Re: What's the octane rating
[Re: BlueRacer69]
#3164408
07/30/23 10:57 PM
07/30/23 10:57 PM
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Joined: Jan 2003
Posts: 8,183 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,183
Plymouth, MI
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Last edited by Blusmbl; 07/30/23 10:58 PM.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: What's the octane rating
[Re: BlueRacer69]
#3164415
07/30/23 11:58 PM
07/30/23 11:58 PM
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Joined: Jan 2003
Posts: 21,546 N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,546
N.E. OHIO, USA
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Well if it works like it does at the pump there are two methods of obtaining octane numbers, RON or Research Octane Number (usually a higher octane number) and then there's MON or Motor Octane Number (usually a lower octane number). So here in the USA you'll see on the side or somewhere on the gas pump (R+M/2) ( RON + MON divided by 2) and if we use that for your 110+90/2 we would get 100 octane as you already figured you would get
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Re: What's the octane rating
[Re: BlueRacer69]
#3164424
07/31/23 05:41 AM
07/31/23 05:41 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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As others have posted, you can roughly just blend all these confused numbers RON, MON, AKI. But the important consideration is: what fuel rating do I need to keep the worst cylinder of my engine from detonating and damaging parts so badly that the engine must be rebuilt, or even replaced? In the past, were there any groups who had an urgent, life or death, worry about what fuel rating to use? Yes, the USA Army and Navy during the years when they were using gasoline like fuels. They rejected RON and MON. They researched the challenge and came up with the Army/Navy Performance Number commonly shortened to AN-PN. Gasoline powered aircraft fuel providers still give customers this number: https://warteraviation.com/fuels/avgas115-145/AN-PN is far more scientific and should have been used instead of Antiknock Index on USA gasoline pumps. AKI is one of the best examples of how bad decisions are made in Washington DC.
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Re: What's the octane rating
[Re: Dcuda69]
#3164492
07/31/23 12:05 PM
07/31/23 12:05 PM
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Joined: Oct 2015
Posts: 737 Michigan
BlueRacer69
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OP
super stock
Joined: Oct 2015
Posts: 737
Michigan
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Not sure on the rating or a formula to calculate it. My question would be...what are you using it for/in? I'm using it in my 69 Charger R/T 440 motor that has around 10 to 1 compression.
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Re: What's the octane rating
[Re: Pacnorthcuda]
#3165494
08/04/23 06:55 AM
08/04/23 06:55 AM
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Joined: Nov 2008
Posts: 5,965 Greenville, PA
redraptor
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master
Joined: Nov 2008
Posts: 5,965
Greenville, PA
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This thread is wandering, which is to be expected, so let me wander…. Think about this. Ethanol raises octane, so the cheapest way to create “premium” is to simply add more ethanol up to the allowable max (10 percent my state, though I seriously doubt that’s a spec that’s monitored to any degree). So when we need/buy premium, we might actually be getting more corn juice than the cheaper regular gas. But in that scenario the "premium" should be cheaper. Could we be getting ripped off!? The Sheetz stores around here offer 88 octane cheaper than 87 because it's E25 or something. Dunno. I use EF90 like the OP with an additive. Gunna try blending with race fuel soon.
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