Fuel octane (Full Version)

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Fuel octane

zerochickenstrips -> Fuel octane (9/10/2006 4:43:06 PM)
In attempt to dispell all rumors, misunderstandings, conjectures, etc. about the different fuel octane ratings and what they mean and what should be used in your bike, please click on this link and read fully what it has to say. I found it to be very enlightening and I hope that you find the same true. And by the way, octane boosters are a huge waste of money. Thank you.

hondadriver4life -> RE: Fuel octane (9/11/2006 1:44:43 AM)
so they are basically saying that it is ok to use regular low grade octane gas in our bikes?????????? call me skeptical because i dont feel like blowing my motor but i some how find that hard to believe even with the dyno chart.......

BrianAZ -> RE: Fuel octane (9/11/2006 10:01:12 AM)
"low grade" Octane rated gas isn't a bad thing. The only thing an Octane rating does, is specify how much the air/fuel mixture can be compressed without detonating. If your bike does not exhibit the knocking sounds, then you are not experiencing early combustion and you will get the most amount of fuel burned. If you use a higher Octane rated gas, you are leaving more unburned fuel, preventing you from reaching peak HP and fuel economy.

knischewsky -> RE: Fuel octane (9/12/2006 7:54:28 PM)
from the factory, my 1997 cbr 600f3 calls for at least 91 octane, there has to be a reason for this, and what about bmw's and those fancy cars, they use high octane?

DThompson -> RE: Fuel octane (9/12/2006 8:03:07 PM)
From the factory the 99-2003 F4 and F4i bikes call for 86 octane. I dont think your 97 F3 calls for 91 octane, I owned the same bike and I had no problems with it running 86 octane. Infact, I am pretty sure I read inside my manual that came with the bike that it calls for 86 octane as well. Those BMW's and SuperCars have a high compression. Thats why they call for the higher octane gas. This is what manual I am reading this info from. [image]local://upfiles/4569/4CDA678B9A794ED7B85E6E2375B61A7B.jpg[/image]

spdrmns -> RE: Fuel octane (9/12/2006 8:52:09 PM)
ok, first off from the other thread on this topic i said that it runs best on 91 octane because of the high compression on the newer bikes... (12.0: 1) sombody told me thats not true...... even thoe i just sat on a 2005 R6 at the dealer like a week ago and it said -PREMIUM FUEL ONLY- right on the tank..... To whome it may concern, The yamaha R6 has about the same compression ratio (12.4:1) as my F4i (12.0:1) making my bike also require 91 just like the R6 because of the compression. once again, the lower octane fuel will detenate before it gets to top dead center... so basically if you have 12.0:1 or higher run on premium. 10:1 or higher run on middle, 8:1 or higher on 87... so find out your compression on your f3! and if its 12.0:1 or higher then put premium!

spdrmns -> RE: Fuel octane (9/12/2006 8:54:24 PM)
oh and get the actual HONDA SERVICE MANUAL! its seriously way better then then clymer and all the other ones... [image]local://upfiles/9828/C0080C9426BF4345BA3892FF440C9326.jpg[/image]

gromay -> RE: Fuel octane (9/12/2006 9:08:13 PM)
50%yes-50%no, someone is lying!? help!! I bought a 91 cbr f2 (with no owners manual) a have asked and read and only got more confused, some people say I should use 87, because of the low compression of my older bike, that higher octane will only rob me power and many reasons more explained very well . It seams like I have heard the exact same amount but opposite and that I should use higher octane because of the higher compression on motorcycles, also explained with details. Its ridiculous!! Some say 87, some say 91 and some say 93! and everyone assures it, I know that half of them are laying and don’t know what they are talking about. But who? some say the owners manual call for 87 and some say it calls for 91, come on! Dose anyone realy know what the owners manual say?? dose anyone have the manual with them? but please don’t reply if you are not certain Help!! what should I use on my f2? why?? thanks!

DThompson -> RE: Fuel octane (9/13/2006 12:19:12 AM)
quote: ORIGINAL: spdrmns ok, first off from the other thread on this topic i said that it runs best on 91 octane because of the high compression on the newer bikes... (12.0: 1) sombody told me thats not true...... even thoe i just sat on a 2005 R6 at the dealer like a week ago and it said -PREMIUM FUEL ONLY- right on the tank..... To whome it may concern, The yamaha R6 has about the same compression ratio (12.4:1) as my F4i (12.0:1) making my bike also require 91 just like the R6 because of the compression. once again, the lower octane fuel will detenate before it gets to top dead center... so basically if you have 12.0:1 or higher run on premium. 10:1 or higher run on middle, 8:1 or higher on 87... so find out your compression on your f3! and if its 12.0:1 or higher then put premium! Are you just pullin this out of your ass or what man??? Would you like me to scan and paste the picture of the page onto the forum. It says plain as day that it takes 86 octane fuel for US models and 91 for UK models. I told you this before. Anyone else want me to take a picture of the page and post it on the website???? As for the service manual. I have been Using Haynes and Chilton repair and service manuals for years. They do just fine. And you are talking about a Yamaha again.

