What fuel do you use in your CBR?
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I use Caltex Vortex 95. You're probably better off using 91 or 95 octane because the engine is old, but if it runs fine on 98 octane and you've got the money to spare then it's probably better for it.
I've been wanting to try 98 octane in my MC19 and I'll probably do it the next time I fill up, but mine runs pretty much the same on both 91 and 95 octane.
I've been wanting to try 98 octane in my MC19 and I'll probably do it the next time I fill up, but mine runs pretty much the same on both 91 and 95 octane.
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there is no point using 98 octane... a massive waste of money on a bike/car that doesnt need it
you're not confused.Mr5un said:
it may seem that some Shell stations are still providing unleaded 91 octane (no ethenol) as well as e10. The Shell station near my work has both, with it's e10 being 94oct + 10% ethanol. I actually thought that it was my petrol station that was the only one that was providing normal 91 octane unleaded as no other Shell station seems to be doing it here in Sydney.
i don't have an issue with ethanol per se, its just that i hear anecdotal evidence that the acidic nature of ethanol can swell rubber. if you have a thin rubber diaphragm in your carby (as you do, if you have a cbr) then replacing fucked rubbers comes in at around 80-100 a pop.
lol, ours really aren't that high performance. consider that they were built when 91 RON was the norm. i use 95 now because i can't find ethanol free 91SMOKEU said:
you may notice that some petrol stations are shutting down for refurbishments? that because there is a government mandate that all 91 must contain 10% ethanol. not sure if that is NSW or federal.aus36 said:
half your luck. like i said, i don't have a particular problem with ethanol, as long as it doesn't affect food crops. but thats another issue altogether.SMOKEU said:
It might be high peformance with respect to power for its size, and its rpm range, but its still an old engine, these engines were made for 91 Octane, infact afaik, 95 and 98 RON weren't even available when the 2fiddy engine came out in the 80's.
98 RON should only be used in engines that have a high compression. see here:
"Octane rating does not relate to the energy content of the fuel (see heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner. Where octane is raised by blending in ethanol, energy content per volume is reduced."
"Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause autoignition.
"It might seem odd that fuels with higher octane ratings are used in more powerful engines, since such fuels ignite less easily. However, an uncontrolled ignition is not desired in a spark ignition engine."
"Many high-performance engines are designed to operate with a high maximum compression, and thus demand high-octane premium gasoline. A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than a particular engine was designed for. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Since switching to a higher octane fuel does not add any more hydrocarbon content or oxygen, the engine cannot produce more power."
Basically, whatever the CBR Manual says to use, will give you the best performance, for those who say their bike runs shitty on 91 or 95, its probably because 98 is harder to burn, and likes to stay behind in a lower compression engine, can apparently clog shit up Ive heard.
98 RON should only be used in engines that have a high compression. see here:
"Octane rating does not relate to the energy content of the fuel (see heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner. Where octane is raised by blending in ethanol, energy content per volume is reduced."
"Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause autoignition.
"It might seem odd that fuels with higher octane ratings are used in more powerful engines, since such fuels ignite less easily. However, an uncontrolled ignition is not desired in a spark ignition engine."
"Many high-performance engines are designed to operate with a high maximum compression, and thus demand high-octane premium gasoline. A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than a particular engine was designed for. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Since switching to a higher octane fuel does not add any more hydrocarbon content or oxygen, the engine cannot produce more power."
Basically, whatever the CBR Manual says to use, will give you the best performance, for those who say their bike runs shitty on 91 or 95, its probably because 98 is harder to burn, and likes to stay behind in a lower compression engine, can apparently clog shit up Ive heard.
I run my mc19 on 98. As for people complaining about the money, you must be a real tight arse as it only uses a fraction of fuel that a car uses. And i thought that Japan only had 100 octane or something like that? (might not be true) Anyway i have always used 98 and i probably always will. Just ask a mechanic what they would use and if your bike got tuned with a certain fuel then wouldn't that be the best fuel to use?
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