dilley
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| posted on 27/3/07 at 08:35 AM |
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Water injection
Im thinking of fitting water injection but my knowledge on the subject is a bit thin........
Is it worth fitting??what do you think/would do??
can I damage my engine if not setup correctly? will I need another rolling road session and how do yo know what jet to fit?????
Thanks
Dilley.
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RazMan
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| posted on 27/3/07 at 08:42 AM |
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Here's a good setup ...
.... or am I on the wrong track?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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smart51
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| posted on 27/3/07 at 08:44 AM |
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too much water and the engine will have trouble compressing it, bending conrods and things.
Haw are you going to do it? two fuel injectors or a fuel injectors for the water plus carbs for the fuel? Single water injector in the manifold plus
ordinary fuelling?
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dilley
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| posted on 27/3/07 at 08:56 AM |
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Im not too sure, im running carbs, so I assume 1 injector in the plenum or inlet hose??
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BenB
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| posted on 27/3/07 at 08:58 AM |
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Yup. Hydraulic lock is a distinct possibility.
The main problem with water injection though in most cases is the amount of water required (added weight)...
It's also expensive, and you only get extra power because it allows you to remove some of the limiting factors which are preventing you from
making more power (ie retarded timing etc). Often better to concentrate on getting a cool inlet charge, sorting out under-bonnet temperatures etc
etc....
If you're looking at wringing out the last 1% out of your engine in an already pretty max'ed out set-up and don't mind filling up
reasonably frequently with water then fair enough but most of the time it's not worth it.... That's what I've read anyway- might be
wrong!!!!!
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dilley
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| posted on 27/3/07 at 09:00 AM |
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Not needing any more power!!!!just want a way to reduce intake temp if I need to,and maybe take a little stress out of the engine.
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goodall
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| posted on 27/3/07 at 09:04 AM |
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could you not use some kind of condenser like steam trains use on the exhaust port of the piston, ie on the exhaust, would mean less filling up with
water
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worX
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| posted on 27/3/07 at 09:04 AM |
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I don't know everything about this, but I am currently reading "Maximum Boost" By Corky Bell, I thought I would comment:
He does say that water injection is not the preferred method, and really is only used as a last resort...
If you want to Dilley, I will scan the section on water cooling and post it here/mail it to you?
cheers,
Steve.
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dilley
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| posted on 27/3/07 at 09:07 AM |
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Yes please that would be great, maybe woth posting on here if possible so other people can see if interested..
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worX
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| posted on 27/3/07 at 09:11 AM |
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It's in work at the moment (I'm back in Thursday night) as thats the only time I get to read nowadays - (yes yes yes, it is quality to ge
tpaid to read!) so I'll try and scan it friday for you if thats ok?
I'll post it here/U2U you when I've done it...
cheers,
Steve
quote:
Originally posted by dilley
Yes please that would be great, maybe woth posting on here if possible so other people can see if interested..
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Mr Whippy
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| posted on 27/3/07 at 09:28 AM |
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What about an intercooler even without a turbo if you spray water on that it will chill the air going through it.
I think water injection was used on WWII fighters like the spit & mustang and had rather a bad effect on the engines sometimes. A last ditch get
the F out off there resort
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RazMan
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| posted on 27/3/07 at 09:29 AM |
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If you just want to reduce intake temps then a ducted cold air feed is a good start.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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dilley
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| posted on 27/3/07 at 09:42 AM |
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Im running an intercooler, problem is its under the bonnet in front of the drivers side bulk head laying almost flat and tight to the underside of the
bonnet, I have fitted a scoop over the top, My main concern is wher the air goes once through the inter cooler, I cant really duct/ put a shield round
it.
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Ivan
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| posted on 27/3/07 at 09:50 AM |
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Hi - water injection with 50% methenol is the way to go if you are running turbo's at high boost and experiencing detonation.
A couple of things to look out for is -
1/ Water droplets must be really fine
2/ pump must be fed through ignition to prevent any chance of it pumpig water into engine when engine not running
3/ make absolutely sure theres no chance of siphonage
Weight is not a big problem as you only need it at full boost so 2 - 3 litres is ample unless of course you're racing as with a truly powerful
turbo motor on thpublic roads you are only ever on full boost for a max of 5-7 seconds a time by which time you are flying and highly illegal
Most importantly - its better to have efficient charge cooling than water injection so sort that first.
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bimbleuk
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| posted on 27/3/07 at 09:51 AM |
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Don't expect water injection to increase power alone as already mentioned its more effectively used to control detonation. The water replaces
fuel which would normally be used to cool the combustion process. As water absorbs something like 6 times more latent heat when vaporized as a side
effect you maybe able to run a more spark advance or maybe an extra PSI ot two of boost.
Ideally you want a programmable system to control the amount and duration of the water injection. Its quite easy to add more water than you need and
not see any adverse effects until something goes pop!
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Mr Whippy
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| posted on 27/3/07 at 09:52 AM |
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quote:
Originally posted by RazMan
If you just want to reduce intake temps then a ducted cold air feed is a good start.
An auto or manual valve to let heated air in from around the exhaust is a good idea to combat carb freezing. Like I said a wet intercooler will
actually reduce the air temp below ambiant air temp, great on a hot day when the roads giving off loads of heat
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dilley
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| posted on 27/3/07 at 10:05 AM |
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so your saying spray the inter cooler with water externaly??
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RazMan
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| posted on 27/3/07 at 10:17 AM |
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Spraying the intercooler is a common trick as it doesn't require any changes in jetting etc and simply brings down the charge temps by simple
evaporation.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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dilley
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| posted on 27/3/07 at 10:18 AM |
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any ideas on how to do this?
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Ivan
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| posted on 27/3/07 at 10:30 AM |
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quote:
Originally posted by RazMan
Spraying the intercooler is a common trick as it doesn't require any changes in jetting etc and simply brings down the charge temps by simple
evaporation.
Just don't wet the road in front of the tyres   
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RazMan
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| posted on 27/3/07 at 10:31 AM |
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I used to use some washer jets (the type that atomise the water) aimed at the intercooler. This was connected to a small water pump with a manual
switch on the dash - or you could connect a thermal switch somewhere to control it properly.
I just used to push the switch before going up the strip at Santa Pod to help with heat soak.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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dilley
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| posted on 27/3/07 at 10:33 AM |
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did you monitor intake temp with and without the jets to see the results??
My next problem is monitoring intake temp because I haven't a clue what its doing!!!
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worX
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| posted on 27/3/07 at 10:34 AM |
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quote:
Originally posted by dilley
any ideas on how to do this?
just the first one I found...
http://www.turbobits.co.uk/acatalog/elabtronics_intelligent_intercooler_water_spray.html
Steve
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Mr Whippy
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| posted on 27/3/07 at 10:44 AM |
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quote:
Originally posted by dilley
so your saying spray the inter cooler with water externaly??
yip my mates scoobi does this with little spray nozzels above the matrix and has a little water bottle. He has a button to press (oh how they like
their buttons...) and goes by the charge temp gauge.
And yes you can see it work very quickly as it happens.
[Edited on 27/3/07 by Mr Whippy]
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dilley
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| posted on 27/3/07 at 10:51 AM |
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any ideas where I can find a charge temp gauge and sender???
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