IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: Scoobum on March 10 2013, 07:46:09 AM
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If you let gas sit around...does the octane level drop. If so...how quickly.
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down here, they say it is dropping within a month unless sealed air tight
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Sounds right, ,The more ethanol mixed in the lower the shelflife?
http://www.straightdope.com/columns/read/2668/why-does-gasoline-go-stale-so-quickly (http://www.straightdope.com/columns/read/2668/why-does-gasoline-go-stale-so-quickly)
http://online.wsj.com/article/SB121365158178678861.html (http://online.wsj.com/article/SB121365158178678861.html)
http://articles.cnn.com/2008-04-09/living/aa.bad.gas_1_gas-water-contamination-fuel/2?_s=PM:LIVING (http://articles.cnn.com/2008-04-09/living/aa.bad.gas_1_gas-water-contamination-fuel/2?_s=PM:LIVING)
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Yes, the aromatics are the first thing to flash off. Since those and the ethanol are the first thing to go, the octane does drop.
Keep in mind our fuel systems are sealed so it's not as big of a deal as it would be on a 60's car with a vented cap and vented float bowls (and expecting lead as an octane booster)
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Speaking of octane... Is it true that if you install an alky system, you can run regular 87 octane gasoline and not have any problems as long as you don't go above stock boost levels?
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I think so but calculate how long it will cost to pay for the sytem and the methanol you are buying
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and then calculate how long you can leave the wastegate at the stock boost level.
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not long Earl :P
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Stock boost should be within the limits of 87 octane without Alky- No?
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Stock boost should be within the limits of 87 octane without Alky- No?
Depends on the chip and how much timing it has I would imagine.
If you are going to get an alcohol kit (most cars should) then bump the boost and the timing and enjoy the car!! :rock:
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Stock boost should be within the limits of 87 octane without Alky- No?
I would guess the answer would be iffy. Oil control, outside temp and intercooler efficiency would be big factors. 12#'s would probably be doable on low octane ESP if the chip is burned for much higher boost.
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The ethanol doesn't evaporate - it sits there and absorbs a shit ton of moisture. Then the fuel separates. Especially in boat applications. Google it - ethanol is shit, and Stabil/etc don't work well.
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Checking back - 87 octane is roughly regular gas in 1987.
I can verify the car ran fine(street driven) on regular gas stock chip- stock boost.
Original headgaskets
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Checking back - 87 octane is roughly regular gas in 1987.
I can verify the car ran fine(street driven) on regular gas stock chip- stock boost.
Original headgaskets
Dave,
The gas of 1987 - 1990 is MUCH different than the gas of today. The gas back when our cars were new was decent compared to todays crap. If you don't believe me than put 87 octane in the tank and lets go for a quick WOT blast to OD while running a stock chip. :013:
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Dave,
The gas of 1987 - 1990 is MUCH different than the gas of today. The gas back when our cars were new was decent compared to todays crap. If you don't believe me than put 87 octane in the tank and lets go for a quick WOT blast to OD while running a stock chip. :013:
I miss MTBE: http://en.wikipedia.org/wiki/Methyl_tert-butyl_ether (http://en.wikipedia.org/wiki/Methyl_tert-butyl_ether)
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Where do you fill up, the US? The Mohawk/Husky gas we get here has MTBE, which I confirmed years ago with the chief chemist, unless they just got rid of it? I remember reading an article about gas that was denied shipment into the States because it had MTBE.
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Makes water taste bad at very low ( non harmful?) levels. Sounds like like a good thing.
Chemical canary?