So one could run a leaner mixture and/or more boost on a humid day in
Florida vs a dry day in Arizona, all else being equal? I didn't
realize water vapor had that much of an effect on knock resistance.
Thanks,
Russ
There are 10 types of people, those who understand binary and those
who don't.
On Apr 29, 2008, at 9:09 AM, Bill Cardell wrote:
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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