Re: [Amc-list] Re; Interesting Water Injection for DIY

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

My recollection of aircraft using water or water/methanol injection was for
WEP (war emergency power).
The incoming air/fuel charge is cooled and "condensed" by the injection of
water/methanol to stuff the cylinder with a larger volume of fuel/air for
greater power, the detonation point is also increased. The Germans also used
this method. They called it MW50 or something similar, I believe GM-1
designated the nitrous injection system. Anyway it made the engine develop
greater horsepower for a limited amount of time. I believe the crew kept
track of how much a fighter pilot used the injection system and after so
much use the engine was pulled and replaced, so it didn't "help" the engine
it actually used up the engine faster from my recollection. I'm not really
sure how this translates into turbo equipped car use or the magical water
injection systems of the past that were available for autos.

Armand

----- Original Message ----- 
From: "Tom Jennings" <tomj@xxxxxxx>
To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
Sent: Thursday, August 02, 2007 11:53 AM
Subject: Re: [Amc-list] Re; Interesting Water Injection for DIY


> On Thursday 02 August 2007 07:49:40 Don Johnson wrote:
> > Tom, I think you're off a little in your explanation of the use of water
> > injection. Water injection is used in aircraft to slow the onset of
> > detonation at high boost and power settings. Steam will not increase
> > cylinder pressures over what is obtained by burning gasoline, especially
at
> > high boosts.
>
> I don't recall my source so I'll defer to you here. Somewhere though I
recall
> a discussion of handling wasted heat -- since producing heat to increase
gas
> pressure of course is all the burning gasoline is good for! -- but I could
> have the scale of things off, for starters, or just be plain old wrong
(nahh,
> that never happens :-)
>
> Was W.I. used WITH turbo/supercharging then?
>
> > Water injection slows the burning and avoids detonation which
> > allows more power to be derived from the engines during emergency
> > conditions. I believe water injection was either selected or came in
> > automatically at boost above a certain number of inches of manifold
> > pressure.
>
> For suppressing detonation the amount and timing would be pretty critical.
I
> bet all that aircraft stuff is well-documented somewhere, especially the
old
> stuff. Would be some interesting reading.
>
> Some good things DO get lost!
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