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Why is gas octane rating 85-91 up north?
Posted on 7/2/16 at 1:57 pm
Posted on 7/2/16 at 1:57 pm
But down here in god's country its 87-93?
3
Posted on 7/2/16 at 1:59 pm to Cosmo
quote:
Why is gas octane rating 85-91 up north?
But down here in god's country its 87-93?
I've seen the lower octanes in CA as well. Not just the north.
It has to do with elevation levels I believe.
Posted on 7/2/16 at 2:01 pm to Powerman
Altitude. Thinner air.
Air is thinner the higher above sea level you go. Less air going into the cylinders means less pressure at top dead center when things go bang. It's a lot like lowering the compression ratio in the engine, reducing the need for high octane.
It's noticeably cheaper too.
Air is thinner the higher above sea level you go. Less air going into the cylinders means less pressure at top dead center when things go bang. It's a lot like lowering the compression ratio in the engine, reducing the need for high octane.
It's noticeably cheaper too.
This post was edited on 7/2/16 at 2:05 pm
Posted on 7/2/16 at 2:03 pm to Cosmo
quote:
But down here in god's country its 87-93?
The only place you'll see 85 octane is in high elevation areas such as Colorado because it is equivalent to 87. In other words, 85 regular octane is sufficient to protect against knock or detonation at higher elevations.
Posted on 7/2/16 at 2:09 pm to Cosmo
(no message)
This post was edited on 7/2/16 at 3:16 pm
Posted on 7/2/16 at 2:51 pm to grif82
Holy shite! Whoever posted that crap about how a refinery works has no fricking clue. I worked as an engineer at a refinery and I know how it works and that crap ain't it.
There's a lot of quality control in blending the components that go into gasoline and to imply that otherwise is sheer ignorance.
There's a lot of quality control in blending the components that go into gasoline and to imply that otherwise is sheer ignorance.
This post was edited on 7/2/16 at 2:57 pm
Posted on 7/2/16 at 2:55 pm to DavidA
From Wikipedia:
United States: in the US octane rating is displayed in AKI. In most areas, the standard grades are 87, 89-90 and 91-94 AKI.[41] In the Rocky Mountain (high elevation) states, 85 AKI (90 RON) is the minimum octane, and 91 AKI (95 RON) is the maximum octane available in fuel.[42] The reason for this is that in higher-elevation areas, a typical naturally aspirated engine draws in less air mass per cycle because of the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. However, since virtually all cars produced since the mid-1980s have fuel injection, 85 AKI fuel is not recommended for modern automobiles and may cause damage to the engine and decreased performance.[43] Another disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI (98 RON) is available.[44] As of January, 2011, over 40 states and a total of over 2500 stations offer ethanol-based E-85 fuel with 105 AKI.[45] Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI .[
United States: in the US octane rating is displayed in AKI. In most areas, the standard grades are 87, 89-90 and 91-94 AKI.[41] In the Rocky Mountain (high elevation) states, 85 AKI (90 RON) is the minimum octane, and 91 AKI (95 RON) is the maximum octane available in fuel.[42] The reason for this is that in higher-elevation areas, a typical naturally aspirated engine draws in less air mass per cycle because of the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. However, since virtually all cars produced since the mid-1980s have fuel injection, 85 AKI fuel is not recommended for modern automobiles and may cause damage to the engine and decreased performance.[43] Another disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI (98 RON) is available.[44] As of January, 2011, over 40 states and a total of over 2500 stations offer ethanol-based E-85 fuel with 105 AKI.[45] Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI .[
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