turbo and WATer injector
jiipm at sci.fi
Mon Aug 28 10:53:17 EDT 2000
Yep Sam! And how about UK-made Napier Marine engines with
water injection? Specially that huge Napier Deltic not Vee, but in
delta form? Ok that`s past ;-)
Main reasons for water injection were ( are ) mostly: pressurised
intake air cooling and in gas engines to prevent the knocking and
in the diesels ( big ones ) cleaning also the charger.
At `80s we tested an otto engine (2.0 8v with 7.2 compression, 0.7 bar
pressure -stock) giving 145 HP at 5000 rpm. The best results were some
200hp with 1.35bar and water injected. 50% of alcohol and 50% of water
switched on at 0.8 bar, 0.15 liters a minute. No intercoolers and terrible turbo
lag. Water was injected in before the turbo. That 50% of alcohol had two
functions: It could absorb heat better than water and had energy like gas.
( half part of that the gas includes )
Nowadays there are good charge air ( inter or after :) coolers, knock sensors...
so water injection could be usable only at extreme conditions.
Also we tried to use that starting valve for cooling and extra fueling at the boost
and found some potential in that idea. We just couldn`t regulate it well enough at
that time (some `83-`84 ). Worked quite well at max boost in the mid rpm area,
but it enriched too much at the top, when the boost started to decrease.
CIS distributor was 6-cyl type with two lines plugged. Pump delivery (from distributor)
was measured some 1.8l/min.
j-pm `91 cq
>How about injecting water into the manifold instead of fuel. An engineer I
>know has done just this on an old Bedford(Yanks won't know what that is eh
>Phil etc)truck.. This allows him to lean waaaay down and cruise just fine,
>similar things were done in the war too I believe
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