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

[Tom Jennings <tomj@xxxxxxx>]

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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