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Water Injectors
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roverdriver



Joined: 18 Oct 2008
Posts: 1167
Location: 100 miles from Melbourne, Victoria, Australia

PostPosted: Fri Nov 14, 2008 10:37 am    Post subject: Water Injectors Reply with quote

Rustyrecks has mentioned a Water Injector in the HHO Fuel Cell thread.

I remember that here in Aus., water injectors were commonplace in the 1950's. Unfortunately I was too young to take a detailed interest in them, but I had the impression that one purpose for fitting one was to assist in the combustion of low octane fuels in engines with a compression more suited to higher octane.

As far as I know, they were all after-market add-ons, however motoring magazines of the period had many adverts for them.

I am very interested in knowing the theory and practice surrounding their use. In spite of what I have said above, I have memories of them being fitted to a wide range of vehicles, from Ford T's to a Vauxhall Wyvern.

Please enlighten me!
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peter scott



Joined: 18 Dec 2007
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Location: Edinburgh

PostPosted: Fri Nov 14, 2008 10:56 am    Post subject: Reply with quote

Is it not a case of cooling the mixture, reducing its volume and you can thereby suck in more.

Peter
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peppiB



Joined: 30 Jun 2008
Posts: 687
Location: Newcastle upon Tyne

PostPosted: Fri Nov 14, 2008 10:57 am    Post subject: Reply with quote

googled it and found this link

http://hackaday.com/2005/06/25/home-built-water-injection/
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47Jag



Joined: 26 Jun 2008
Posts: 1470
Location: Bothwell, Scotland

PostPosted: Fri Nov 14, 2008 11:06 am    Post subject: Reply with quote

Rover,

I recall reading that London Transport had experimented with water injection on their buses. It apparently removes all the carbon from the combustion chamber as well. I tried it on my Austin A70 in the early 60s but had neither skill or knowledge as to how to regulate the flow. I had a pipe from the inlet manifold sucking thru' a small carburettor jet.

Art
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47Jag



Joined: 26 Jun 2008
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Location: Bothwell, Scotland

PostPosted: Fri Nov 14, 2008 11:11 am    Post subject: Reply with quote

Peter,

My understanding was that it increased the volume. This is the reason that engines give more power when it's damp.

Art
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Rick
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Joined: 27 Apr 2005
Posts: 21126
Location: North-west UK

PostPosted: Fri Nov 14, 2008 11:13 am    Post subject: Reply with quote

Is this the same as the water injection option that was available on the Saab 99 turbo in the late 70s?

Rick
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peter scott



Joined: 18 Dec 2007
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Location: Edinburgh

PostPosted: Fri Nov 14, 2008 1:22 pm    Post subject: Reply with quote

47Jag wrote:
Peter,

My understanding was that it increased the volume. This is the reason that engines give more power when it's damp.

Art


I think that without a turbo or superchager the volume remains the same i.e. (at max) the swept volume of the cylinder but if the mixture is cooled then you can get more molecules into the cylinder in a given sweep.

Quote:

Is this the same as the water injection option that was available on the Saab 99 turbo in the late 70s?

Rick


Yes, I think it's all the same game. An intercooler also performs this mixture cooling. In fact is the Saab system not spraying water into the intercooler rather than into the induction stream?

Peter
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Rick
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Joined: 27 Apr 2005
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Location: North-west UK

PostPosted: Fri Nov 14, 2008 1:26 pm    Post subject: Reply with quote

Quote:

Yes, I think it's all the same game. An intercooler also performs this mixture cooling. In fact is the Saab system not spraying water into the intercooler rather than into the induction stream?
Peter


I'm not sure that these first generation Saab turbos had intercoolers at all, ISTR it came in on later H series 16v engines

Rick
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Last edited by Rick on Fri Nov 14, 2008 1:39 pm; edited 1 time in total
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47Jag



Joined: 26 Jun 2008
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Location: Bothwell, Scotland

PostPosted: Fri Nov 14, 2008 1:38 pm    Post subject: Reply with quote

Peter,

Wrong word...... I should have said DENSITY of the charge.

Art
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Jim Walker



Joined: 01 Oct 2008
Posts: 124
Location: Chesterfield, Derbys.

PostPosted: Mon Nov 17, 2008 2:33 pm    Post subject: Reply with quote

I seem to remember that while water injection caused a greater quantity of air to be induced by having an added refrigerating effect caused by the drop in pressure through the carb. venturi, this only caused a weaker mixture because the petrol supplied via the jets remains the same. Some means of richening the fuel supplied is also needed.
If water injection alone increases engine performance the engine was probably running rich anyway.

Jim Walker.
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magic9r



Joined: 13 Dec 2008
Posts: 33

PostPosted: Mon Dec 15, 2008 1:05 am    Post subject: Reply with quote

Do car runs weak on a cold day?
No, they run better because the air is denser and as carburettors are a crude but effective mass flow sensing mixture control, they still work with hotter and colder air within limits, on the cold side at least down to the point where the carb ices.
Nick
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