Fw: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...

[Strasser]

I too am considering this as a mileage enhancement.  I would have to discuss
the potential gains for increasing the water input rate above that which is
required for stopping detonation.  Since the engine utilizes such a small
fraction of usable mechanical energy from the combustion of fuel, alot
escapes the exhaust (among other places...)  By injecting more water, the
normally-wasted heat energy is utilized to induce a phase change in the
water from liquid to vapor, which obviously raises combustion chamber
pressures since water (at STP) expands by a factor of ~ 1400 when
evaporated.  Obviously, there is some optimum point here, since the
existence of water molecules in the chamber impedes radical electron
transfer processes and drops temperatures (hence the impact on detonation).
not sure where that optimum is....comments from all?


Wayne Strasser
Chemical Engineer
EFI Patent Pending

-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, April 30, 1998 4:15 PM
Subject: Re: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...


From: Danny Barrett <danny_tb at postoffice.utas.edu.au>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Subject: RE: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...


>I hope you didn't bite while you were writing this... Your tongue was
>obviously firmly planted in your cheek. As for what it has to do with
>injection... Nothing, except for the original email message (this is about
a
>fifth or sixth generation reply, and the stuff about EFI have gradually
been removed as

>build a simple "home made" water injection system, and how much water
should
>I use? Can I simply splice another injector into an injector control line
>(in parallel), and use another fuel pump to pressurise the water?
>
>Danny Barrett.
>
>
I beleive Sir Harry Ricard used 30-50% of fuel volume as a norm.
(this figure may have been primarily for turbo/supercharged appl).
Lots of folks have used a windshield washer tank/motor as a
dispenser (use a check valve so low manifold vacuum doesn't
draw it out).  Also anything more than just enough to get rid of the
detonation is a waste of fluid.  No real gains past that.  Might
be more info in archives, about this.  ie injector types methods.
Cheers
Bruce