[Diy_efi] Water Injection (Injector Position) the Cosworth

[Mike]

Brilliant, thanks for the info, couple of queries,

a. did they leak the approx value for the engine power ?
b. did you see the rpm gauge redline perchance ?
c. I wonder if the water is chilled, peltier device hiding somewhere ?
d. Any idea of the size/capacity of the water tank ?

rgds

mike


At 04:36 PM 1/12/03 +0100, you wrote:
>I went to the Autosport show in Birmingham, UK last week and had a chance to
>examine a 2001-spec 2L Zetec Turbo engine, as built by Cosworth Racing for
>the Ford Focus World Rally Car.
>
>On this particular engine there is four water injectors, one per cylinder,
>on the bottom side of the inlet manifold, below and after the throttle
>barrel (litterally 3 cm from the head as the engine has port throttles) - so
>we are talking port water injection.
>
>They use Weber IWF2 injectors with a "water rail", identical to a fuel rail,
>and the rail has four very tiny sensors - one for each injector. From the
>Weber datasheets, those injectors operate at a nominal fluid pressure of
>1000 KPa which gives some clue at the water pressure they might use.
>
>On top of the engine there is a small carbon fibre electrical dispatch box
>where all the engine connectors are grouped into two larger connectors going
>to the ECU (they use Deutsch AS connectors all around). The plugs coming
>from the lower rail injectors and sensors are labelled "H2O INJ" and "WP-1"
>to "WP-4", respectively, which I tentatively expand to Water Pressure. They
>probably use sequential water injection (the ECU they use certainly has this
>capability) and I'm willing to bet for open valve injection timing - this
>would put the cooling where it belongs, with minimal oxygen displacement.
>
>As a side note, there is a "KNOCK" loom going near the spark coils & plugs
>(they probably use the NTK or Kistler pressure washers) and also an "UEGO"
>connector on the dispatch box, which hints they may use WB-O2 on the actual
>race cars. The engine has redundant crank sensors and throttle position
>sensors, the throttle barrel id actuated by a small electric motor.
>
>
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