Date: Wed, 22 Dec 1999 16:24:19 GMT
From: NANS <>
Subject: Re: water injection - worth the fuss?

In article <>, (John) wrote: > If you are running loads - and I mean loads of boost then water cools the > charge much better than fuel enritchment and better than the tiny > intercooler on the 900. The 99 did it by a washer jet in the intake and > needed it at 200+ bhp because there was no room for an intercooler. > > john > Water injection was used as far back as the 2nd world War. The germans had used sucessfully for boost performance and when introduced in a finely atomized form cold produce up to 5% for water alone and up to 15% when used with methanol. A word of caution - the fuel must be in the proportion of 10 -15% of the fuel and not as used in the conventional turbo application where turbo boost pressure is used to force the water in. THis is because Boost pressure alone does not indicate actual engine load or fuel use because the waste gate limits or fixes the upper point. At 3000 rpm and at 5000 rpm, WOT the boost pressure would be the same and therefore water injected would be the same. What I am trying to say is that a separate metering system would need to be employed either in the form of a venturi system or a THrottle body injection system for the water. Lab testing has shown that the water increases bmep through the latent heat of evapration and adds power by the effect of steam.Needless to say the engine should be able to burn whatever fuel air mixture and therefore the mixture must not be altered. It would also be possible not to use wastefully rich mixtures for cooling and anti knock purposes.Water injection of this sort can be used in high compression engines and not only on turbos. I am working on my K-jet P1800 volvo and hope to have a functioning unit soon with h2o injection.. Therefore I would conclude that water injection has not been fully exploited because as was earlier pointed out that an additional fluid to fill, although free would be considered a pain! Hope I have been of some help! Good luck! Sent via Before you buy.

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