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post #1 of 30 (permalink) Old 05-26-2009, 08:36 AM Thread Starter
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fuel types

just curious as to see what kind of gas people use. any mixes or whatever
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post #2 of 30 (permalink) Old 05-30-2009, 09:15 AM
 
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91 octane :)
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post #3 of 30 (permalink) Old 05-30-2009, 11:37 AM
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use what ever your book tells you to use
03-06 sould be 87, 07+ is 91

if your not getting pinging, you dont need any more than what the book says, and more would be wastfull.


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post #4 of 30 (permalink) Old 06-01-2009, 04:25 PM
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93 here...

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post #5 of 30 (permalink) Old 06-01-2009, 05:18 PM
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Anything above your recommended octane in the manual is a waste.

Higher octane is difficult to burn, and it's great for high compression motors, but especially on the 03-06, you don't need it. The newer RRs need higher octane, but anything higher that the recommend octane is a waste.

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post #6 of 30 (permalink) Old 06-01-2009, 05:29 PM
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i put 89 in mine the other night. ran half of it out pretty quick. i was wondering why it went faster then normal =/ ill stick with 87 then
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post #7 of 30 (permalink) Old 06-01-2009, 05:30 PM
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post #8 of 30 (permalink) Old 06-01-2009, 05:31 PM
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Originally Posted by DANGITSBRANDON View Post
i put 89 in mine the other night. ran half of it out pretty quick. i was wondering why it went faster then normal =/ ill stick with 87 then

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post #9 of 30 (permalink) Old 06-01-2009, 05:44 PM
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Theres this one guy that put NOS in his gastank, woked out pretty well for him.

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post #10 of 30 (permalink) Old 06-02-2009, 06:40 PM
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[quote=chipmunkofdoom2;2370010]Anything above your recommended octane in the manual is a waste. quote]

True, but you have to remember that:

1. The manual says "86 OR HIGHER" octane

2. 03-06 have 12.5:1 compression. (there is a general rule, which I suspect may be true, that says if you move your compression decimal point over 1 digit to the right, you get your optimal octane rating, but i'm not sure if you can apply this to high revving bikes)

3. Our engines rotate at such high speeds (internally) that you're prolly not going to actually hear any detonation, especially when you also factor in the loudness of the bike itself. you could be detonating and not even know it.

I've been struggling with the octane question for a while now and I can't seem to find a definitive answer, but wouldn't you rather foul your plugs over a long period of time that destroy your internals?

your only saving pennies at the pump anyway.

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post #11 of 30 (permalink) Old 06-02-2009, 06:44 PM
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Quote:
Originally Posted by chipottley View Post
Quote:
Originally Posted by chipmunkofdoom2 View Post
Anything above your recommended octane in the manual is a waste.
True, but you have to remember that:

1. The manual says "86 OR HIGHER" octane

2. 03-06 have 12.5:1 compression. (there is a general rule, which I suspect may be true, that says if you move your compression decimal point over 1 digit to the right, you get your optimal octane rating, but i'm not sure if you can apply this to high revving bikes)

3. Our engines rotate at such high speeds (internally) that you're prolly not going to actually hear any detonation, especially when you also factor in the loudness of the bike itself. you could be detonating and not even know it.

I've been struggling with the octane question for a while now and I can't seem to find a definitive answer, but wouldn't you rather foul your plugs over a long period of time that destroy your internals?

your only saving pennies at the pump anyway.
you WILL hear the pinging, its very decernable


and pennies?

lets see, 50 cents a tank, a tank every other day for me, thats 2 dollars a week? 52 weeks in a year, thats 104 dollars a year, or about 500 dollars over what the average person might keep a bike .... thats not bad

and as far as your rule of thumb, i have neard heard such a thing, and ive been building race motors for 10 years.


