[Diy_efi] Water Injection (Injector Position) the Cosworth way
Axel Rietschin
Axel_Rietschin at compuserve.com
Sun Jan 12 15:15:37 GMT 2003
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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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<DIV><FONT face=3DArial size=3D2>I went to the Autosport show in =
Birmingham, UK last=20
week and had a chance to examine a 2001-spec 2L Zetec Turbo =
engine, as=20
built by Cosworth Racing for the Ford Focus World Rally =
Car.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>On this particular engine there is =
four water=20
injectors, one per cylinder, on the bottom side of the inlet=20
manifold, below and after the throttle barrel (litterally 3 cm from =
the=20
head as the engine has port throttles) - so we are talking port =
water=20
injection.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>They use Weber IWF2 injectors with a =
"water rail",=20
identical to a fuel rail, and the rail has four very tiny sensors - =
one for=20
each injector. From the Weber datasheets, those injectors operate =
at a=20
nominal fluid pressure of 1000 KPa which gives some clue at the =
water=20
pressure they might use.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>On top of the engine there is a small =
carbon fibre=20
electrical dispatch box where all the engine connectors =
are=20
grouped into two larger connectors going to the ECU (they use =
Deutsch AS=20
connectors all around). The plugs coming from the lower =
rail injectors=20
and sensors are labelled "H2O INJ" and "WP-1" to "WP-4",=20
respectively, which I tentatively expand to Water Pressure. They =
probably=20
use sequential water injection (the ECU they use certainly has this =
capability)=20
and I'm willing to bet for open valve injection timing - this would =
put the=20
cooling where it belongs, with minimal oxygen displacement.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>As a side note, there is a "KNOCK" loom =
going near=20
the spark coils & plugs (they probably use the NTK or Kistler =
pressure=20
washers) and also an "UEGO" connector on the dispatch box, which hints =
they may=20
use WB-O2 on the actual race cars. The engine has =
redundant crank=20
sensors and throttle position sensors, the throttle barrel id =
actuated by a=20
small electric motor.</FONT></DIV></BODY></HTML>
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