Re: water injection - Saab Performance Bulletin Board - Saabnet.com
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Re: water injection
Posted by Mikael H. (more from Mikael H.) on Sun, 26 Jun 2005 21:22:43
In Reply to: Re: water injection, dboone, Sun, 26 Jun 2005 17:12:24
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A larger IC is usually always better. The downside is slightly more turbo lag, due to the larger IC volume, the turbo now has to pressureize.
Water injection works by evaporating liquid water mist in the combustion chamber. While it only takes 1 heat calorie to increase the temperature of 1 gram of water by 1 degree Celcius (1.8 F), it takes all of 600 heat calories to evaporate the same amount. All of this heat energy is taken from the surrounding areas in the combustion chamber, thereby cooling it off. This is the underlying reason why water injection is so efficient (the same principle is used in water evaporation fridges in development countries without electric power). The water is injected under high pressure as a very fine mist, much the same way heating oil is injected by an oil furnace. A potential problem with water injection is corrosion of internal engine parts. Also, never inject the water before the IC, as the mist may condensate and form drops.
Saab developed and sold their own water injection system for pre-APC turbo models. I have it installed on a 99T -80. It is a fairly simple system, where the water is injected under low pressure, just before the turbo, using a windshield washer jet. It relies on the fast spinning compressor blades for "pulverizing" the water drops into a fine mist, before entering the engine. It allows you to safely increase the boost on a B-turbo to almost 20 psi, putting out 175 hp.
Mikael H.
posted by 64.230.110...
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