[Diy_efi] water injection

[bearbvd at mindspring.com]

Original Message:
-----------------
From: Klaus Allmendinger klaus at Innovate-tech.com
Date: Wed, 5 Sep 2007 15:02:35 -0700
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] water injection


Why?

Water injection on a gasoline engine is mainly there for knock
supression. A diesel operates on "knock". It lives by compression
ignition, which in a spark ignited engine is the reason for knock. The
only reason I can think of for using port WI on a diesel is for slight
NOx reduction. In a diesel with port WI this results in an increase in
CO and HC emissions and a slight increase in fuel consumption from all
the research papers I read.


BZZZZZZZTTT !!!

First of all, a diesel does NOT operate on 'KNOCK' !!! Detonation will
destroy a diesel absolutely as fast as it will destroy a spark ignition
(Otto cycle) engine.

The burn in a diesel happens as fast as the fuel is EVAPORATED (after
atomization). This is NOT an 'explosive' process, as knock is. This is
PRECISELY why a diesel will destroy itself if fed a fuel which is harder to
ignite (to low a cetane rating) , such as gasoline !!!

WI in the ports of a diesel isn't worth much, but it CAN be EVERY bit as
effective as an intercooler if injected immediately post compressor !!

WI , done properly, as an 'internal coolant' IS an effective knock
suppressant, but it does a LOT more than that. GO READ THE ARCHIVES !!!!!

Greg

- Klaus


-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of ian
Sent: Wednesday, September 05, 2007 2:42 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] water injection

Hi guys.

Im considering adding water injection to my little 1.0 turbo diesel
charade.

has anyone done something similar and has advice?

Im intending to use a washer pump and agricultural (metal) spray nozzle,
with a PWM controller that increases the pump duty cycle based on boost
pressure in the plenum. I was intending to spray directly into the
plenum, so as not to have water interfering with the turbo.

thoughts ?

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