Honda Civic Fuel, Oil, Cleaners & Other MaintenanceExtending the life of your Honda Civic requires the proper fuel, oil, and cleaners, along with other regularly scheduled maintenance. Keep your Honda Civic fuel and oil at the right levels to keep your Civic on the road longer.
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Yeah, like S2000man01 said, if carbureted. The problem with that is that the fuel is not aromatized properly in a carburetor (it's not spread out), specially because it has a wet manifold compared to a EFI car that has a dry manifold. So you get pockets of fuel with out air and pockets of air without fuel, this means you will pocket in areas that are very lean, hence they will cause detonation and blow the motor up eventually. Higher octane fuel can help in preventing this.
slightly offtopic. my F3 honda motorcycle is carbeurated. do you think i'd be better off putting premium in the tank because of this?
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slightly offtopic. my F3 honda motorcycle is carbeurated. do you think i'd be better off putting premium in the tank because of this?
lol... that's a good one. But standing back for a second, you could possibly get more power, but the better question is do you need more power?
Speaking more technically though, modern carburetors are extremely well jetted and (in your case) not flowing as much fuel as a car carb would, so atomization is far greater because the jets can have a greater pressure drop and thus a better nozzle design. So I would say you many see .1-.05 hp gain, but then you get into the same range as the amount of power you loose with a slower burn, thus canceling each other out more or less. My Honda CBR600F1 has almost 50k on it without any problems and I just run 89 (that's what the guy I bought it from said the dealer told him to put in it, and at the time I just didn't question it). So I guess just go with whatever the manual says, chance are it probably says in the manual if gains will be noticed by higher octane (my Accord manual says no performacne will be found using higher octane or something like that), I'm at work so I can't really look at the manual CBR manual, if I could even find it.
All I know is, I've run premium through 5 cars that I've had, including my current civic. (not boosted yet) Thats 3 japanese cars and 2 domestics and I've never had any failures of any kind with the fuel system. I can honestly say that compared to 87, the 93 octane that we have here in FL does make the engine run a little bit better atleast thats the way it seems to me dont try to school me on the octane rating either because I know what it means. I certainly dont think I've ever noticed any power loss.
Last edited by thiscrackerntam; 03-22-2005 at 06:24 PM.
unfortunately, science and the laws of physics disagree with you.
and how much mileage did you put on those cars? did you use only premium?
if you feel a throttle response better with premium, it's a placebo effect, because there isn't anything in the premium that isn't in the regular. the only variation you will get in gas is going from one BRAND to another.
on the same topic, I decided to put some shell gas (same octane) in my car instead of mobil. Wow I don't know why but the car ran like absolute crap. Switched back to mobil the next tank and back to normal.
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unfortunately, science and the laws of physics disagree with you.
and how much mileage did you put on those cars? did you use only premium?
if you feel a throttle response better with premium, it's a placebo effect, because there isn't anything in the premium that isn't in the regular. the only variation you will get in gas is going from one BRAND to another.
I'd like to know your explaination to this placebo effect.
no, I know what the definition is, but I want him to explain it further in detail why its a placebo effect. Sorry man, but I wont be there. I have to work.
Damn, im glad i read this. I have been puttin g93 since i took of lot. Idk its just when i run 93 i feel shifting is more smooth compared to 86. The manual says 86 or higher does it not? Thats why i put 93, bc it never actualy said no higher then 86. Oh and when boosted, where u get bigger fuel injectors for the d17a1, non vtec? Thanks.
stop thread jacking! I will delte all the topics not associated wit this thread.
I put in 87 shell tonite. see how it goes. the accord tracks my gas mileage history, so I will see if i get worse, better or indifferent.
Derek, I would put in a bottle of chevron techron with your next fill to help clean your engine, valves, injectors, etc. Then fill up and see what kind of mileage you get. You should go a couple tanks worth to really see the average. Make sure you use the same brand every time. Even same gas station if you can.
no, I know what the definition is, but I want him to explain it further in detail why its a placebo effect. Sorry man, but I wont be there. I have to work.
You and many other people suffer from this thought or feeling that their car is more responsive because of higher octane gas.
If you fill up with 87 octane at a station, and then get 93 at the same station same brand, you are not getting ANYTHING more in the gas except the higher octane rating which equals longer burn time which equals what I already told you above. The mixture doesn't have time to burn completely before being scavaged out of the chamber, therefore equating to a slight loss of power. This loss is not discernable enough that you can feel it for the most part, unless you put in 100+ octane.
And as I already stated, federal regulations/laws state that whatever addatives are in a brand of 87 octane gas must also be in equal and same amount in the 93 octane gas. So as I said, you're not getting any better cleaners or more addatives if you use the same brand.
So what you MIGHT be experiencing is 1 of 2 things. A change in weather, causing your ECU to re-adjust and offer a bit more throttle response. Or you are changing brands of gas to something that works better with your car.
The only other case would be is if your engine is knocking for some reason on 87 octane, and going to 91 fixes that. However, if you're knocking on 87 and your car is made for 87, switching to 91 should be a temp solution as something greater is happening to your car.
Whos thread jacking??? Anyway... S2000man01, you can say what you want, but you're not going to change my opinion. The problem is, I know what I know from personal experience and you have your facts gathered from the internet and what not, but I dont think your facts are significant enough to support what you're saying. If running premium in a car that calls for an octane rating of ATLEAST 86 or higher by the manufacture were an actual problem, it would say "do not use premium" in the owners manual but it doesnt. Atleast not for our vehicles it doesnt, and I'm willing to bet atleast 50% of the owners manuals for the econo boxes out on the road dont say it either.
Last edited by thiscrackerntam; 03-22-2005 at 11:08 PM.
Sorry man, but I wont be there. I have to work. 
Anyway... S2000man01, you can say what you want, but you're not going to change my opinion. The problem is, I know what I know from personal experience and you have your facts gathered from the internet and what not, but I dont think your facts are significant enough to support what you're saying. If running premium in a car that calls for an octane rating of ATLEAST 86 or higher by the manufacture were an actual problem, it would say "do not use premium" in the owners manual but it doesnt. Atleast not for our vehicles it doesnt, and I'm willing to bet atleast 50% of the owners manuals for the econo boxes out on the road dont say it either. 
