Advanced question on Switching octanes - 600RR.net
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post #1 of 14 (permalink) Old 06-23-2008, 06:33 PM Thread Starter
 
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Advanced question on Switching octanes

So ive been running 87 in my 04 CBR600rr lately and i havent been revving above 7500 rpm. Tonight im going on a canyon run and will be revving quite high in low gears.

Im about to fill up my tank afterwork cuz im on my last bar.

Anyways, if i switch up to 91 and use that while im revving high, will that be ok for the engine, even though ive been running 87 lately?

I would like to use 87, but i dont want my engine to explode while im revving above 7500 or even 9000 rpms.

Any advice will be greatly appreciated
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post #2 of 14 (permalink) Old 06-23-2008, 07:34 PM
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Just use what's recommended for your bike, should be listed in your manual. High revs has nothing to do with octane. Regardless if you keep it under 5k or above 10k the compression will still be the same. FYI compression is the reason for octane. If the engine runs a high compression, a lower octane fuel will predetonate hence the need the for high octance.
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post #3 of 14 (permalink) Old 06-23-2008, 07:41 PM
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Using 91 wont hurt anything in the engine. Switching up octanes wont hurt your engine, except performance wise if the engine doesn't have enough compression, but 91 octane will be fine.
 
post #4 of 14 (permalink) Old 06-23-2008, 08:25 PM Thread Starter
 
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Well i guess what im trying to ask here is if i want to rev high with 87, will that be ok? The manual states 87 but everyone claims on their life that the bike needs 91 to rev high.
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post #5 of 14 (permalink) Old 06-23-2008, 08:30 PM Thread Starter
 
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Well i guess what im trying to ask here is if i want to rev high with 87, will that be ok? The manual states 87 but everyone claims on their life that the bike needs 91 to rev high.
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post #6 of 14 (permalink) Old 06-23-2008, 08:49 PM
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read the octane thread buddy.. just search for octane.. sooo easy, then just read

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post #7 of 14 (permalink) Old 06-23-2008, 08:50 PM
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You can rev it all the way to the limiter and it will be fine. The '07-08's "need" higher octane because they have a higher compression ratio, but the older models are recommended on the lower octane. Either way, 87 or 91 octane, it will be perfectly fine. you don't need 91 to rev high; I've hit the rev limiter many times running 87.
post #8 of 14 (permalink) Old 06-23-2008, 08:51 PM Thread Starter
 
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Thanks Demented, i guess i just need that reassurance that others run 87 and rev high. :)
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post #9 of 14 (permalink) Old 06-23-2008, 10:28 PM
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FYI, this is in no way an advanced question.
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post #10 of 14 (permalink) Old 06-24-2008, 03:58 PM
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Quote:
Originally Posted by spinbreakz View Post
So ive been running 87 in my 04 CBR600rr lately and i havent been revving above 7500 rpm. Tonight im going on a canyon run and will be revving quite high in low gears.

Im about to fill up my tank afterwork cuz im on my last bar.

Anyways, if i switch up to 91 and use that while im revving high, will that be ok for the engine, even though ive been running 87 lately?

I would like to use 87, but i dont want my engine to explode while im revving above 7500 or even 9000 rpms.

Any advice will be greatly appreciated
hahahahaha

when i'm on the track, i have always used 87. you're not going to blow anything up any time soon...

and for what it's worth... it's not JUST about compression ratio. it's a combination of compression and displacement. the more molecules you compress, the hotter it will get, thus the high octane you will need.

this is why a 10:1 automotive engine might need 89 or 91, and a 10:1 600cc engine only need 87. one is making 125cc's of air and fuel rub together, the other is making 700cc's of air and fuel rub together.

Last edited by Knightslugger; 06-24-2008 at 04:03 PM.
post #11 of 14 (permalink) Old 06-27-2008, 06:08 PM
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Quote:
Originally Posted by spinbreakz View Post
Well i guess what im trying to ask here is if i want to rev high with 87, will that be ok? The manual states 87 but everyone claims on their life that the bike needs 91 to rev high.
You can do what your manual says. I rev it all the way to the redline like "Demented" said.
I did it on diffrent bikes for many years, my engine never exploded.
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post #12 of 14 (permalink) Old 06-27-2008, 10:47 PM
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Uh are you telling me that I buy 93 for my bike ( its a 2008) for nothing?

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post #13 of 14 (permalink) Old 06-27-2008, 10:59 PM
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Uh are you telling me that I buy 93 for my bike ( its a 2008) for nothing?
usually what you get regardless... a whole lot of nothing. but hey, if it pings and the ecu retards the timing... go find a bottle of octane booster and dump an ounce in. next time get one grade higher. it's all designed to be up to the end user. if they are experiencing pre-detonation, and this goes for any automobile regardless of what the owners manual says, you need to put in a higher test gas. you don't know until you try. look at it this way... you'll get more power out of your bike if it doesn't and you end up using 87.
post #14 of 14 (permalink) Old 06-28-2008, 01:27 AM
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Originally Posted by Knightslugger View Post
usually what you get regardless... a whole lot of nothing. but hey, if it pings and the ecu retards the timing... go find a bottle of octane booster and dump an ounce in. next time get one grade higher. it's all designed to be up to the end user. if they are experiencing pre-detonation, and this goes for any automobile regardless of what the owners manual says, you need to put in a higher test gas. you don't know until you try. look at it this way... you'll get more power out of your bike if it doesn't and you end up using 87.

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