octane rating
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octane rating - 10/22/2004 4:56:05 PM
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RTmotive
Posts: 71
Joined: 10/9/2004
Status: offline
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hey guys. i got my owner's manual in the mail today(i just bought my bike). i noticed it recommends anything above 86 octane. i thought most crotch rockets needed 93, am i wrong? should i go ahead and start putting 87 or 89 in it? sorry if this question seems elementary, but it surprised me that it only needs 86 or higher. thanks in advance! oh, and it's a 600rr.
< Message edited by RTmotive -- 10/22/2004 5:08:55 PM >
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RE: octane rating - 10/22/2004 5:41:40 PM
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sirlimpzalot
Posts: 1404
Joined: 8/24/2004
From: Roseville, CA
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That is true..the motor doesn't require more than standard grade fuel..but most people run the higher grade just because they can and the difference is probally .80 cents per fill up. Some motors require higher octane, but obviously that one doesn't..
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RE: octane rating - 10/23/2004 11:51:20 AM
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RTmotive
Posts: 71
Joined: 10/9/2004
Status: offline
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ok cool, i think i'll keep putting 93 in until it cools down here in FL. i figure the higher grade fuel will have a better resistance against pinging in the high heat. but once it begins to cool down i'll step down the octane. thanks a lot for your help, limpz.
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RE: octane rating - 10/25/2004 1:02:11 PM
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Duke
Posts: 73
Joined: 10/12/2004
Status: offline
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RT - my dealer actually suggested that I don't put the high octane in my bike.
they said it only calls for the lower octane and will not like the lower octane if you run high octane in it too often. once in a while is alright to clean things up.
_____________________________
2001 - CBR600F4i
Black & Red
Box Stock
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RE: octane rating - 10/26/2004 10:35:51 PM
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RTmotive
Posts: 71
Joined: 10/9/2004
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ok, thanks man. guess i'll step it down on the next fill up.
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RE: octane rating - 11/11/2004 12:02:03 PM
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Duke
Posts: 73
Joined: 10/12/2004
Status: offline
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quote:
ORIGINAL: Baldman
quote:
ORIGINAL: Duke
RT - my dealer actually suggested that I don't put the high octane in my bike.
they said it only calls for the lower octane and will not like the lower octane if you run high octane in it too often. once in a while is alright to clean things up.
Your bike does not modify the ECU according to the fuel type/octane you use.
Rule of thumb is: If you have not rejetted your carbs, installed a full exhaust system, installed a Power Commander, or modified the air intake/exhaust in any way - It is a waste of money to purchase anything other than Regular/87 fuel.
I have to use Premium/93+ in my bike because I have modified it so much. If I am in a pinch and Premium is not available (in the sticks) then I can get by on Regular, but she does not like it. Pinging would not be an issue for me (since my timing has not been altered), just a loss of power due to incomplete combustion.
i didn't say anything about modifying the ECU.
i think your "rule of thumb" may be a bit whacked. 
if the bike is supposed to run 93 octane, you should run 93 octane. same goes for cages, a lot of VW's for example.
_____________________________
2001 - CBR600F4i
Black & Red
Box Stock
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RE: octane rating - 11/11/2004 3:45:23 PM
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Duke
Posts: 73
Joined: 10/12/2004
Status: offline
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Point taken Baldman. I was using the cages as an example.
I'm not sure if you are a really sarcastic person or not, as it is impossible to tell over the internet. But I just wanted to point out that most of your posts come across to me as being very in your face. I am in agreeance about adding humour to this forum, but balls out trying to make people feel stupid is not necessary.
Cheers.
_____________________________
2001 - CBR600F4i
Black & Red
Box Stock
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RE: octane rating - 11/11/2004 5:43:47 PM
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chainstretcher
Posts: 4150
Joined: 11/5/2004
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Wow -- it's hard to pick a more controversial subject. I don't know of anyone who's blown an engine using higher than recommended octane. My bike calls for 91 or better (1kRR).
Now I don't even claim to be an expert on octane but there are a couple of things I've picked up along the way. First is there are at least 3 different ways of measuring octane. Usually at the pump it's R+M/2 . R=research method. M= I dunno.
Second, and I actually do know this due to turbo issues, octane is simply a number placed on a fuel's ability to resist detonation. Detonation is when your fuel ignites before the spark. To say this is a bad thing is an understatement. Less than 2 seconds of detonation at high rpms can cause bent rods, dropped valves, holed pistons and generally a real crappy day. The only reason you'd need to run higher than recommended octane is if you've raised your compression. Shaved heads, turbo or NOS are a few examples.
Running higher octane in a 9:1 engine (93 as opposed to 87) will not increase horsepower. It will slightly decrease horsepower because the 93 resists burning more than the 87 therefore if you're not combusting at 100% efficiency some of the 93 will be unburned yielding less horsepower. It's not a lot less horsepower, but it is less.
And RE: Baldman -- his sarcastic tendencies are starting to grow on me. Plus he's in Jawja like me so he can't be that bad. ha ha. Since the written word does not convey body language or tone I'll just tell you dudes what I tell the wifey: If I say something that can be interpreted 2 ways and one of them is bad ... I meant the other one.
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