[s-cars] water injection

[Mark Strangways]

Yeah, just think of how well water cuts...
Aluminum, steel, cast .. etc.

Mark S
----- Original Message ----- 
From: "Larry C Leung" <l.leung at juno.com>
To: <s-car-list at audifans.com>
Sent: Sunday, October 24, 2004 10:09 AM
Subject: Re: [s-cars] water injection


> I'm no expert, but things I'd consider:
> 
> 1) Water is denser than gasoline, so an equal sized drop will
> carry abot 30% more mass/drop, therefore, from Newton's
> 2nd Law (F=ma) each drop hitting the impellor blades will
> increase the load by 30%, no clue on erosion effects
> 
> 2) Gasoline has a MUCH higher vapor pressure, so it may
> still atomize nearly completely before it hit the impellor of
> the Corvair's Turbo, especially in such an environment of
> high flow, swirl and turbulance. 
> 
> Just a few thoughts as to why the Corvair's turbo survived.
> My instincts say I doubt that a turbo impellor would be 
> happy having water thrown at it. From what I know, water
> is also quite abrasive at high velocities, don't know about
> gasoline. 
> 
> My $0.02
> 
> LL - NY
> 
> 
> 
> 
>> Date: Sun, 24 Oct 2004 01:14:58 -0400
>> From: kirbyasmith <kirbyasmith at gwi.net>
>> Subject: Re: [s-cars] water injection
>> To: Joe Pizzimenti <joe.pizzimenti at gmail.com>
>> Cc: s-car-list at audifans.com
>> Message-ID: <417B3A52.EA4B74D6 at gwi.net>
>> Content-Type: text/plain; charset=us-ascii
>> 
>> While injecting after the intercooler is clearly the most thermally
>> efficient approach, and before the turbo not recommended, there is 
>> some
>> question in my mind of just what damage occurs with upstream water
>> injection, assuming it is a fine spray.  Turbo Corvairs were of 
>> sucker
>> architecture, and at full boost (about 10 psi into 2.7 liters), the
>> Carter YH sidedraft carburator was certainly streaming gasoline 
>> that
>> hadn't yet vaporized right onto the compressor blades.
>> 
>> I never saw any sign of erosion on the blades of the OEM (TRW) 
>> turbo
>> compressor (reportedly good to 80 krpm) after 120 kmiles and 300 
>> laps
>> around Briar raceway, nor heard of erosion on the later available
>> aftermarket compressor (good to 120 krpm).  This, of course, 
>> doesn't
>> prove upstream water injection wouldn't be bad for a K24/K26/etc. 
>> Anyone know of any facts supporting the contention that upstream 
>> water
>>  damages compressors?
>> 
>> kirby
>>  
>> 
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