Water Sprayer to control Water temps
Whats up guys!
Just wanted to share a video I made on my Water sprayer set up. Sprays the Radiator and Intercooler. All controlled by the ECU now..but when I made the Video I had it on a switch. Check it out! |
Cool, Evos and STI 's came with those from the factory
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The previous owner of my Cosmo set up a water sprayer for it. It's spraying the oil cooler and intercooler. Its all run through the windshield washer sprayer. Very effective.
I like that yours is controlled through the ECU. Do you have it set up to spray once it reaches a certain temp? Or rpm? |
Originally Posted by mannykiller
(Post 12212303)
Whats up guys!
Just wanted to share a video I made on my Water sprayer set up. Sprays the Radiator and Intercooler. All controlled by the ECU now..but when I made the Video I had it on a switch. Check it out! https://www.youtube.com/watch?v=9bs4B90S7S4
Originally Posted by street-heat7
(Post 12212394)
The previous owner of my Cosmo set up a water sprayer for it. It's spraying the oil cooler and intercooler. Its all run through the windshield washer sprayer. Very effective.
I like that yours is controlled through the ECU. Do you have it set up to spray once it reaches a certain temp? Or rpm? What results are you guys seeing? How fast do temps drop? how significant is the temp drop? |
One trick you can do is make your water reservoir metal and put it in the engine bay where the water will get hot.
It is the latent heat of evaporation that cools the heat exchangers, so the faster the water evaporates the more water you can spray on to evaporate. The more evaporation you can get over a given length of time the more cooling. I experimented with this at the local hillclimb. Pretty crazy that spraying hot water on a hot intercooler instantly results in cool to the touch intercooler. |
What results are you guys seeing? How fast do temps drop? how significant is the temp drop? I can't give you any numbers, but if the water is hot it cools the intercooler down after a run from way to hot to touch (running 26psi boost) to cold to the touch in about 10 seconds of spraying/waiting. Normally I rob the coolers of ice water to refill my sprayer and it cools much slower with ice cold water, but it is nicer to cool myself off with. |
Originally Posted by KNONFS
(Post 12212406)
What results are you guys seeing? How fast do temps drop? how significant is the temp drop?
I'd say after pulling the sprayer, after about 6 seconds I see temps either level off of start to go down. I believe if it 'misted' better (like Blue is alluding to) those results would be much better/faster. This thread has me curious now though, I'd like to do a pull under boost and see what happens with temps and boost pressure. |
Originally Posted by BLUE TII
(Post 12212441)
I just use a garden sprayer, but the results are incredible.
I can't give you any numbers, but if the water is hot it cools the intercooler down after a run from way to hot to touch (running 26psi boost) to cold to the touch in about 10 seconds of spraying/waiting. Normally I rob the coolers of ice water to refill my sprayer and it cools much slower with ice cold water, but it is nicer to cool myself off with. |
Originally Posted by KNONFS
(Post 12212406)
What results are you guys seeing? How fast do temps drop? how significant is the temp drop?
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Originally Posted by BLUE TII
(Post 12212437)
One trick you can do is make your water reservoir metal and put it in the engine bay where the water will get hot.
It is the latent heat of evaporation that cools the heat exchangers, so the faster the water evaporates the more water you can spray on to evaporate. The more evaporation you can get over a given length of time the more cooling. I experimented with this at the local hillclimb. Pretty crazy that spraying hot water on a hot intercooler instantly results in cool to the touch intercooler. I really didn't like the idea of anything else metal in the engine bay. As is it's already pretty cluttered. And I've got a pretty straight forward set up. You may be right regarding the cooling. But whats the adverse affect of putting more Heat soaking material in the engine bay? Yes maybe it's cooling a bit more...but then maybe it's also causing more heat soak and making heat harder to get rid of due to the clutter of area. Also, if you put a metal tank in the engine bay... it might be kind of difficult to open after a hot lap. Anywhere but the engine bay means, it won't be hot to the touch. :icon_tup: |
Anywhere along the exhaust gets pretty warm and its the lowest point in the car (bonus).
Put just the fill in the bay, bins, fender arch or wherever you can get to it easily. |
Originally Posted by BLUE TII
(Post 12212441)
I just use a garden sprayer, but the results are incredible.
I can't give you any numbers, but if the water is hot it cools the intercooler down after a run from way to hot to touch (running 26psi boost) to cold to the touch in about 10 seconds of spraying/waiting. Normally I rob the coolers of ice water to refill my sprayer and it cools much slower with ice cold water, but it is nicer to cool myself off with. Spraying with cold water will only result in less evaporation if the surface of the intercooler is... colder? |
primerGrey It is true that most heat transfer occurs during a phase change (in this case, evaporation), but the idea that spraying with hot water cools more rapidly than spraying with cold water sounds a little odd. Spraying with cold water will only result in less evaporation if the surface of the intercooler is... colder? However, what I am talking about is given the same length of time and unlimited water the hot water cools a surface in less time as more evaporation can take place in a given length of time (it is already near the point of evaporation). In actual practice of cooling a hot intercooler with a garden sprayer this turns out to be very noticeable difference in time to cool with counter intuitive outcome. You spray cold water on the hot IC and it instantly evaporates on the turbo side and more slowly evaporates on the engine side. You spray more cold water on the turbo side and the cold water sprayed on mixes with the warmed water on the cooler engine side and cools it more so it takes even longer to evaporate. You spray hot water on the hot IC and it all evaporates very quickly and you spray more hot water on which evaporates very quickly lingering on the cooler engine side for much shorter time. Also any hot water sprayed on that mixes with hotter water still on the IC about to evaporate does not cool the previous water about to evaporate back down nearly as much so it is able to evaporate sooner. Well, it is a super easy experiment to try- I suggest just doing it for yourself. Very satisfying. |
Is the output of this experiment visual confirmation that hot water evaporates from the surface of the intercooler more quickly than cold, or is there an air temperature probe measuring the actual cooling affect on the air going through the intercooler?
I can certainly believe that hot water evaporates more quickly from the surface. And it would indeed be counter-intuitive if measured air temps dropped more with hot water than cold. |
I have a setup similar to this for my RX7, It sprays the oil coolers and radiator. When I finish rebuilding my engine I'll set it up to spray the intercooler; I will then try the hot water vs cold water theory and post the data. Also the nozzles I purchased creates a very fine mist with a wide spray angle; I do have an external pump located in the engine bay and the windshield fluid as the water source.
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