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post #12 of 30 (permalink) Old 06-02-2009, 06:50 PM
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Quote:
Originally Posted by tenjin View Post
you WILL hear the pinging, its very decernable


and pennies?

lets see, 50 cents a tank, a tank every other day for me, thats 2 dollars a week? 52 weeks in a year, thats 104 dollars a year, or about 500 dollars over what the average person might keep a bike .... thats not bad

and as far as your rule of thumb, i have neard heard such a thing, and ive been building race motors for 10 years.
Yeah guys. Just try it. I did and I noticed no difference when using 87 rather than 91. Still rides like she has. And they only call it V=Power because of it's rating, not because it has additives because they all do. Shell gas is the cleanest around whether you use 93 or 85. But back to topic, my bike has a slight tick to it as im sure everybodies does and it'll do it with any grade you use. I'm probably the highest in altitude than anybody here so my bike starves for air anyways but the change in grade of fuel did nothing but save me $$$$$$$$ :icon_stud


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post #13 of 30 (permalink) Old 06-03-2009, 10:42 PM
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google "top tier gas" and you'll see why i only use chevron and shell. mobil sometimes, but only out of convenience.

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post #14 of 30 (permalink) Old 06-04-2009, 04:09 PM
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Quote:
Originally Posted by tenjin View Post
you WILL hear the pinging, its very decernable


and pennies?

lets see, 50 cents a tank, a tank every other day for me, thats 2 dollars a week? 52 weeks in a year, thats 104 dollars a year, or about 500 dollars over what the average person might keep a bike .... thats not bad

and as far as your rule of thumb, i have neard heard such a thing, and ive been building race motors for 10 years.
I'm simply saying that the risk of fouling plugs is more acceptable than the risk of ruining internals. and the rule of thumb i speak of came from a proffesor of automotive engineering at WWU, but I'm sure there are many more factors to consider when using said rule (I.E. rotating mass/speed/induction/timing/etc.)

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post #15 of 30 (permalink) Old 06-04-2009, 06:42 PM
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Quote:
Originally Posted by chipottley View Post
I'm simply saying that the risk of fouling plugs is more acceptable than the risk of ruining internals. and the rule of thumb i speak of came from a proffesor of automotive engineering at WWU, but I'm sure there are many more factors to consider when using said rule (I.E. rotating mass/speed/induction/timing/etc.)
I agree with you, chipottley.

Respectfully, tenjin, you're wrong. This isn't a diesel engine. You won't hear pinging since there are deliberate parts in the bike to silence engine noises. Plus gas doesn't have the explosive power to "ping" as people on this site are attempting to explain. You won't hear pinging. And it's a matter of engine kinetics that makes chipottley right.

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post #16 of 30 (permalink) Old 06-09-2009, 06:43 AM
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I haven't experienced knock on a bike, but I can feel-hear it in a car. Sounds like a box of marbles in a trash can! The CBR has a knock sensor, which should retard timing when knock occurs, but I bet I would feel/hear it before the timing was retarded.

Higher octane fuel has a higher ignition point and burns slower than fuel of a lower octane. The reason higher octane fuel is recommended for engines with higher compression is hot spots and compression temp. As the engine runs edges of parts (raises on piston, valve edges, etc) become hot and retain the heat, which when combined with the compression can ignite the fuel prior to the spark plug firing. Diesels actually run without spark plugs (after warming by glow plug) by compressing the fuel to the point of ignition.

Using fuel of a higher octane than required can actually hurt performance, as higher octane fuel burns slower and may not be completely burnt by the end of the power stroke.

Just my .02
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post #17 of 30 (permalink) Old 06-11-2009, 09:19 PM
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Quote:
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I haven't experienced knock on a bike, but I can feel-hear it in a car. Sounds like a box of marbles in a trash can! The CBR has a knock sensor, which should retard timing when knock occurs, but I bet I would feel/hear it before the timing was retarded.
I wasn't aware of our bikes coming w/a knock sensor. that's good to know, but i bet none of us would be able to hear any detonation 'cause of part sizes, rotational speed, insulation dynamics, etc.

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Using fuel of a higher octane than required can actually hurt performance, as higher octane fuel burns slower and may not be completely burnt by the end of the power stroke.

Just my .02
Understandable, but with close to 100rwhp on our bikes, doesn't it make sense to run the risk of losing tiny ammounts of fuel and power (and possibly foul plugs over a relatively long time) rather than risk ruining internals?

