***Ultra 94 at the price of reg. gas @ University and Weber PetroCan, Waterloo***

2stroker said:
Doesn't say anything about the effects of ethanol in that article. On my tank it says minimum 95 octane, I run V-power and an octane boost, 94 is not really 94 octane when ethanol is present. For a 4 stroke you should be ok with non Shell products, they are still the only fuel co.that states 0% ethanol right on the pump. Oh and about that can of worms. :lmao:
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94 octane is not really 94 octane with ethanol? Really? Care to elaborate??
 
Gotta love how the thread has deviated from an announcement about cheap gas to a pissing match over what gas is better... :confused:
 
rawr said:
Gotta love how the thread has deviated from an announcement about cheap gas to a pissing match over what gas is better... :confused:
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It always does..and a lot of people going on about how higher octane has "less power" or "more power"...how it will damage your engine..every time..sigh..
 
Put in what the manufacturer specifies. They design the engines to run on a certain type of fuel. The previous owner of my Prelude had to rebuild his engine after using 87 instead of 91. That is all.
 
Both my bike (CBR250R) and my car (Genesis Coupe) state that 87 is fine...so I stick with it.
 
Xtina said:
Put in what the manufacturer specifies. They design the engines to run on a certain type of fuel. The previous owner of my Prelude had to rebuild his engine after using 87 instead of 91. That is all.
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lol

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It's still amazing to see that even with the internet and the wealth of knowledge at your fingertips there still exists such ignorance and old tales about fuel.
 
Xtina said:
Put in what the manufacturer specifies. They design the engines to run on a certain type of fuel. The previous owner of my Prelude had to rebuild his engine after using 87 instead of 91. That is all.
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thanks for the laugh
 
But everybody knows that the more octanes there are, the more power.
 
Octane:
any of several isomeric liquid alkanes C[SUB]8[/SUB]H[SUB]18
[/SUB] - Merriam Webster

Thus Octane rating = how much octane (see above) is in the gas. the bigger the number the more octane (see above).

Now what does octane do?
Octane explodes just like most other hydrocarbons with the application of enough heat and/or pressure. Octane however is special in that the temp/pressure that it detonates at is fairly high (yay!) so this means that you need a spark to make it go boom.

Now whats wrong with the gas predetonating (blowing up on its own without the spark)?
Your cylinder in your engine is a tube and your fuel system pushes gas into said tube the piston (the part of the engine that goes up and down) compresses (squishes) the gas + air mix in the cylinder (place where all the gas and air is pumped). Now normally the spark plug (part that makes a spark) does its job and ignites (lights) the gas and air mixture when the piston is applying maximum pressure to the gas + air mixture thus pushing the piston down and generating power that you use. When you use gas with a lower octane rating that is required then this air + gas mixture explodes as a result of the increased pressure placed on it by the piston. This is bad since the engine is not ready for the gas + air mix to explode and can cause the destruction of the engine (detonation).

Ok so now we know what octane is and octane rating and why its important to not put a lower octane rated gas than the manufacturer (people who design and make your bike)

I hope this provides at least a basic understanding for more information which implore you to do is go to how stuff works (http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/question90.htm) and read more about it. There is alot of really good information on there.
 
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01cbr said:
Honest question.
Are there any issues with running a lower than recommended octane fuel in a EFI engine other than horrible fuel mileage?
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Freakin google what octane means!!!! Surprised there's actually some informed people in this discussion, usually there isn't.

Octane is a measure of a fuels resistance to detonation. Always run the lowest octane possible that will not cause detonation. Using a higher octane then necessary will only result in incomplete combustion and poor mileage. Using a lower octane then necessary causes premature detonation, the gas ignites too early in the pistons up stroke and will blow your pistons into little itty bitty pieces.

I know some people when way out in the country prefer to use 87 because of fears the 91 has been sitting there forever. I would do so at your own risk and preferably with a bit of octane booster.

EDIT: and ethanol is garbage. Far worse fuel mileage to achieve the same air/fuel ratio, and its horrendously corrosive and damaging to your fuel system. Best fuel to run in your stock bike that requires 91 is shell, as they do not put ethanol in their 91
 
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Depends mostly if your BIKE is Carborated, less likely for Fuel injected....
 
Why not make a sticky for the octane debate instead of hijacking this thread?

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FriendlyFoe said:
Freakin google what octane means!!!! Surprised there's actually some informed people in this discussion, usually there isn't.

Octane is a measure of a fuels resistance to detonation. Always run the lowest octane possible that will not cause detonation. Using a higher octane then necessary will only result in incomplete combustion and poor mileage. Using a lower octane then necessary causes premature detonation, the gas ignites too early in the pistons up stroke and will blow your pistons into little itty bitty pieces.

I know some people when way out in the country prefer to use 87 because of fears the 91 has been sitting there forever. I would do so at your own risk and preferably with a bit of octane booster.

EDIT: and ethanol is garbage. Far worse fuel mileage to achieve the same air/fuel ratio, and its horrendously corrosive and damaging to your fuel system. Best fuel to run in your stock bike that requires 91 is shell, as they do not put ethanol in their 91
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I know what octane means, you clearly dont know enough about it to answer my question.

The poster I quoted was mocking notion that 87 octane ruined a prelude engine. Now, a modern EFI engine can cope with too low of an octane without self destructing........ my question was are there any serious issues related to putting your engine through this.

I built a seadoo engine that required 110 octane. I know why it required that fuel and what would happen if I used pump gas.
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