94 octane ummmmm good
- Thread starter Sloop
- Start date
umm... correct me if I'm wrong...
To my understanding the octane rating on gas is just the percent of the octane type hydrocarbon chain that is present in the gas. The rest is other stuff, like the septane hydrocarbon. (eg. 87 is 87% octane, 13% other)
So, wouldn't it be impossible, from this definition, to have 100+ or 103 octane gas. Is this just some marketing thing they did to get attention
"Help me out here, Midge"
To my understanding the octane rating on gas is just the percent of the octane type hydrocarbon chain that is present in the gas. The rest is other stuff, like the septane hydrocarbon. (eg. 87 is 87% octane, 13% other)
So, wouldn't it be impossible, from this definition, to have 100+ or 103 octane gas. Is this just some marketing thing they did to get attention
"Help me out here, Midge"
Octane is R+M/2. What that means is Ron Plus Mon divided by 2. Ron is a test engine that always preignites, and Mon is an engine that always...post ignites? i cant remember the technical term for it. so then you add both counts of knock and ping? and divide it by two, and that is youre octane RAting. Its not a percentage, its a rating.
its a gasolines ability to resist pre-ignition. not a how much of a certain chemical is in it.
Ron = Research Octane Number
Mon = Method Octane Number
These are two different methods for measuring the resistance to preignition of a fuel. Preignition is when the fuel self ignites during the compression stroke before the spark plug fires. That's what causes the knock, the gas mixture igniting before the piston can complete the compression stroke. When your knock sensor detects this, the ECU retards the timing to prevent the knock, which can rob you of some power but protects the engine from damage. Therefore, we run premium fuel in the MSP to prevent knock so we can get the most power out of our engines.
Since there are two different methods of measuring octane, they average the two methods numbers to arrive at what they print on the pump.
The number has nothing to do with % components in the fuel.
Mon = Method Octane Number
These are two different methods for measuring the resistance to preignition of a fuel. Preignition is when the fuel self ignites during the compression stroke before the spark plug fires. That's what causes the knock, the gas mixture igniting before the piston can complete the compression stroke. When your knock sensor detects this, the ECU retards the timing to prevent the knock, which can rob you of some power but protects the engine from damage. Therefore, we run premium fuel in the MSP to prevent knock so we can get the most power out of our engines.
Since there are two different methods of measuring octane, they average the two methods numbers to arrive at what they print on the pump.
The number has nothing to do with % components in the fuel.
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- 2018 CX-5 GT
fastdrvr & Kool: I guess you're right, I'm sure it is all in my head but it does feel like my car runs better on higher octane fuel. What I like most about it though is the gas mileage; it seems six of one half a dozen of another but I get more miles out of it but then there's the added cost per gallon. I guess what I really want to know is will it HURT my car to use 93? Because if it doesn't then I'd like to continue using it. Your advice is most appreciated, thanx!
I love it when people say things like this. Octane stabilizes the burn (to prevent knock as mentioned). It actually in its own way reduces the ignition potential of the fuel, making it less likely to preignite because of pressure (how diesel engines ignite).redmption said:
And yes, octane can go well above 100. I have seen 126 from the Blue Fuel people.
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- 03' Silverado, 03' P5
clownphish said:
Nah, it's not going to hurt anything, just cost a little more money.
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- 03' Silverado, 03' P5
blynzoo said:
I bet that would damage the O2 and/or cat. in a car... At the very least make your eyes water.. lol
Back in my 2-stroke dirt bike days, I actually bought 5 gallons from the airport gas station at my university that was quoted as being 130 octane. I have no idea what it was, but my Suzuki PE250 sure ran like a scalded dog with that stuff. Hell it might have been straight Ethanol. LOL
Same stuff. The stuff I'm talking about you get from a small plant near Indianapolis Raceway Park and a municipal airport. Meant to be aircraft fuel. Your Suzuki would have killed.fastdrvr23 said:
The turbo suziki (I can never spell the name correctly, so I wont try) can be boosted to 24psi with that stuff. Or 10 over normal, I think they run 14psi.
