[s-cars] Water Injection

[Bruce]

I guess I'm mixing terms, using "water injection" to explain that I just
want to use water to get the intake temps down.

So question I'm wrestling with is do I go with water spray on the
intercooler (safe, easy to install, but not as much of a reduction in
temperature), or in the intake tract (more complicated install, potential
problems that Kirby outlines).

If intake, I am thinking after the intercooler to avoid condensation, and
would need to use high pressure pump and good misting nozzle to make sure no
un-atomized water is getting sucked into the intake combustion process.

B
----- Original Message -----
From: "Kirby Smith" <kirby.a.smith at verizon.net>
To: "Bruce" <brucem105 at comcast.net>
Cc: <s-car-list at audifans.com>
Sent: Saturday, July 06, 2002 10:12 AM
Subject: Re: [s-cars] Water Injection


> Let's not confuse water injection and water cooling.  Water injection
> cools the intake air directly by extracting the heat of evaporation.
> Water cooling cools the intake air indirectly by reducing the
> temperature of the intercooler.
>
> Where to water inject is a not-so-easily-answered question.  Up steam of
> the intercooler would ensure no liquid made it to the engine, and would
> be where the air charge temperature was the highest, thus evaporation
> the best.  On the other hand, injection upstream when the intercooler is
> still cold would lead to condensation in the intercooler.  This could be
> avoided by having a control system that was based on the intercooler
> output temperature.  Downstream of the intercooler might lead to cleaner
> valves, as the generation of steam from water mist at the valves is
> reported to clean them.  Best results in either case should result from
> use of good atomization nozzles, which implies high pressure water.
>
> kirby
>
> Bruce wrote:
> >
> > One big question I have is where should I inject the water? Outside of
the
> > intercooler seems safest, but most people seem to do it just after the
> > turbocharger. Any suggestions?
> >
> > Bruce
> > ----- Original Message -----
> > From: "mlp" <mlped at qwest.net>
> > To: "Bruce" <brucem105 at comcast.net>; <s-car-list at audifans.com>
> > Sent: Saturday, July 06, 2002 9:29 AM
> > Subject: RE: [s-cars] Water Injection
> >
> > > Ah ha, there.  Finally found it again.  A slightly better description
of
> > the
> > > old Old's system,
> > >
> > > http://www.tctc.com/~posumrun/mph/pageCLIP/page62JET/62jet.htm
> > >
> > > "....This was solved by adding a fluid injection system. A tank of
> > > "Turbo-Rocket Fluid" (a 50-50 mix of water and alcohol with some rust
> > > inhibitor added) was mounted under the hood. When the turbocharger
> > operated,
> > > it also pressurized this tank and caused a small amount of the fluid
to be
> > > injected into the intake between the carburetor and the turbocharger.
The
> > > fluid evaporated, absorbing heat from the intake air and preventing
> > > detonation.
> > >
> > > Oldsmobile was famous for conservative engineering, and the Jetfire
> > > turbocharger installation was no exception. A warning light informed
the
> > > driver when the Turbo-Rocket fluid ran low. If it was allowed to run
out,
> > a
> > > butterfly valve in the throttle body closed to prevent full-power
> > > acceleration. The wastegate was operated by two diaphragms in case one
> > > failed. Even if that happened, the cap on the Turbo-Rocket fluid tank
> > would
> > > pop off to prevent overboost. And if boost pressure was still too
high,
> > the
> > > butterfly valve would again shut down the party. One Olds engineer
told
> > Car
> > > and Driver, "It's 'safetied' to death."
> > >
> > > There you go Bruce, ".... a mixture of water, methyl alcohol & a rust
> > > inhibitor...."
> > > and Oldsmobile's famous conservative engineering.   What more can you
want
> > > in the way of proven engine safety.  Even the rust inhibitor shouldn't
be
> > > any kind of a problem
> > > with all the aluminum parts in the Audi's engine.  :-)
> > >
> > > mlp
> > >
> > > ~-----Original Message-----
> > > ~From: s-car-On Behalf Of Bruce
> > >
> > > ~As usual, I have read so much that I am more confused than when I
> > > ~started. (Rod, thank you for the great advice and URLs!!).
> > > ~
> > > ~In the bang for the buck performance category, and especially
> > > ~since my car sees a lot of track time, water or water/alcohol
> > > ~injection seems like a pretty good idea. I am going to try it.
> > > ~
> > > ~
> > >
> > >
> >
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