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post #18 of 30 (permalink) Old 06-11-2009, 09:33 PM
 
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+1 I try to only use shell
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post #19 of 30 (permalink) Old 06-11-2009, 10:09 PM
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This has all been extremely enlightening. But have we come to a consensus? I was never worried about this until just now. A recap maybe? Or Pro/Con of octane levels might serve us well. I am sure a ton of people would benefit from such a thing!

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post #20 of 30 (permalink) Old 06-12-2009, 09:55 AM
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Quote:
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I wasn't aware of our bikes coming w/a knock sensor. that's good to know, but i bet none of us would be able to hear any detonation 'cause of part sizes, rotational speed, insulation dynamics, etc.
Since the engine is bolted directly to the frame I would bet you could feel it in the seat of your pants. Detonation is also very noticeable from a performance standpoint; i.e., you'll know it if it is anything but the most minute pre-ignition.

Quote:
Understandable, but with close to 100rwhp on our bikes, doesn't it make sense to run the risk of losing tiny ammounts of fuel and power (and possibly foul plugs over a relatively long time) rather than risk ruining internals?
Detonation is more likely at lower RPM under load because the fuel has more time exposed, so really your bike is more likely to be making 20 or 30 HP when it happens.

What we need is someone with access to a dyno to do runs on a stock bike with 87, 89, and 91 octane and post the results. That would put an end to this and probably bring world peace!
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post #21 of 30 (permalink) Old 06-12-2009, 10:00 AM
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I'm simply saying that the risk of fouling plugs is more acceptable than the risk of ruining internals.
Since when has ANYTHING recommended by Honda and the manual ruined a Honda motorcycle?

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post #22 of 30 (permalink) Old 06-12-2009, 12:34 PM
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Quote:
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What we need is someone with access to a dyno to do runs on a stock bike with 87, 89, and 91 octane and post the results. That would put an end to this and probably bring world peace!
I think that's a GREAT idea!!! I wish I could help.

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Since when has ANYTHING recommended by Honda and the manual ruined a Honda motorcycle?
That's not really fair to Honda, since they can't recomend a fuel that isn't available in all states/countries. That's why the Shop Manual says 86 or higher.

What we're trying to figure out, is what fuel octane is optimal, not just acceptable.

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post #23 of 30 (permalink) Old 06-13-2009, 12:47 AM
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they can't recomend a fuel that isn't available in all states/countries. That's why the Shop Manual says 86 or higher.
What we're trying to figure out, is what fuel octane is optimal, not just acceptable.
That's also something to keep in mind. Honda has to cover all the bases (availability and measurement method), so their printed manual is probably a few point high to prevent lawsuits.
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post #24 of 30 (permalink) Old 06-13-2009, 01:27 AM
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i have only used 91 octane chevron in my bike.

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post #25 of 30 (permalink) Old 06-13-2009, 01:30 AM
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nothing lower than 91
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post #26 of 30 (permalink) Old 06-13-2009, 01:30 AM
 
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I would love to see some dyno numbers using different octane ratings. If anyone has access to a dyno that would be awesome!
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post #27 of 30 (permalink) Old 06-23-2009, 03:16 AM
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I always run 91 in my bike. But tonight i wanted to experiment so i went with 100 octane race fuel. Didn't notice any difference. Seemed the exact same to me.


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post #28 of 30 (permalink) Old 06-23-2009, 03:03 PM
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ignoring the hype the ferrari uses shell in there f1 cars I can say that on the dyno 89 shell used to be hands down the best when tuning. However where there v-power 91 came out that has a slight margin over it. Some people call the gains noise but on a motorcycle that noise is worth chasing.
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post #29 of 30 (permalink) Old 06-25-2009, 07:26 PM
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i think if you dont run 93 your crazy. i put turbo blue in my older f3 and that makes a world of difference.
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post #30 of 30 (permalink) Old 06-25-2009, 08:43 PM
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You can put 100 octane or higher if you want but if its not tuned you're hurting the motor!
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