water injection

[Greg Hermann]

>On Mon, 31 Jan 2000 13:40:46 -0800, you wrote:
>
>>With care, some before the turbo can be very effective and perhaps the
>>simplest--
>
>True, since you don't need a manifold-referenced regulator.
>In fact, can't you use the boost pressure to build up
>pressure in the water tank and thus have automatic rising
>injection rate?
>
>I have seen discussion of this subject before and there was
>some concern over water droplets causing erosion of the
>compressor blades when it's wound up to 100,000 rpm or so.
>Any comments?

I think very fine atomization is the key to avoiding this as well, that
plus only putting enough water in pre-turbo so as not to go past saturation
(with respect to water) at the turbo outlet volume flow/temp conditions.
And, remember--the pre-turbo water will lower the turbo compressoor outlet
temp considerably. How much water to use here can be calculated.

For fine atomization of pre-turbo water, enough pressure is going to be
necessary to make "boost referencing" it, or using boost pressure to boost
the pump about irrelevant. You will likely need at least 250--300 psi water
pressure, or else compressed air atomization at the nozzle, to get it as
fine as it ought to be.

Greg
>
>-Charles
>'81 BMW 745i currently knock-limited to 15 psi boost
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