[s-cars] 100 octane gas vs. water injection

[Kirby Smith]

In my opinion, no pressure you could generate with water injection would
ever equal the pressure in the detonation wave you avoid with water
injection.  Further, the water vapor reduces the temperature of the
charge, and, by extrapolation, the peak pressure of the burn in the
cylinder.  I don't recall ever reading that water injection causes
higher pressures.  Is there a reference I need to know about that
someone can name?

kirby

Bruce Mendel wrote:
>
> Rod,
>
> No sweat.
>
> For me, I had gotten to a HP level where I could not realize it all until I
> fixed a "bottleneck", which was intake temp/heat soak. That was clear during
> the summer, on the track all the time and even on the street.
>
> So I looked into the various methods, and water seemed like the least
> expensive, most effective, bang for the buck solution. An intercooler to do
> the same job as the water would have been at least three times as expensive,
> required bodywork, paint, etc., and my budget just did not allow for that.
> Now I can get all the power I'm making, and if I want to go up in power, the
> water can be upsized as well with a bigger nozzle and still keep intake
> temps low. Plus if I ever get a different turbo car (god forbid!), I can
> move it over with me.
>
> Plus, with the ~$2000 I saved, it'll pay for eight more track events next
> season. :)
>
> I'm curious about cylinder pressure as well....you think it's much
> different/worse than 26 lbs of boost to begin with? Maybe time for a metal
> head gasket!
>
> Bruce
> ----- Original Message -----
> From: <S4audinut at aol.com>
> To: <brucem105 at comcast.net>; <igor at s-cars.org>; <s-car-list at audifans.com>;
> <Audi20V_Kruemmer at yahoogroups.com>;
> <Audi5zylinderturbotechnik at yahoogroups.com>
> Sent: Friday, November 01, 2002 10:27 PM
> Subject: Re: [s-cars] 100 octane gas vs. water injection
>
> > --
> > [ Picked text/plain from multipart/alternative ]
> > In a message dated 11/01/2002 8:16:14 PM Eastern Standard Time,
> > brucem105 at comcast.net writes:
> >
> > > >>I agree it's not like turning up the boost, but it is exactly like
> > > getting a
> > > >>big fat effective intercooler, and has some extra benefits as well
> like
> > > >>cleansing the combustion chamber and sneaking in some extra fuel if
> you
> > > need
> > >
> >
> > I wasnt condemning the practice and it may be the most cost effective way
> to
> > run a car hard. But as you said (if I remember) that you didnt look at it
> as
> > adding power. I am afraid my obsession with getting 500 at the wheels
> colors
> > the way I look at things in general and I really dont think in terms of
> the
> > cars except as a way to go really fast very quickly. Sorry if I sounded
> like
> > I was condemning, You can and should see what the  cylinder pressure is
> when
> > pumping the water, you might be surprised how much higer the pressure will
> > run when you are injecting water, one of the list engineers could probably
> do
> > the math and tell you, I have heard that pressure runs very high.
> >
> > Rod
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