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I always though a ultrasonic water vaporizer(like an aquarium mist device) immersed in some pure water that was heated by engine coolant under throttle body vacuum would be an interesting way to get water vapor/steam into the combustion chamber. This would allow you to recirculate some thermal energy that would othewise be rejected by the radiator back to the combustion process. The other thing it would allow is cleaner combustion chambers, and associated components-not too mention lean burn and timing flexibility. Also control of the rate of vaporization can be accomplished by controling the vacuum pressure seen by the vaporizing rig.
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 2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat:
http://forums.tdiclub.com/showthread...=306799&page=4
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