At 04:06 PM 1/12/2002 -0500, you wrote: >I know W.I. is supposed to increase power. Here is how it works. Fine droplets of water are injected (kind'o like a carburetor sprays the fuel) and as these evaporate, the charge cooling effect improves volumetric efficiency (VE). However, the real advantage is on heavily supercharged engines where the intake manifold is real hot! We are talking about 150-200F here. That ensures that the water will evaporate before the intake valve closes. Otherwise, there is no VE improvement and thus no direct torque benefit. WI on a naturally aspirated engine with cooler charge may not have that much improvement in VE and torque. The second advantage of WI is it drops peak cylinder temperatures and decreases/delays knock. This could allow more boost pressure or spark advance or lower grade gas. >Can it also improve gas mileage? Nope! >Are there any disadvantages I should know about like extra engine wear? If used ONLY at WOT it should make little difference in engine wear. If you use it continuesly, it would increase corrosive wear. >Could it would work with a propane powered car? I don't think it would do much with a propane car. The best you can do to a propane car is add a supercharger! Side note: The British Spitfire did not use WI. The Rolls Royce two stage centrifugal blower with intercoolers between the two stages and after the blower made an excellent system that did not need WI as much(it was estimated that the supercharger drive on the RR Merlin required ~400 hp to drive from the crank of the 27 liter aero-engine). The Germans and Americans used WI quite extensively... The Germans also used NOs D^2