isopropyl
Thread Starter
Registered User
Joined: Jun 2007
Posts: 181
Likes: 0
From: Miami Beach, FL
isopropyl
I can get isopropyl at work pretty cheap and wanted to know how much I can put in to a 10 gallon tank without any problems? I have read that with all the gas companies selling E-10 you need to add some methanol or isopropyl to your gas to keep humidity out of the mix, thanks.
Registered User
Joined: Oct 2000
Posts: 15,323
Likes: 28
From: Longmont, CO
Based on reading wikipedia, isopropyl alcohol can be seperated from water by adding salt, but will not prevent water getting mixed in in the first place.
http://en.wikipedia.org/wiki/Isopropyl_alcohol
In fact, sounds like isopropyl alcohol is just as water soluble as ethanol.
http://en.wikipedia.org/wiki/Isopropyl_alcohol
In fact, sounds like isopropyl alcohol is just as water soluble as ethanol.
Isopropanol is a major ingredient in "dry-gas" fuel additive. In significant quantities, water is a problem in fuel tanks as it separates from the gasoline and can freeze in the supply lines at cold temperatures. The isopropanol does not remove the water from the gasoline. Rather, the isopropanol solubilizes the water in the gasoline. Once soluble, the water does not pose the same risk as insoluble water as it will no longer accumulate in the supply lines and freeze. Isopropanol is often sold in aerosol cans as a windscreen de-icer.
Registered User
Joined: Oct 2000
Posts: 15,323
Likes: 28
From: Longmont, CO
I respectfully suggest that the real question you should be asking is - Should you be putting in any at all? Again, ethanol, methanol and isopropyl alcoho all interact with water in the same way. Adding isopropyl alocohol to counteract ethanol is like spraying your car with water in order to dry it off.
Anyway, as far as how much if you still want to do it, a quick Google search turned up one suggestion of 12 oz per 10 gallons. (And additionally indicates that the reason isopropyl alcohol is added to gas tanks is because it mixes with the water and helps prevent the moisture from freezing in the fuel lines. But again, the ethanol does the exact same thing. That's why methanol is often used in water injection kits, because its less likely to freeze. You appear to be in Miami so freezing fuel lines isn't an issue anyway.)
Anyway, as far as how much if you still want to do it, a quick Google search turned up one suggestion of 12 oz per 10 gallons. (And additionally indicates that the reason isopropyl alcohol is added to gas tanks is because it mixes with the water and helps prevent the moisture from freezing in the fuel lines. But again, the ethanol does the exact same thing. That's why methanol is often used in water injection kits, because its less likely to freeze. You appear to be in Miami so freezing fuel lines isn't an issue anyway.)
Thread Starter
Registered User
Joined: Jun 2007
Posts: 181
Likes: 0
From: Miami Beach, FL
Originally Posted by Elistan,Jun 2 2008, 07:34 AM
I respectfully suggest that the real question you should be asking is - Should you be putting in any at all?
Trending Topics
Registered User
Joined: Sep 2007
Posts: 1,608
Likes: 1
From: Seattle
Originally Posted by MIAMI S-2000,Jun 3 2008, 05:46 AM
The reasoning behind my madness is that any combustible liquid that I can add to my gas tank that is cheaper than gasoline and will not do any harm to my engine will extend my average gas mileage. As expensive as gasoline is, I need all the help I can get. Thank you.
Registered User
Joined: May 2008
Posts: 222
Likes: 0
From: Upper Siberia
Guess what #1 ........... S2000 owners manual states no more than 10% ETOH.
Guess what #2 ........... Ethanol, methanol, isopropyl are ALL hydrophillic (attracts water). They ALL take up water and keeps it in solution. NONE will prevent water from getting into the gas.
Guess what #3 ........... If you use E10, you are already at the limit of alcohol content as dictated by your owner's manual. If you add ANY more alcohol, you will go beyond that 10%.
Guess what #4 ........... Don't believe everything you read in "Readers Digest".
Guess what #2 ........... Ethanol, methanol, isopropyl are ALL hydrophillic (attracts water). They ALL take up water and keeps it in solution. NONE will prevent water from getting into the gas.
Guess what #3 ........... If you use E10, you are already at the limit of alcohol content as dictated by your owner's manual. If you add ANY more alcohol, you will go beyond that 10%.
Guess what #4 ........... Don't believe everything you read in "Readers Digest".