87 or 92 octane for my Honda? - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 13 Old 08-13-2016, 12:09 AM Thread Starter
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87 or 92 octane for my Honda?

I took my bike to a bike mechanic for the first time and he said I should use 92 octane (usa) for my honda. Previous threads stated I should use 87 octane gas. I'm not sure what to do. The mechanic said 87 is the minimum yet 92 octane would be better for the bike. Let me know what you think.

I heard the 92 octane will over heat the engine and cause problems. Again, not sure what to do.

Here is my previous thread about the subject.
What octane gas to use?
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post #2 of 13 Old 08-13-2016, 03:28 AM
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Well, your previous thread has got you covered.
87 will work just fine. 92 is pretty much overkill but should work as well.

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post #3 of 13 Old 08-13-2016, 09:13 AM
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87, only. Mild compression ratio and tune doesn't need 92. In fact it'll probably run worse.

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post #4 of 13 Old 08-13-2016, 09:39 AM Thread Starter
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Thanks guys. I second guessed the first thread I made due to my mechanic stating to use the high octane. I did read a few other threads last night and it seems most say use 87 and a minority say use the high octane.

One thing the mechanic stated was to use brand name gas like Exxon, Sunoco, shell rather than the grocery store, wawa and sheetz type of gas. I think I will listen to this advice though.
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post #5 of 13 Old 08-13-2016, 03:38 PM
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Hi guys, just my two cents.
I've taken alook at my owners manual and it stats 91 and higher and on another note my country only sells 95.

Take a look at the screen shot



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post #6 of 13 Old 08-13-2016, 04:18 PM Thread Starter
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Again, now I'm confused as hell. No matter where you look there is 50/50 on this subject. Each side swears they are correct and the opposing side is ruining their engine.
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post #7 of 13 Old 08-13-2016, 04:36 PM
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Quote:
Originally Posted by Mufasa View Post
Hi guys, just my two cents.
I've taken alook at my owners manual and it stats 91 and higher and on another note my country only sells 95.
I'm sure your 95 is a RON number. That's 90 in the US. 91 RON = 87 US Octane = Regular fuel. I believe octane is measured as (RON+MON)/2 in the US and that's why it differs from just RON.

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Originally Posted by TrippplePPP View Post
Again, now I'm confused as hell. No matter where you look there is 50/50 on this subject. Each side swears they are correct and the opposing side is ruining their engine.
The CBR was designed for Regular fuel period. It is a bike that is sold in large quantities in poorer Asian countries where people often times don't even have access to premium fuel so how stupid would Honda have to be to equip their bike with an engine that needs 92 octane (that would be ~ 97/98 octane in RON).
In the end no one is ruining his engine as it can stomach both fuels but one group is paying more than the other without any benefit.
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post #8 of 13 Old 08-13-2016, 04:40 PM
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Use what you'd like. If you have a big choice go for the in between. I'm sure the engine will perform as it should.
I've now used premium 95 for over 3 years and 28000km and my engine is going strong.

So use what you can best afford.

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post #9 of 13 Old 08-13-2016, 08:23 PM
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'research octane number' = RON..
91RON = [approx] 86/7PON [usa]..

compression ratio is one element of combustion
chamber design and engine 'tuning', based on
various parameters including flame throw
or shape thus burning rate..
higher combustion requires slower burning fuel,,
ie, higher octane rated fuel..
[cbr600rr for eg cr = 12:2:1, moto3 250 = 15:1]

in our combustion chambers at cr 10.7:1
we dont need slower burning fuel
which wont/cant work better in
our/this engine..

at higher cr pressure etc increases risk of
pre-ignition [bad], thus slower burning fuel
[higher octane] is used to suit that cr etc,
so as to avoid pre-ignition..

[high performance engines typically have higher cr
thus require/use higher octane fuels,, which has
created the false idea that high octane rated fuel
gives more hp,, ie, in low cr engines]

if your honda tech has recommended using higher octane
fuel, you should ask him why this is so, in particular
if he has detected signs of pre-ignition, etc..

also, 'premium' used for petrols is not a tech term
meaning 'better' etc, rather premium relates to
cost or the consumer, the premium you pay..
there are additive packages in premium petrol
typically intended for car/truck etc engines,
which are not designed for this 250 single..
you pay more for, the additive package..

basically, your engine will work better, on faster
burning [lower octane] petrol..
some authorities claim that using high octane
petrol in low cr engines can cause damage
over the long haul,, yet members here have
used higher octane with no obvious
harm and barely discernable difference
in general performance..

ive used it a few times to avoid ethanol
when low on fuel at night etc..
no obvious difference [altho it is also mixed
with whatever petrol is still in the tank]
over known routes etc..
no increase, in performance..

those are the basics of the question
as its been thrashed out here and
on other forums etc..
use search box or search
inet yourself..

honda recommends 91ron [86pon] 'or higher'
'or' means an alternative to that recommended,
which could be possible given symptoms of
pre-ignition etc.. quality of petrol could be
a factor, which is one reason i and others
recommend using known medium/high
turnover outlets [fresher/cleaner fuels]
and no ethanol..
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post #10 of 13 Old 08-14-2016, 01:15 AM Thread Starter
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You guys are great. Thanks so much for spelling it out for me. I appreciate it very much.
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