Whoever says lower octane fuel is better is crazy - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 27 Old 08-27-2016, 12:50 PM Thread Starter
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Whoever says lower octane fuel is better is crazy

I posted a couple posts about what octane fuel and get a mixed bag response. Well, I have been using 87 octane (American) and listened to the majority from online responses. No problems. Ride my bike daily and haven't a complaint.

87 or 92 octane for my Honda?

Today to test the water I tried 93 octane. Holy cow, what a world of difference. It's like I'm driving another bike. I'm using 92 or 93 from now on. The bike had much more noticeable power and response. It was day and night. I drove about 40-50 miles but knew after the first mile. It was great.

I can't understand how this is debatable. I even had someone respond that they thought the higher octane made their bike run sluggish. I don't get it. Unless Im missing something.
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post #2 of 27 Old 08-27-2016, 05:01 PM
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Same brand of fuel? Ethanol in the 87?
I was never able to test 87 myself as it's not available anymore in Germany but I'm really surprised by your report considering the engine was developed for 87.
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post #3 of 27 Old 08-27-2016, 09:24 PM
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if you want more power and feel more power
from using slower burning petrol in your
10.7:1 compression ratio engine, then
make yourself happy..

different petrol outlets have different quality
petrols at the pump, some old or dirty or
moisture laden [esp ethanol blends],
some fresh, clean and unpolluted..
aside from octane, this could be
your experience..

many riders including members here
have used and tried different octane
with no increase in power etc..
i have used 95RON= 91PON [USA]
and 98RON = 94PON [USA] in emergencies
and to avoid ethanol in 91RON [= 86PON]
over well known regular courses, with no
increase in performance etc..

altho, cbr250r and cbr300r both ran ok on
the slower burning ie, higher octane rated petrol..

these things have been tested and examined
by experts in engine design of both four
and two wheel vehicles engines..
with normally functioning engine
and normal clean petrol, the best for
our 10.7:1 compression ratio engine
is 91RON [about 86PON] petrol..

the potential problem for everyone
is pre-ignition [bad] which can lead to
serious engine damage..
higher compression ratio engines tend to
pre-ignite their compressed fuel gas
more readily than lower cr engines,
thus need slower burning petrol..
higher octane is slower burning..
lower octane is faster burning..

for our 10.7:1 cr faster burning petrol
ie, lower octane is 'better'..
faster burning fuel gas generates
a certain flame throw and shape,
which is a design element of
all modern engines..

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post #4 of 27 Old 08-27-2016, 11:05 PM Thread Starter
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I want to do some more consistent fuel usage with the same type and then switch for a little bit to make sure it's not all in my head. Another variable could be that I used a different brand of gas all together.

I swear my bike had more pep today after filling up with this gas.
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post #5 of 27 Old 08-28-2016, 05:49 AM
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Like Shisoshin I tried a full tank of 98 octane in my 300R after about 2 years of running my old 250R and the 300R on 91 Octane.
I went into this experiment with a completely unbiased mind and was happy to embrace any increase in performance.
Unfortunately there wasnt one...

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post #6 of 27 Old 08-28-2016, 06:15 AM
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In South Africa we only have 95 octane petrol. So that's all I can test hahaha.

I've now owned and rid the bike for over 3 years with no problem.
Maintain and look after the bike it should give you many years of joy.

Safe riding all.

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post #7 of 27 Old 08-28-2016, 10:28 AM
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PPP: Could it be the placebo effect? Medical studies have proven that it exists.
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post #8 of 27 Old 08-28-2016, 10:32 AM
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Quote:
Originally Posted by TrippplePPP View Post
I want to do some more consistent fuel usage with the same type and then switch for a little bit to make sure it's not all in my head. Another variable could be that I used a different brand of gas all together.

I swear my bike had more pep today after filling up with this gas.
As Schroeder asked in his post, did the 87 octane you were previously using contain ethanol?... if it did, and the gas you are using now doesn't have ethanol, then there is your answer. Ethanol blended fuels won't produce as much power as a non-ethanol fuel.

As for octane ratings, there seems to be a common misconception/urban myth that fuel with a higher octane number translates to increased performance, which is simply not true. As shisoshin wrote in his post, higher octane fuel is only needed to prevent detonation (aka pre-ignition or knock) in higher compression engines. And a fuel with too high of an octane number for a given engine can cause problems like difficult starting.
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post #9 of 27 Old 08-28-2016, 11:54 AM
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Despite all evidence to the contrary, I have also noticed an added bit of "pep" in the bike when I've experimented using higher octane gas. But like Schroeder and MotoMike suggest this could very well be due only to the fact that I used premium brand-name gasoline that contained less ethanol. The biggest difference I've noticed so far was when I used Shell 93 octane and a little less so when filling up with Mobil 91 octane.
Trying the same with mid or high octane grades of "generic" gasoline sold at box store or convenience store pumps yields far less noticeable results.
I can only surmise that there is indeed a noticeable difference when using nationally-branded gasoline with less ethanol content, however I'm not sure I'd want to run it in my bike all the time given it's intended purpose of combusting slower to prevent knocking. I can't see how this would not have a deleterious effect on the CBR's engine over a long period of continual use. While I may "treat" myself and my bike to lower ethanol, higher octane fuel on occasion, I think it's always best to follow the manufacturer's recommendations at least the majority of the time.
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post #10 of 27 Old 08-28-2016, 01:53 PM
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Quote:
Originally Posted by TrueFaith View Post
however I'm not sure I'd want to run it in my bike all the time given it's intended purpose of combusting slower to prevent knocking. I can't see how this would not have a deleterious effect on the CBR's engine over a long period of continual use. While I may "treat" myself and my bike to lower ethanol, higher octane fuel on occasion, I think it's always best to follow the manufacturer's recommendations at least the majority of the time.
You'd be surprised how many 16 year olds fill up their 125s with 93 fuel over here cause: Moar Pouwaaa!!!
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