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Author Topic: Octane Rating for EFI Bike(US Rider)  (Read 268 times)

onwingsoflead

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Octane Rating for EFI Bike(US Rider)
« on: July 04, 2018, 11:33:09 AM »

Ok. I'm having more fun on two wheel s that I've had in a long time. I searched this topic but seemed to find not much consistent info. Making this thread for posterity.
 
Those of you with GT or GTR in the US, what Octane Rating is best. Here in NC I have choice of 87, 89, or 93. Does it really matter? I know for my old Honda, 87 was the recommendation.  Everything else was a waste.

Those outside US can weigh in, but I don't know if the ratings are similar or not.
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umop-ǝpisdn

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #1 on: July 04, 2018, 12:29:23 PM »

The lower the better. ..remember what market these bikes were designed for.
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onwingsoflead

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #2 on: July 04, 2018, 01:40:28 PM »

That's what I figured. I just didn't seem to see anything in the OM, and all the discussion on here that I found via search was....inconclusive. I figure it probably doesn't matter. I've basically been running 90 Octane Ethanol Free gas, because one station near me has it, and Ethanol wrecked my Rebel's carbs a couple years back. But, if I'm not near there, I just put in 87.

Has Ethanol been as much of a problem with these bikes? I suspect no.
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umop-ǝpisdn

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #3 on: July 04, 2018, 09:06:51 PM »

I use E10. Never been an issue for me.
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madhatter

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #4 on: July 04, 2018, 10:30:42 PM »

The lower the better. ..remember what market these bikes were designed for.

What do you mean the lower the better?
I use the best gas in my bike I live in California
I don't really notice a difference, I've only put the best gas since I've got it.
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spit051261

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #5 on: July 04, 2018, 11:02:27 PM »

High performance engines are tuned to run on the highest octane fuel and running a lower octane could damage the engine.
Our engines are designed to run on low octane fuel.
Running your bike on high octane will make no difference.
« Last Edit: July 04, 2018, 11:07:47 PM by spit051261 »
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umop-ǝpisdn

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #6 on: July 05, 2018, 05:14:11 AM »

madhatter,

'Octane Rating' is a weird way of measuring how well a fuel resists 'pre-ignition'.

'Pre-ignition' is when the fuel:air mix starts to burn before the spark plug fires. It does this because all fuels have a point where they will spontaneously ignite. i.e. paper and a magnifying glass. There's no fire, but the paper starts to burn because it got hot enough to spontaneously ignite.

In short. High octane fuels burn less easily.

Fantastic for turbo engines, or engines with really high compression, like a Dodge Hellcat. Small reality check though, these engines are in no way similar to a Dodge Hellcat.

So, don't use high octane fuel, 'cause you'll get un-burned carbon build up.
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spit051261

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #7 on: July 05, 2018, 10:17:00 AM »

Don't think a higher octane is going to damage your engine.
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madhatter

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #8 on: July 08, 2018, 04:16:31 AM »

Don't think a higher octane is going to damage your engine.
It's not, I will never put shtty gas into my bike lol, I fill up with $12 using the best premium gas.
It burns better and increases power, since I've had it I've never put anything put premium #1 gas, imho..

But i'm from america and I'm sure you guys are not haha.
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Hylife

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Re: Octane Rating for EFI Bike(US Rider)
« Reply #9 on: July 08, 2018, 11:06:27 AM »

The ECU is tuned for the international standard of 91RON.
As the US continues to go its own way with regard to its' homegrown PON measurement (approximately PON = RON + MON / 2), the closest would be 87PON.
91RON + 83 MON / 2 = 86.5PON

Anything higher is just throwing money away as unburnt fuel and carbon out the exhaust.

As I have posted many times before, octane ratings are NOT a measure of power or efficiency. Higher octane fuel contains no more energy than lower octane fuel.
Octane is a measure of resistance to detonation.
The higher the octane, the later in the stroke the fuel burns.
If you burn too late then you actually loose power and expel unburnt fuel out the exhaust.
An incomplete burn will also carbon up your engines combustion chamber and exhaust.
High octane fuel can only deliver more energy if you add more oxygen to the combustion mix.
This can be achieved with a high compression engine, using NOS, or using a turbo.
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