more water injection

[M HILL]

> Date:          Tue, 10 Sep 1996 09:23:55 -0400 (EDT)
> From:          Dirk Wright <wright at uspto.gov>
> To:            diy_efi at coulomb.eng.ohio-state.edu
> Subject:       more water injection
> Reply-to:      diy_efi at coulomb.eng.ohio-state.edu

> OK, here's a really dumb (but interesting to me) question: If water 
> injection is so great, why is water in the gas considered so bad? Why 
> bother with products like "dry gas" if water in the cylinders is a good 
> thing? Why do most engines run so bad (I think) when there's water mixed 
> in with the gas in the tank? 
> 
> I can understand the freezing bit in winter, which could be cured with 
> added alcohol of glycol, but if water injection is so good, it seems that 
> you could save yourself a bunch of hassle by just adding water to the gas 
> in the gas tank. Is it possible that you only want water injection under 
> certain circumstances, like WOT? If so, then I could understand the need 
> for dry gas and a separate water injection system. Otherwise, what's the 
> deal?
> 
> 
> ****************************************************************************
> Dirk Wright 					            wright at uspto.gov
> "I speak for myself and not my employer."               1974 Porsche 914 2.0
> "A real hifi glows in the dark and has horns."            1965 Goodman House
> ****************************************************************************
> 
> 
I am led to believe that the reason you do not want water in the 
petrol tank is that water is heavier than petrol, and will therefore 
sit at the bottom of the tank and make it go rusty.  You are unlikely 
to get the water mixed up with the petrol.  I do not know much about 
the products used to remove water from the petrol tank, but I imagine 
they just make it all mix up together.  Thus enabling it to be pumped 
out of the petrol tank.

Martin