti-knock properties of a fuel. The fuel companies use an engine to determine the octane of a fuel. They run the motor under a load (hence the term motor octane), and also run the engine under a free running condition,no load (hence the term research octane). Most of the the time the rating you see on the gas pump is the M+R/2. They take the motor and research octane numbers, add them together, then divide by 2.
So................. tell him that simply the higher the octane the fuel rating is the more resistant to detonation (pinging or knock) it is.
Hope this will get his goat and make you look smarter,Bubba
First, true octane is a straight chain of hydrocarbon consisting of 8 carbon atoms. Bet he doesnt know that off the top of his head.
Second, octane in a fuel sense is only a rating describing the anti-knock properties of a fuel. The fuel companies use an engine to determine the octane of a fuel. They run the motor under a load (hence the term motor octane), and also run the engine under a free running condition,no load (hence the term research octane). Most of the the time the rating you see on the gas pump is the M+R/2. They take the motor and research octane numbers, add them together, then divide by 2.
So................. tell him that simply the higher the octane the fuel rating is the more resistant to detonation (pinging or knock) it is.
Hope this will get his goat and make you look smarter,Bubba
Jan 4, 2005 | 07:41 PM
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% of octane in gas
Originally posted by: Bubba297
OK Jordan, ask your science teacher what he's been smoking.
First, true octane is a straight chain of hydrocarbon consisting of 8 carbon atoms. Bet he doesnt know that off the top of his head.
Second, octane in a fuel sense is only a rating describing the anti-knock properties of a fuel. The fuel companies use an engine to determine the octane of a fuel. They run the motor under a load (hence the term motor octane), and also run the engine under a free running condition,no load (hence the term research octane). Most of the the time the rating you see on the gas pump is the M+R/2. They take the motor and research octane numbers, add them together, then divide by 2.
So................. tell him that simply the higher the octane the fuel rating is the more resistant to detonation (pinging or knock) it is.
Hope this will get his goat and make you look smarter,Bubba
OK Jordan, ask your science teacher what he's been smoking.
First, true octane is a straight chain of hydrocarbon consisting of 8 carbon atoms. Bet he doesnt know that off the top of his head.
Second, octane in a fuel sense is only a rating describing the anti-knock properties of a fuel. The fuel companies use an engine to determine the octane of a fuel. They run the motor under a load (hence the term motor octane), and also run the engine under a free running condition,no load (hence the term research octane). Most of the the time the rating you see on the gas pump is the M+R/2. They take the motor and research octane numbers, add them together, then divide by 2.
So................. tell him that simply the higher the octane the fuel rating is the more resistant to detonation (pinging or knock) it is.
Hope this will get his goat and make you look smarter,Bubba
well actually it said this in a modern marvels movie that we watched so he didnt actually say it, but he did agree with it. ill run this across him and see what he says.
Jan 4, 2005 | 07:48 PM
#7
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% of octane in gas
okay so thers 87% octane in 87 octane gas and 13%hepotane. so how much octane is there in 110 octane gas? or are you saying the 87% and 13% is a bunch of bull?, sorry im not really catching on.
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Jan 4, 2005 | 07:53 PM
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% of octane in gas
alright never mind i read that link above and it told me everything i wanted to.
this is what it said
HOW DO THEY GET OCTANE NUMBERS ABOVE 100?
Often it's done by pure extrapolation. A more reliable method, however, is through the use of so-called performance numbers. Briefly, these are arrived at by determining the instantaneous mean effective cylinder pressure (IMEP), using the fuel under test, at the highest boost that does not cause knocking. This number is then multiplied by 100 and the resultant is divided by the IMEP at the highest boost that does not cause knocking on the 100 octane equivalent fuel.
Note that, technically, there is no such thing as an octane number above 100. Avoid referring to "110 octane gasoline". Rather "a gasoline with a performance number of 110" is more accurate.
this is what it said
HOW DO THEY GET OCTANE NUMBERS ABOVE 100?
Often it's done by pure extrapolation. A more reliable method, however, is through the use of so-called performance numbers. Briefly, these are arrived at by determining the instantaneous mean effective cylinder pressure (IMEP), using the fuel under test, at the highest boost that does not cause knocking. This number is then multiplied by 100 and the resultant is divided by the IMEP at the highest boost that does not cause knocking on the 100 octane equivalent fuel.
Note that, technically, there is no such thing as an octane number above 100. Avoid referring to "110 octane gasoline". Rather "a gasoline with a performance number of 110" is more accurate.