spdrmns -> RE: Fuel octane (9/13/2006 12:57:33 AM)
quote: quote: ORIGINAL: spdrmns ok, first off from the other thread on this topic i said that it runs best on 91 octane because of the high compression on the newer bikes... (12.0: 1) sombody told me thats not true...... even thoe i just sat on a 2005 R6 at the dealer like a week ago and it said -PREMIUM FUEL ONLY- right on the tank..... To whome it may concern, The yamaha R6 has about the same compression ratio (12.4:1) as my F4i (12.0:1) making my bike also require 91 just like the R6 because of the compression. once again, the lower octane fuel will detenate before it gets to top dead center... so basically if you have 12.0:1 or higher run on premium. 10:1 or higher run on middle, 8:1 or higher on 87... so find out your compression on your f3! and if its 12.0:1 or higher then put premium! Are you just pullin this out of your ass or what man??? Would you like me to scan and paste the picture of the page onto the forum. It says plain as day that it takes 86 octane fuel for US models and 91 for UK models. I told you this before. Anyone else want me to take a picture of the page and post it on the website???? As for the service manual. I have been Using Haynes and Chilton repair and service manuals for years. They do just fine. And you are talking about a Yamaha again. so basically what you are saying is that there is NO POINT FOR PREMIUM FUEL?!?!?!?!??! THEY MAKE IT FOR A REASON!!!! HIGH COMPRESSION ENGINES!!!! have you ever actually took your bike on a dyno??? have you actually read WHY people use premium gas???? and NO I AM NOT PULLING THIS OUT OF MY ASS!! i am saying this from experiance on the dyno!! SO, actaully read up on it and learn instead of just copien a page from a book! I dont give a flien shit what your book says! i have re-built and repaired more bikes then you have proly ridin! oh and i guess if you build up a stroked F4i motor you would use 87 JUST LIKE THE PROS!! HA! As for you gormay, find out what your compression ratio is.... and go off what i said before... i tried to be nice before but it obviosly it didnt get my point across....

spdrmns -> RE: Fuel octane (9/13/2006 1:01:21 AM)
the yamaha R6 motor is VERY simalar to the F4i motor! VERY!

canadianF4i -> RE: Fuel octane (9/13/2006 8:10:05 AM)
I'm not going to bother trying to prove to you that you should be using premium fuel in any modern high compression bike or car because this topic has been beat to death. [sm=chairshot.gif] But know this; if the octane you use is too low it will harm your engine but if it's higher then needed it won't. So does it not sense that if you are unsure of what octane you put in that you should buy premium fuel to be safe. For crying out loud it's only gonna cost you literally a couple of bucks more per tank in a bike. Don't be so f**king cheap![sm=icon_flaming.gif]

spdrmns -> RE: Fuel octane (9/13/2006 10:59:48 AM)
quote: I'm not going to bother trying to prove to you that you should be using premium fuel in any modern high compression bike or car because this topic has been beat to death. But know this; if the octane you use is too low it will harm your engine but if it's higher then needed it won't. So does it not sense that if you are unsure of what octane you put in that you should buy premium fuel to be safe. For crying out loud it's only gonna cost you literally a couple of bucks more per tank in a bike. Don't be so f**king cheap! +1!!!!!!!!

DThompson -> RE: Fuel octane (9/13/2006 1:40:26 PM)
Any automotive expert will tell you running a higher octane than the rated value is a waste of money. Your bike will not run better nor get better gas mileage. It isnt a question about being cheap. If your bike is designed for using regular gas and not premium than that is what you should use. Yes using to low octane will cause the gas to ignite to early but using to high will not give you better gas mileage or a power increase. If your bike is designed for using 87 octane gas than you should use that gas nothing lower and nothing higher. To low and you will be losing power because it will burn to early To high and you will be losing power because it wont completely burn. Hence dont be an idiot and argue about this. The manual for the bike says to use 86 for all 99-2003 Honda 600cc bikes. So use that. And incase you dont have 86 than use 87 because its the closest. I am not telling you to use 86-87 octane in everything. I am saying that most bikes arent designed for best use with higher octane gas. As for the other bikes. If it claims to use a certain grade in the manual than use what it says. Oh. and as for what the manual says, They print those for a certain reason so you dont have to figure out what things are good and bad for your cars but if you want to figure it out for yourself than be my guest and throw that little book away.

tcjayde -> RE: Fuel octane (9/13/2006 2:16:38 PM)
I love it how someone gets on here to ask a simple question, and you guys blow it up into a GIANT war. Personally, I believe those books (a.k.a. manuals) are made for a reason. You cannot tell me that you have not consulted it at one time or another about something you wanted to know about your bike (or vehicle). And, in the event you don't consult your manual, you probably ask someone or research it online. But, the funny thing is, the people you talk to in person or on the internet probably got that information from the manual that you deemed worthless. I like to use this website as a tool for learning. You idiots like to use it as ammunition against each other. So, octane seems to be an argument here. I know I would personally use what is stated in the numerous manuals that have been cited here. Last time I checked, high compression engines were built engines used in drag racing, etc. But, hey, if you either 1) have built your engine for high performance or 2) won't suck it up and admit you are wrong, then go ahead and use whatever fuel you feel is necessary for your bike (or vehicle). I know you may think I am an idiot girl who has no idea what I am talking about. But, let's just say... you don't know me. So, I may know alot more than you think. [:D] *EDIT* Also, wasn't a website cited here about octanes? It's funny that you guys get on here and ask for pointers and help on certain subjects. When... this website is no different than the one mentioned above. You believe some of the shit you read on here. Why wouldn't you believe statistics on another website?

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