Do do Ron ron


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Sadanorakman
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1991 GL1500 SE (Gold)

Do do Ron ron

Post by Sadanorakman »



Most standard petrol here in the UK now has 10% ethanol in it, but has remained for many years with an octane rating of 95 ron.

I've been worried to put this in my gl1500, so have been buying each station's 'premium' equivalent, which has only up to 5% ethanol, but also comes with an increased octane rating of 97 or even 99 ron.

I don't feel the bike runs particularly well on this premium fuel though, and know the gold wing only calls for minimum 91 Ron.
  • Is it ok to run her on 10% ethanol to obtain a slightly lower octane rating, or am I asking for clogged carbs?
  • Is the lower octane-rated fuel likely to burn a bit more readily than the unnecessarily-high octane rated 'premium' fuel?


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DenverWinger
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Re: Do do Ron ron

Post by DenverWinger »

E10 fuel is fine, in fact it is just about the only fuel available this side of the pond in 87 octane (RM/2)

If bike is going to be stored 6 months or more better to fill up with ethanol-free or E5 though.
There are 10 types of people in the world, those that understand binary numbers, and those that don't. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
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blupupher
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Re: Do do Ron ron

Post by blupupher »

DenverWinger wrote: Sat Sep 03, 2022 6:25 pm E10 fuel is fine, in fact it is just about the only fuel available this side of the pond in 87 octane (RM/2)

If bike is going to be stored 6 months or more better to fill up with ethanol-free or E5 though.
This.
E-10 is no issue when the bike is being ridden on a regular basis, but if putting in storage, E-10 can cause issues.
They make additives that you can add to fuel (Sta-Bil is the main one in the States, but there are others out there) that can extend storage time from months to years.
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Sadanorakman
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Re: Do do Ron ron

Post by Sadanorakman »

blupupher wrote: Sat Sep 03, 2022 9:57 pm They make additives that you can add to fuel (Sta-Bil is the main one in the States, but there are others out there) that can extend storage time from months to years.
Thank you both. I recently posted regarding my real-world (3 yeatr, 9 month) marine stabil 'test' here:
viewtopic.php?f=10&t=67588
..I was incredibly impressed!
Stabil not so cheap to buy here, so I'd only use it in the circumstances that I have.

I'll try E10 for my next fill then, and see if she is happier on that. I can revert to a tank-full of E5 with stabil when she gets laid up for winter!

Makes me wonder why the fuel in the US has such a lower octane rating: e.g. 87 Vs 95. Is it of a lower quality?
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Re: Do do Ron ron

Post by Rambozo »

Sadanorakman wrote: Sat Sep 03, 2022 11:54 pm Makes me wonder why the fuel in the US has such a lower octane rating: e.g. 87 Vs 95. Is it of a lower quality?
Just a different measurement system. R+M/2 Fuel is close to the same.

The great thing about standards, there are so many to choose from.
RON
MON
AKI (R+M/2)
RdON
Octane Index

Not to mention all the avgas specs...
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blupupher
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Re: Do do Ron ron

Post by blupupher »

US/Canadian 87 octane fuel is the same as European/Japanese 91 octane fuel.

Of course we in the US have to make it more complicated.
We get our rating by taking the Research Octane Number (RON (R)), and add the Motor Octane Number (MON (M)), add them together, then divide by 2 ((R+M)/2). This number is also called the Anti-Knock Index (AKI) or sometimes Pump Octane Number (PON).

Being in the US, most everyone just calls it 87/91/93 Octane, since most don't know about (R+M)/2, AKI, or PON.
Heck, most just say regular, mid grade, or super.

And don't forget we have areas that also have 85, 86, 88, 95, and 96 (R+M)/2 ratings available at normal fuel stations.
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DenverWinger
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Re: Do do Ron ron

Post by DenverWinger »

Octane ratings for the three fuel grades in Denver are two points lower, 85/89/91 instead of 87/91/93. Less air density due to the altitude (5280ft / 1.62Km) allows lower octane fuel for same results. If you burned Denver fuel at sea level you'd probably get some knocking and pinging.

Remember the Sunoco fuel pumps of the 60's where they didn't have just two or three fuel grades, they had a dial that went from "190" to "260", blended in the pump? I doubt the numbers really meant anything in particular though...
There are 10 types of people in the world, those that understand binary numbers, and those that don't. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
~Mark
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Sadanorakman
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1991 GL1500 SE (Gold)

Re: Do do Ron ron

Post by Sadanorakman »

Some fascinating inputs thanks guys.

I filled with E10, 95 RON as I said I would, and noticed zero difference in behaviour vs the higher-octane premium E5 I had been using.

Haven't worked out my mpg yet since, but that varies anyway depending on how heavy-handed I am on any particular day!

I'd like to think ethanol-free fuel would show some noticeable improvement in running, but I have no idea where to buy that in the UK!
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Re: Do do Ron ron

Post by Sidcar »

I’ve been running my GL1500 on E10 all year round since we got lumbered with it and I’ve not noticed any I’ll effects. If I was going to lay it up I would put some stabiliser in.
I tried E5 but didn’t notice any difference in performance,

Sid


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