REFLECTOR: Water Injection

Fri Dec 9 16:51:27 CST 2011

In a water injection system, water is injected into the air going into the
intake usually ahead of the throttle body. It is vaporized thus cooling the
intake charge. The vaporized water passes through the combustion chamber and
out the exhaust. The crank case never sees an appreciable amount of water.
This is fairly common on turbocharged high performance automotive engines.

Grover McNair

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brian Michalk
Sent: Friday, December 09, 2011 2:13 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Water Injection

Ah.  In that case, I think it's a really cool idea.

I actually have another idea that is very risky, bordering on the insane,
that would be used to cool oil temperatures.

During the normal combustion of fuel, the byproducts are CO2 and water.
Now, a portion of that water makes it into our oil, where it is boiled off
when the engine reaches operating temperature.  So, if there's already water
in the oil, how bad could it be to add a little bit more?

The idea would be to have a really high pressure water injection system,
let's say 2,000 PSI, with an atomizing nozzle that is able to deliver
droplets in the micron range.  If this nozzle were installed to the crank
cover (the Franklin has one) at the top of the engine, the water should
never actually make contact with the engine oil.  It should instantly flash
to vapor, consuming heat in the process, and then get ejected out the
crankcase ventilating tube.  I suppose an alternate solution would be a
cover specially made into a water jacket that sacrifices water boiling to
the atmosphere, allowing the heat to be removed that way.

Actually, now that I think about it compared to conventional water
injection, it's probably no more hazardous than squirting it into the hot
side of the cylinder.  In my case, it would be nice to be able to sit on the
taxiway without having to worry about overheating before takeoff.  For your
case, you need it to cool in flight.

I don't recall; did you ever try retarding your timing to see if that
helped?

On 12/9/2011 12:57 PM, Mark Magee wrote: 

Plane flying. Getting hot. I posted a month ago about my over temp issues.

Mark B. Magee 

Sent from IPhone 4

On Dec 9, 2011, at 12:53 PM, Brian Michalk <michalk at awpi.com> wrote:

I think a better benefit would be as an octane booster.  Perhaps you would
even be able to run mogas in your IO540.

It's all theoretical at this point, whether it's in a Velocity or racer.
How practical would it be?  Perhaps its best to play with water injection
after you are flying the plane?

On 12/8/2011 8:13 PM, Mark Magee wrote: 

All,
I am pondering whether it is worth considering installing a computer
controlled water/ water/methanol injector on my IO540 angle valve purely for
CHT reduction. I have used them in the past in autos with good effect, and
studied their uses in other applications. The numbers these
http://www.alcoholinjectionsystems.com/Naturally-Aspirated-Kits/c25/index.ht
ml folks post are in line with what water injectors can achieve from my past
experience. Anyone used one on a Velocity/Canard/Flying aircraft?
>From my initial calculations less than 2 gallons of water would climb a WOT
300 HP Velocity from sea level to over 12,000 MSL and then wouldn't be
needed for descent in all liklihood. So a 6 gallon tank (in the keel?) would
easily handle a long cross country. In cold weather 50/50 water methanol I
would think preclude induction icing, but you could always just turn it off
it it was cold enough and you didn't need it.
Just a thought, I am experimental :)
They were OEM on turboed and supercharged aircraft in WWII. Thoughts?

Mark Magee
N34XL XL FG 300HP
Brady TX 

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