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Old 04-13-2012, 10:57 AM   #1
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Is 93 Octane better to use?

I normally just use 93 octane when I fill up my bike cuz I thought it was better for the bike. Others have said that it doesn't matter and I'm only paying more for gas than I have to.

I would like to know if that is true. I always use premium gas from stations like Exxon and Chevron to avoid crappy gas. I filled up at a walmart one time and about 20 miles into the tank the bike sputtered (while on the freeway). Another time while I was taking off from a light. I was convinced there was water or something in the gas. Never again have I filled up with crappy gas.

Will 93 octane gas be better for my bike or does it matter?
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Old 04-13-2012, 10:58 AM   #2
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what does the owners manuel say
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Old 04-13-2012, 10:59 AM   #3
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i mean think about it. We have performance bikes brah. haha, So i used Noventa y tres (93) all the time.
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Old 04-13-2012, 10:59 AM   #4
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From a particular gas station the different grades of fuel are of the same quality. Octane isn't a rating of how "good" the gas is, its just a rating of how resistant it is to pinging. If your bike doesn't ping on 87...........there's absolutely no benefit to running anything higher. Just keep buying gas from quality stations, and you'll continue to get quality fuel.
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Old 04-13-2012, 11:00 AM   #5
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Use top tier stations only. I use lower or middle grade all the time. I always have. Never had a problem on any of my bikes.
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Old 04-13-2012, 11:03 AM   #6
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if the owners manual says to use 87, then 91 or 93 will do nothing but decrease your power. higher octane does not mean it's cleaner, it means that it burns slower resulting in less detonation on high compression or pre-ignition on advanced timing engines.

87 burns faster so actually results in slightly more power as long as your bike does not suffer from knocking or pinging from one of the above scenarios
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Old 04-13-2012, 11:05 AM   #7
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Octane is related to compression. The lower octane fires at a lower compression leading to pre-ignition or "pinging" in high compression engines. It doesn't make more horsepower unless you are getting pre-ignition. The higher compression high octane has allows you the maximum detonation therefore more power is produced.
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Old 04-13-2012, 11:07 AM   #8
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Quote:
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Octane is related to compression. The lower octane fires at a lower compression leading to pre-ignition or "pinging" in high compression engines. It doesn't make more horsepower unless you are getting pre-ignition. The higher compression high octane has allows you the maximum detonation therefore more power is produced.
unless you could be running 87 but you are running 93 instead.
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Old 04-13-2012, 11:07 AM   #9
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I only use gas from top tier gas stations and 93 Octane. I also put a little Chevon Techron in the tank every other fill-up.
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Old 04-13-2012, 11:09 AM   #10
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Quote:
Originally Posted by po-po 5.0 View Post
From a particular gas station the different grades of fuel are of the same quality. Octane isn't a rating of how "good" the gas is, its just a rating of how resistant it is to pinging. If your bike doesn't ping on 87...........there's absolutely no benefit to running anything higher. Just keep buying gas from quality stations, and you'll continue to get quality fuel.
If the User's manual specify 89 or higher what's the risk of using 87? Also when talking about "pinging" or "knocking", what exactly mean with that term? the backfiring?
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Old 04-13-2012, 11:10 AM   #11
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Quote:
Originally Posted by sbfuller View Post
unless you could be running 87 but you are running 93 instead.
If you run 87 then you would have pre-ignition and have a loss of power is what I mean. 93 allows the maximum amount of fuel with out Pre-ignition occurring in high compression engines. I've haven't heard of low compression engines loosing power with 93 octane. Why does this occur?
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Old 04-13-2012, 11:23 AM   #12
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Quote:
Originally Posted by Higham View Post
If you run 87 then you would have pre-ignition and have a loss of power is what I mean. 93 allows the maximum amount of fuel with out Pre-ignition occurring in high compression engines. I've haven't heard of low compression engines loosing power with 93 octane. Why does this occur?
Because it burns slower. Say your engine is designed for 87 octane, and produces the most power when fuel is ignited at say 4 degrees past TDC. With 93 octane the fuel will burn a bit slower, igniting at maybe 6-7 degrees past TDC. Those numbers are obviously made up, but you get the idea.
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Old 04-13-2012, 11:30 AM   #13
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if your referring to your CBR954. 87 is all you need.
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Old 04-13-2012, 11:33 AM   #14
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It's not about burning slower or faster. It is about resistance to compression before spontaneously igniting.

In a gasoline engine, you want the spark plug to ignite the fuel air mixture. In a high compression engine, a low octane gas may spontaneously ignite prematurely before the piston has moved into position where the spark plug would ignite the mixture. This is called "knock" and is harmful for your engine.

If your engine is designed to use a certain grade gasoline then putting higher grade is a waste of money and putting in a lower grade could be harmful. Most cars these days have knock sensors so you can run on a lower octane gas and just lose power. But I don't know if motorcycles do.
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Old 04-13-2012, 11:34 AM   #15
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Quote:
Originally Posted by Princess View Post
Because it burns slower. Say your engine is designed for 87 octane, and produces the most power when fuel is ignited at say 4 degrees past TDC. With 93 octane the fuel will burn a bit slower, igniting at maybe 6-7 degrees past TDC. Those numbers are obviously made up, but you get the idea.
This^^^ use what your owner manual tells you. Every engine is designed to be run with a certain octance fuel.
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Old 04-13-2012, 11:38 AM   #16
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Quote:
Originally Posted by Princess View Post
Because it burns slower. Say your engine is designed for 87 octane, and produces the most power when fuel is ignited at say 4 degrees past TDC. With 93 octane the fuel will burn a bit slower, igniting at maybe 6-7 degrees past TDC. Those numbers are obviously made up, but you get the idea.
I was looking up some info on this while you posted and although you are correct the articles I've read seem to indicate that you should be careful when relating octane rating to a faster burn rate supposedly they aren't related. Which didn't really make sense too me since the higher octane fuels all seemed to have faster burn rates. Here's the link.

http://www.gonefcon.com/whatifdyno/combustion.htm
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Old 04-13-2012, 11:51 AM   #17
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If your motorcycle requires 89 or higher, run 93 octane. I have a friend who works at Valero and says since very few people run 89, it is often not nearly as "fresh" as the more common grade octanes.
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Old 04-13-2012, 12:02 PM   #18
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This topic has been discussed more than Jesus
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Old 04-13-2012, 12:04 PM   #19
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Quote:
Originally Posted by wackjum View Post
It's not about burning slower or faster. It is about resistance to compression before spontaneously igniting.

In a gasoline engine, you want the spark plug to ignite the fuel air mixture. In a high compression engine, a low octane gas may spontaneously ignite prematurely before the piston has moved into position where the spark plug would ignite the mixture. This is called "knock" and is harmful for your engine.

If your engine is designed to use a certain grade gasoline then putting higher grade is a waste of money and putting in a lower grade could be harmful. Most cars these days have knock sensors so you can run on a lower octane gas and just lose power. But I don't know if motorcycles do.
Some do, but a knock sensor just retards the timing enough to prevent pre-ignition, which will hurt performance and economy.
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Old 04-13-2012, 12:06 PM   #20
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Quote:
Originally Posted by Higham View Post
I was looking up some info on this while you posted and although you are correct the articles I've read seem to indicate that you should be careful when relating octane rating to a faster burn rate supposedly they aren't related. Which didn't really make sense too me since the higher octane fuels all seemed to have faster burn rates. Here's the link.

http://www.gonefcon.com/whatifdyno/combustion.htm
I used pretty bad wording. I should have said resistance to ignite.
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