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Old 07-19-2012, 04:10 PM   #1
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Question regular or premium gas...

MH,

Apologies as likely this has been discussed. But, on the ex-500 forum a guy said my bike actually would run better on regular octane gas than premium. No reason was given. Any ideas? I have burned Shell premium mostly, but the comment got my attention. Thoughts?

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Old 07-19-2012, 04:11 PM   #2
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whatever the owners manuel says

the bike is "tuned" for a certain octane.
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Old 07-19-2012, 04:14 PM   #3
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Owner manual says regular gas. Your bike doesn't need premium and fuel is just being wasted.
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Old 07-19-2012, 04:23 PM   #4
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If manual says regular, then higher octane won't make your engine run better or worse. The engine just won't take advantage of the higher knock resistance of the higher octane fuel.
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Old 07-19-2012, 04:29 PM   #5
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Also, pay attention to the units, not just numbers. Then look up the wiki on octane rating; mon, ron, and the average of the 2 (which is what the U.S. Uses, I believe).
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Old 07-19-2012, 04:43 PM   #6
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Quote:
Originally Posted by lucydad View Post
MH,

Apologies as likely this has been discussed. But, on the ex-500 forum a guy said my bike actually would run better on regular octane gas than premium. No reason was given. Any ideas? I have burned Shell premium mostly, but the comment got my attention. Thoughts?

stay safe,
Lucydad
Use the lowest octane possible without getting pre-detonation (pinging). Anything else is a waste of money and can actually degrade your mileage and power.
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Old 07-19-2012, 04:58 PM   #7
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Quote:
Originally Posted by RACER X View Post
whatever the owners manuel says

the bike is "tuned" for a certain octane.
+ 1.5 Billion
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Old 07-19-2012, 05:10 PM   #8
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Here is a thread I made a while back. I did a lot of research and the facts are, to the best of my ability, correct.
Read it and it will help you to understand some of the myths about gasoline and some of the truth...

http://www.motohouston.com/forums/sh...d.php?t=114922
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Old 07-19-2012, 05:11 PM   #9
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Old 07-20-2012, 07:30 AM   #10
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BBee--

Thanks for your illumination. I will check my manual, but I bet my 07 Kawa 500 with plain old carbs will likely run better on regular octane.

My interest in fuel type comes from running Ski-Doos at high altitude (10,000') back in the late sixties and seventies. Those two strokes, especially the high altitude modified high compression head models, definitely loved high octane gas. Early TNT racing machines used 100 octane aviation gas, with a bit of diesel for smoothness and of course 2 stroke oil mixed in. Our later model 3 cylinder, free air, 2-stroke Rotax Blizzards with very tuned expansion chambers and triple carbs ran best on methanol/oil mixes with a bit of diesel: true fuelies. they were fun.

cheers,
Lucydad
will try next tank this weekend with regular...
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Old 07-20-2012, 07:34 AM   #11
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You probably won't notice much difference but it's a good idea to give it a try. Maybe instead of filling up, just put a gallon or so in, see how it goes for a few miles.
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Old 07-20-2012, 07:43 AM   #12
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for carburated engines 87 is best
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Old 07-20-2012, 08:29 AM   #13
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Quote:
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for carburated engines 87 is best
Method of fuel administration has nothing to do with it.
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Old 07-20-2012, 08:36 AM   #14
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Quote:
Originally Posted by 675Raisinator View Post
for carburated engines 87 is best
Not true. MY HD is carbureted and the owner's manual recommends premium
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Old 07-20-2012, 08:54 AM   #15
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Safe bet, the manual says 91 Ron which is equavelent to the 87 we have here in the US.

All you are doing running higher than that is wasting $$.

Fuel delivery has nothing to do with it. Compression ratio, cylinder head design, and cam timing have significant rolls.
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Old 07-20-2012, 09:35 AM   #16
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An engine's octane requirement depends on a lot of variables and it doesn't stay constant:

Increases with:

Higher engine load, ambient/intake temp, engine temp, Compression ratio, ignition timing advance,

Decreases with:

Higher altitude,


So if you wack your throttle at a high gear and low RPM, going up a steep hill, in 100F Houston heat, riding two-up, loaded with gear, after sitting in traffic for a long while, and with your piston crown coated full of cabon deposits, your octane requirement will be a wee bit higher.

... than if you are just cruising solo in 50F December Houston breeze, taking it easy on a nice early Sunday morning, having done all your maintenance including a good seafoam job.
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Old 07-20-2012, 09:38 AM   #17
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Quote:
Originally Posted by Volfy View Post
An engine's octane requirement depends on a lot of variables and it doesn't stay constant:

Increases with:

Higher engine load, ambient/intake temp, engine temp, Compression ratio, ignition timing advance,

Decreases with:

Higher altitude,


So if you wack your throttle at a high gear and low RPM, going up a steep hill, in 100F Houston heat, riding two-up, loaded with gear, after sitting in traffic for a long while, and with your piston crown coated full of cabon deposits, your octane requirement will be a wee bit higher.

... than if you are just cruising solo in 50F December Houston breeze, taking it easy on a nice early Sunday morning, having done all your maintenance including a good seafoam job.
That's where on-board computers come in
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Old 07-20-2012, 09:47 AM   #18
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Quote:
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That's where on-board computers come in
Yap, if your engine has knock sensor and is running closed loop control and can the ign timing to just shy of impending knock. Most automobile engines these days have it. Not all bikes do. Not yet anyway.
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Old 07-20-2012, 09:48 AM   #19
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Quote:
Originally Posted by Volfy View Post
Yap, if your engine has knock sensor and is running closed loop control and can the ign timing to just shy of impending knock. Most automobile engines these days have it. Not all bikes do. Not yet anyway.
Most bikes currently don't have knock sensors, and only since they've started to get cats do a handful run closed loop.
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Old 07-20-2012, 09:50 AM   #20
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Quote:
Originally Posted by Volfy View Post
Yap, if your engine has knock sensor and is running closed loop control and can the ign timing to just shy of impending knock. Most automobile engines these days have it. Not all bikes do. Not yet anyway.
My CBR has a knock sensor
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