REFLECTOR: Water Injection

[Brian Michalk]

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 
> <mailto: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.html 
>>> 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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