<VV> Dry Gas - Methanol or Isopropyl ? Some Corvair

[FrankCB at aol.com]

Jim,
    Isopropyl alcohol (isopropanol) is about 6 times more effective than 
methanol though it costs a bit more.  Also "Iso" is less corrosive to fuel system 
components.  It comes with various names such as "Iso-Dri" or 
"DryGas-Isopropyl Water Remover".  Read the label.  If it says "toxic - methanol" it's the 
wrong stuff.
    Gas tank condensation can occur even in warm weather anytime the humidity 
is high and the day/night temperature swing is significant.  What happens is 
that high humidity air is sucked into the vented tank of the Corvair as the 
temp. begins to cool and as the temp drops further that air temp in the tank can 
drop below the dewpoint whereupon moisture condenses out of the air and 
settles on the top of the gas in the tank.  Being heavier, the water condensate 
soon settles to the bottom of the tank where it begins to rust/corrode the tank 
eventually resulting in fuel leakage from the pin hole leaks at the bottom of 
the tank.  (Ask me how I know(:-)
    So I use it on a regular basis throughout the year.  By using an additive 
like isopropyl alcohol you enable the gas to absorb the water and distribute 
it evenly throughout the tankful of gas.  It's only a small fraction of 1% of 
the gas so it has no effect on the firing of the engine.  
    And NO, it is not equivalent to water injection!!
    Frank "aquaman" Burkhard  

In a message dated 11/22/05 1:27:39 PM Eastern Standard Time, Jebfmc at aol.com 
writes:
Hi Guys, 

Winter and colder temperatures are upon us and so is gas tank  condensation. 
Which "Dry Gas" is better - Methanol or Isopropyl alcohol  based?

   Thanks,
Jim Bennetts
Akron, Ohio