<VV> Wintrer Projects

Fri Nov 1 13:52:37 EDT 2013

Normally, water injection does not pose a threat to seats unless they
were installed with too loose of a fit to begin with. I have worked on
several water injected air cooled aircraft engines in the 2000 hp and
up class and the seats stay in fine.

I routinely changed seats during overhaul using a water injected seat
tool, where water only hits the inside of the seat, not the cylinder
head, then to install, heated the head to 600 degrees and put the seats
in the freezer for a few hours. Worked great.
Mark Durham

Sent from my Windows Phone
From: Michael McCrae
Sent: 11/1/2013 9:09
To: paul fox; Smitty; virtualvairs at corvair.org
Subject: Re: <VV> Wintrer Projects
As a side note here, another drawback to a direct steam injection of
water to a turbo compressor is its erosive qualities. After two years
of using my injection system on a daily basis, I noticed deep pitting
in the compressor which caused me to change it out..(and E-flow
compressors aren't cheap). I'm not sure if a heavy mist would have
prevented this or not....Smitty...???

Mike McCrae

Date: Fri, 1 Nov 2013 06:36:13 -0700
From: paulvair at yahoo.com
Subject: Re: <VV> Wintrer Projects
To: mmccrae6 at cox.net; vairologist at cox.net; virtualvairs at corvair.org

Smitty,I had a Corsa with the center mount Holley. The power valve
failed when the engine backfired once. It dumped a bunch of raw fuel
into the manifold and all of a sudden. The horrible death clatter
began. I think the count was 4 valve seats fell out all at once.
Needless to say the engine was scrambled. Ever since I use a power
valve block off when I use a Holley carb. Even gas can super cool
seats enough to drop out. Water injection can work fine as long as
it's just a mist. But if too much is dumped in all at once all bets
are off.Paul Fox

     On Thursday, October 31, 2013 8:42 PM, Michael McCrae
<mmccrae6 at cox.net> wrote:
    Frankly, it's when the water fails that the seats come out.....ask
me how I know that my tank suddenly went dry....GGGG!

mike McCrae

> From: vairologist at cox.net
> To: virtualvairs at corvair.org
> Date: Thu, 31 Oct 2013 19:14:01 -0400
> Subject: <VV> Wintrer Projects
>
> Smitty says;   As I was writing about my ongoing trials with Spike I was thinking about a related issue.  When I wrote to one of my
 friends about loosning a valve seat he suggested that I might look to
the water injection for a reason for that to happen.  The shock of
moisture laden air cooling the seat and making it fall out.  Don’t
know if I can relate to that or not. Warren let me hear your opinion
along with that of others who have water injection experience.
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