There are a couple of excellent articles on the autospeed online mag about water injection. It is way more than just cooling the intake charge, the water also acts as an anti-detonant. A small quote from Ricardo's papers from the 30s "At the same time it was noted, that with the addition of water, the influence of steam as an anti-knock allowed of the fuel/air ratio being much reduced.... In fact, with water injection, no appreciable advantage was found from the use of an over-rich fuel/air mixture."
Bill Cardell TurboDog's Dad www.flyinmiata.com 1-800-FLY-MX5S (sales) 970-464-5600 (tech) 2008 FM Open House: August 14-17 ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Russ Sent: Tuesday, April 29, 2008 9:42 AM To: MiataPower List Subject: Re: Question regarding installation of Water Injection kit Interesting. Just looking for a scientific explanation. When water evaporates, it absorbs heat from the surrounding air, cooling that air. This is the benefit of WI: sucking heat out of the air when it changes to a gaseous state. So I don't see the difference between it cooling the air right after the intercooler vs. cooling it a few feet later, besides having more time to evaporate. WI simply acts as a 2nd intercooler. Thanks, Russ There are only three sports: bullfighting, motor racing and mountaineering; all the rest are merely games. - Ernest Hemingway On Apr 29, 2008, at 8:16 AM, Gerry Noble wrote: Having been part of the development of WI for turbo cars, we found the best placement for the nozzle is 15"-20" from the throttle body, this allows the water time to fully atomize before entering the cylinder where it cools the mixture, (which is what WI is suppose to do) and make it denser to give more power. It is not to cool the air, that's the job of the inter cooler ( but that's another story on correct intercooler use and design) Gerry Noble [EMAIL PROTECTED] Life is a great , so live it every day. Life is short , so don't count the days. Kids grow up fast , so don't get old to soon. ----- Original Message ---- From: Russ <[EMAIL PROTECTED]> To: MiataPower <[email protected]> Sent: Monday, April 28, 2008 11:08:03 PM Subject: Re: Question regarding installation of Water Injection kit Why would being closer to the cylinders be best? Obviously, it needs to be after the intercooler so that there's no chance of the water condensing out of the charge in the intercooler. Once out of the intercooler, I'd imagine it wouldn't matter. I like it right after the intercooler so that the water has more time to evaporate. Maybe not an issue, but that's my thinking. Russ ------------------------------------------------------------ at&t: Your World Delivered... to the NSA On Apr 28, 2008, at 7:30 PM, Robert McElwee wrote: I would believe that the proper placement would be as close to the cylinders as possible. Due to installation limitations, I have mine installed in the IC outlet about 3 inches below the TB. On Mon, Apr 28, 2008 at 5:26 PM, Russ <[EMAIL PROTECTED]> wrote: I've heard folks recommend just before the throttle body and other say the intercooler outlet. I placed mine at the IC outlet. Nice thick aluminum there for tapping. :-) -- Robert McElwee and Red Beast 1991 T25 Turbo @ 15 PSI Link ECU, FM IC, 9:1 pistons Over 400 lbs of "added lightness" www.lightweightmiata.com Lightweight Miata Forum: www.lightweightmiata.com/forum The Miata Trailer Project: www.lightweightmiata.com/trailer
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