Cool air / Water induction
Submitted: Saturday, Nov 18, 2006 at 11:13
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nissnut
Hi all, Its Sat morning, first coffee of the day and a leisurely read of the posts. What better way to start the day. Came across bandk's query on intercooled turbos and the replies got me wondering. Many years ago I always used to notice, and still do, how
well my old bangers ran on cooler or frostier nights. Cooler air being denser, better power, smoother running etc. However, moisture in the air was a factor according to motor engineers at the time, [60s-70s]. I recall a couple of race car teams and engine builders at the time experimenting with
water injection systems with varying success, however all showed an increase in power. Does anyone remember this reasearch and what eventually happened ? Cheers guys...........nissnut.
Reply By: Member No 1- Saturday, Nov 18, 2006 at 11:33
Saturday, Nov 18, 2006 at 11:33
capa still use with some superchargers to assist cooling
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Reply By: Heefers - Saturday, Nov 18, 2006 at 13:37
Saturday, Nov 18, 2006 at 13:37
G'day guys,
Someone correct me if I'm wrong, but isn't
water injection used to stabilize combustion not to lower intake temp?
Cheers, Heefers
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205608
Follow Up By: sailor1man - Saturday, Nov 18, 2006 at 22:21
Saturday, Nov 18, 2006 at 22:21
Remember it
well. It was used to increase the oxygen content of the air to fuel ratio, thereby improving combustion
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Reply By: Big Woody - Sunday, Nov 19, 2006 at 06:47
Sunday, Nov 19, 2006 at 06:47
I fitted
water injection to a Ford Bronco I had about 18 years ago in an attempt to save fuel.
It made no difference on performance but my fuel consumption went from 9 mpg to 12 mpg which is a 25% reduction.
From memory you have to be careful with the volume of
water going in though as I remember when I had set it too high I got a build up of something on the plugs. Did a lot of
miles in that car and had no problems though.
Cheers,
Brett
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Reply By: Member - Bradley- Sunday, Nov 26, 2006 at 22:46
Sunday, Nov 26, 2006 at 22:46
still used a lot on high performance cars to lower intake temps / reduce detonation etc etc.
Aquamist in the UK make a real good high pressure low volume pump and jets etc.
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Reply By: Member - John R (NSW) - Monday, Nov 27, 2006 at 09:19
Monday, Nov 27, 2006 at 09:19
Water/Methanol injection originated in aircraft engines. When injected into the airflow (before compression), the latent heat of vapourisation drops the temp of the intake air and makes it more dense (as mentioned above). One side advantage is the methanol provides a little extra fuel for combustion.
Water/Meth will usually recover most efficiency losses from operating in a hot environment, but seldom give you "more power" than stock.
Typically, in the last plane I used to fly, we'd only use it for takeoff. For example, a 1 minute burst from start of takeoff roll to about 500' used about 20L of W/M. (We used a 50/50 mix). When you switched it off you'd think an engine had failed!
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