John Gotschall wrote:
Has anyone here operated such a a system?
------------------
I've run water injection on various things over the years, especially in
my 2110cc Karmann Ghia while my wife was stationed in Las Vegas. I
installed it out there due to the heat. The high compression and crazy
ambient heat levels led to detonation in the cylinders, so I cobbled up
a vacuum switch-operated system that sprayed a fine jet down each of the
four throats of the two Weber carburetors. It was activated
automatically whenever the averaged intake vacuum dropped to a point
near wide-open throttle operations. I had a vacuum gauge in the panel
so I knew when it was going to flow and when it wasn't, along with a
bright amber LED on the panel....fed by the 12V to the pump. A
wonderful side effect of this system was when I tore the engine down (I
forget why), the combustion chambers looked like they'd just come out of
the box! Clean as could be. I was a VW mechanic at Prestige Motor Cars
in Vegas, waiting for my first wife to finish up her Air Force hitch so
we could start school at Auburn.
Later, I flew with water injection on N56ML, just to keep the combustion
chambers clean. For that job, I'd just switch it on at cruise and let
the cleaning magic happen, and did this several times a year, just out
of general principle. I used the two primer ports as the injection
sites, and it worked great! There was a slight RPM drop while it was
"injecting", but not enough to worry about. Head temps dropped, for
obvious reasons. I got that complete system online.....it had something
like an IV bag that I filled with water and hung from a knob or similar.
I really don't have enough of a problem on 1JF's engine to bother with
that now. I fly it so lean there's nothing to deposit on the chambers.
The plugs come out very light, with virtually no deposits. The
Ellison's awesome spray-bar fuel distribution allows a LOT of leaning,
and some truly amazing fuel economy. Being a very slippery lightweight
KR with a lightweight pilot doesn't hurt either, I guess....
Mark Langford
m...@n56ml.com
http://www.n56ml.com
Huntsville, AL
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