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Date: Fri, 18 Feb 2005 23:33:45 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Water in the fuel
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I used to do that.  I used a regular spray bottle with a trigger like 
you find around your laundry.  You had to get the engine up to over 2000 
rpm or it would quit.  The object was to blow all the carbon and scale 
out of the chamber and clean it up.  The hope (key word here) was that 
when all that scale broke off, it went out the exhaust  rather than 
lodging between the piston and cylinder wall (where it would do a number 
on the block in very short order.  After a while I quit doing it because 
I had no credible evidence it was doing any good, and was afraid of what 
I felt to be serious chance of serious engine damage. 

Water injection is not for the faint hearted.  The B29s in the Pacific 
used it to get off puny airfields like Iwo Jima.  It worked, but only 
because they were in a position to change engines every 50 hrs or so.

Even emulsified (which we can't reliably do) water is a bad thing ... Jim S.

WRJJRS@aol.com wrote:

>Dave,
>In the old days, I'm led to believe they actually added water to the carby
>to clean the carbon deposits - that's water in addition to normal fuel.
>I have never done this but when you think about it, it does sound logical,
>probably get some additional compression as well as the water droplets flash
>to steam.
>Probably a little 2 stroke oil in there as well wouldn't hurt !
>George (down under)
>
>George, 
>I have seen people use a light spray from a garder hose(pipe) to "de-gunk" their piston engines. A balance between clean and hyd-lock is important! Never put in more than the engine can vaporize. (but it can be hard to be sure how much that is.)
>Bill Jepson
>
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