[Diy_efi] WI, methanol, and corrosion

[Joseph Obernberger]

I have some videos showing the spary pattern of mcmaster car mini misting
nozzles on my water injection setup.  What do you think of the spray
pattern?  This is at about 80psi of pressure.
Thanks!  I'm enjoying this topic.
http://cybrina.mine.nu/MR2_Docs/Description.htm

                                                joeo

Mike wrote:

> no, not quite, its not an increase in pressure you are looking for...
>
> Its the fact that water is such a good absorber of heat, in fact
> weight for weight its about a million timer better than air !
>
> When water droplets in the chamber are heated enough they absorb
> a tremendous amount of heat as they make a 'phase' change into
> vapour. ie. From liquid water to vapour (gaseous water) the
> heat absorbed is called the 'latent heat of vapourisation' and
> is the most helpful part of high water injection rates.
> Although some benefit is had from gaseous vapour, the greater
> benefit is gained from the phase change in the chamber.
>
> So you dont want droplets too small otherwise they change to
> vapour before they get to the chamber and you dont want droplets
> too large or they do nutty things ;-)
>
> In fact, the more I think about it, and in concert with what I
> have seen over the years - many people may have confused water
> vapour with droplets. The former being a gas, the latter being
> a suspension in air - the two are radically different in heat
> content.
>
> Eg. Which has more heat, liquid water at 100deg C or vapour
> at 100deg C - although the temperature is identical, the vapour
> has far more heat and can cause far more burns than liquid
> water...
>
> rgds


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