[s-cars] water injection, before turbo?

[kirbyasmith]

Sucker carburated turbo cars like the Corvair didn't have intercoolers 
because in cold weather the fuel would condense out before reaching the 
cylinders.

kirby



Trevor Frank wrote:
> So from what I understand this is pretty common on rally cars, in the
> early days. 
> 
> 
> Issues, from what I read you will get erosion of the blades, pitting,
> eventually.
> 
> If you have and intercooler it is possible to condense the water in it.
> 
> You are adding water so that is helping clean the combustion chamber and
> increase detonation protection.
> 
> Here is my question, if you don't get it to cool again it may not
> decrease intake temps much?
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of kirbyasmith
> Sent: Saturday, October 23, 2004 10:15 PM
> To: Joe Pizzimenti
> Cc: s-car-list at audifans.com
> Subject: Re: [s-cars] water injection
> 
> 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
> injection damages compressors?
> 
> kirby
> 
> 
> 
> Joe Pizzimenti wrote:
> 
> 
>>That would be the best way to do it.  Mine's in the intercooler end
>>tank right before the outlet hose.
>>
> 
> 
>>On Fri, 22 Oct 2004 18:26:52 -0700 (PDT), Theodore Chen
>><tedebearp at yahoo.com> wrote:
>>
>>>yeah, i wondered about that, but that was a suggestion from somebody
>>>on another list.
>>>
>>>how is it installed in the hose?  did you splice in a piece of pipe
>>>and install the fitting in it?
>>>
>>>-teddy
>>>
>>>--- Mark Strangways <Strangconst at rogers.com> wrote:
>>>
>>>
>>>>WOW...
>>>>Do Not put it before the turbo
>>>>The water can damage the compressor.
>>>>
>>>>Mine is in the hose between the intercooler and the throttle body.
>>>>
>>>>Mark //S
>>>>----- Original Message -----
>>>>From: "Theodore Chen" <tedebearp at yahoo.com>
>>>>To: <s-car-list at audifans.com>
>>>>Sent: Friday, October 22, 2004 8:22 PM
>>>>Subject: [s-cars] water injection
>>>>
>>>>
>>>>
>>>>>where do you install the injector?  upstream or downstream of
> 
> the turbo?
> 
>>>>>seems like if you put it downstream of the turbo, it has to be
> 
> able to
> 
>>>>hold
>>>>
>>>>>up to 30 psi of boost.  there's not too many convenient places
> 
> to install
> 
>>>>>the injector in that case.
>>>>>
>>>>>-teddy
>>>>>
>>>>>
>>>>>
>>>>>
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