89 octane = reduced mpg
#32
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Originally Posted by JohnH
If you are a chemical engineer, you should know how to spell tribologist. And I seriously doubt that you, or the tribologists you allege to know, know more than the Engineers employed by Honda Corporation.
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Originally Posted by Sick Cycle
well ... just some food for thought.
D17a2's recommend octane is 87. Compression ratio is 9.9:1
B16a2's recommended octane is 91. Compression ratio is 10.1:1 (iirc)
D17a2's recommend octane is 87. Compression ratio is 9.9:1
B16a2's recommended octane is 91. Compression ratio is 10.1:1 (iirc)
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Originally Posted by Jrfish007
True, but in the case of the B16, the compression ratio is not the reason for high octane, the higher RPM's are. Remember the ONLY reason for higher octane is to prevent pre-ignition. There are many way to cause preignition, one is high compression another is high RPM.
that's what has always baffled me about the 91 octane b16 and the 87 octane d17 arguments (mainly in my head).
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Originally Posted by Jrfish007
I'm a chemical engineer, I know more about gas and oil than they do And FP60 and LC20 is one of the few additives that topologists actually recommends.
BTW, the second part of my statement wasn't directed toward you, but rather everybody saying that 93 octane is better.
BTW, the second part of my statement wasn't directed toward you, but rather everybody saying that 93 octane is better.
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Rep Power: 238 From what I understand, and that's not much, is....higher octane gas(93) does not mean cleaner, all it means is that it has more hydrocarbons, which is designed for a higher compression engine to ignite the fuel. I'm assuming that any byproduct of burning this fuel would be the same as 87 octane since the octane rating has nothing to do with the purity of the fuel. So by a reasonable assumption i would dare to say that you could actually damage your d17 by putting fuel in it that "burns colder" than the fuel the engine was originally designed for. Don't take it from me, go visit http://howstuffworks.com and see for yourself. Ignorance sucks, so once you become educated on the subject you will realize how much money you can actually save just by understanding the physics of this stuff. Also it makes you look smarter when you talk to other people .
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Originally Posted by shroomster
curse you for saying higher priced gas is better....I'ma go broke lol.....I'ma stick to the fp60+87 though....
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Originally Posted by shroomster
.....I'ma stick to the fp60+87 though....
Originally Posted by Gearbox
87+fp60 = happy civic
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Originally Posted by shroomster
that's two hehe
Me too...Actually I say FP60 + 87 = happy F150 and '06 civic
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Rep Power: 0 heh. gas has to be sitting around for QUITE a while for it to turn stale, iirc.
you think 89 is stale? ... how about the pump 100 octane that I use. not too many people need/use that.
you think 89 is stale? ... how about the pump 100 octane that I use. not too many people need/use that.
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Originally Posted by Sick Cycle
heh. gas has to be sitting around for QUITE a while for it to turn stale, iirc.
you think 89 is stale? ... how about the pump 100 octane that I use. not too many people need/use that.
you think 89 is stale? ... how about the pump 100 octane that I use. not too many people need/use that.
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Originally Posted by Sick Cycle
^ and I bet it was cheaper than $7/gallon
yeah, that was about 4-5 years ago, I paid something like $5 a gallon. But normal gas was like $1.25, so it wasn't that much
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Originally Posted by Blackpearl
Airplane fuel?
Simliar.... normal Aviation fuel is 100 octane leaded. This was 104 octane leaded, probably came from the same refinery over in England. Now they have 105 octane unleaded, because it's hard to sell leaded fuel. But aviation fuel is actually pretty cheap, for 100 octane leaded it's about $2.50-$2.75 right now. I have been thinking of getting I know a few pilots and a guy that runs an airport
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Rep Power: 0 Octane rating has NOTHING to do with fuel mileage... Mileage all depends on the condition of the fuel system and over all vehicle condition. And mainly it depends on throttle position and city or hwy driving.
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Rep Power: 0 Simliar.... normal Aviation fuel is 100 octane leaded. This was 104 octane leaded, probably came from the same refinery over in England. Now they have 105 octane unleaded, because it's hard to sell leaded fuel. But aviation fuel is actually pretty cheap, for 100 octane leaded it's about $2.50-$2.75 right now. I have been thinking of getting I know a few pilots and a guy that runs an airport
Leaded fuel will fukk up a regular car. It willl fukk up valves, pistons, and mess up the cat....
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Rep Power: 0 Leaded fuel will not mess up your valves and pistons. It will destroy your catalytic converter and O2 sensors, basically coating them in lead. Octane can have a slight effect on mileage. You'll get your best power and mileage with the lowest octane you can run without getting pre-ignition or detonation.
Up in this high altitude (Denver, CO), I run 85 in my Civic. I get less oxygen up here (approx. 22 - 24% less compared to sea level), so I do not need as high octane as car in lower alititude.
Not only is octane rated in how much it can be compressed before igniting, but it is more of what the flash point is. Compression causes heat (expansion cools) which will cause the air:fuel mixture to ignite. Not only do you need higher octane on higher compression engines, but boosted and hotter running engines (which is also affected by load) need it too. As for a NA Civic, buy low grade and be happy. I ran 85 octane on my stock SHO all the time and it ran great at nearly the same compression as the Civic and it was run MUCH harder.
Up in this high altitude (Denver, CO), I run 85 in my Civic. I get less oxygen up here (approx. 22 - 24% less compared to sea level), so I do not need as high octane as car in lower alititude.
Not only is octane rated in how much it can be compressed before igniting, but it is more of what the flash point is. Compression causes heat (expansion cools) which will cause the air:fuel mixture to ignite. Not only do you need higher octane on higher compression engines, but boosted and hotter running engines (which is also affected by load) need it too. As for a NA Civic, buy low grade and be happy. I ran 85 octane on my stock SHO all the time and it ran great at nearly the same compression as the Civic and it was run MUCH harder.
Last edited by yamahaSHO; 10-27-2006 at 10:28 AM.
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Rep Power: 0 good to know yamahaSHO. I was getting confused since the Honda Manual says my 01 civic should use 86 octane, but the local stations here only sell 85 and 87. I had a feeling the higher altitude had something to do with it, but wasn't sure.
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Rep Power: 356 actually its not that suprising that people think higher octane = better gas. Considering the names marketing has given to their grades of gas...
"Regular", "Plus" and "Premium"....
Based on that what would be implied to be the "best" gas? and which one does the gas company want you to buy?
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Rep Power: 0 I use 91. It runs a bit better and it still does not cost too much. But I do live in cali very low alti and our gas sucks. I use shell v-power and felt it is the best. I know it is prolly overkill but I do not care. One of my other cars is 91 or better so I am used to it.
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Rep Power: 261 I use the lowest here, 87, always have and always will unless I get boosted. Other than that there's no point to spend the extra money, other than waisting money since Honda tuned our cars to run best off of it.
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Rep Power: 239 idk if this was listed but the higher the octane the harder it is to burn the fuel.. aka 93 octane takes a lot more compression to burn molecules as compared to 89 or 87. Hence the reason for Diesel which is running at a crisp avg of 18:1 or 23:1 compression. So the point in putting in 89 is just going to waste your money . and you can actually do damage sometimes if you run too high of an octane that is not needed for your engine.
I was thinking about goin with 89 for the winter because the gas is more oxygenated so im gonna lose MPG and small amounts of power that i wont notice.
I was thinking about goin with 89 for the winter because the gas is more oxygenated so im gonna lose MPG and small amounts of power that i wont notice.