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Old 08-16-2002, 11:42 AM
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Post Water Injection

I know that water injection in a turbo is a good thing for keeping intake temps down and helps horsepower and gas milage. It also allows you to advance the timing without detonation.

If you put in a water injection system in a non-turbo engine can you advance the timing? If you advance timing it should improve performance but will it improve gas milage? What is the advantage to running more timing?

If you build a simple system and tie it into the ported vacuum that controls the vacuum advance will it affect the timing thus requiring more advance? (I want to build one without pumps and solenoids) I picked this port because I want it to come on when I accellorate but not when I'm idling. Is there another ported vacuum on a Qjet?

My system would only cost a few dollars to build so it is an inexpensive experiment. I would also like the side benefit of the engine running cooler since it runs a 220 now. At least thats what the guage reads.

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Old 08-16-2002, 12:45 PM
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J. C. Whitney catalogs and full page "technical discovery" ads in men's magazines have been selling these wonder water injection systems for 60 or 70 years. Contrary to the claims of conspiriacy in the ads, if it really worked like they said it does, all the car makers would offer it, guaranteed. On supercharged engines, any type of cooling of the compressed air charge is beneficial and water injection is a good way to reduce the sensible heat in the air stream. The heat of compression is doing the work of vaporizing the water. Injecting water in a naturally aspirated engine requires the combustion process to supply the heat of vaporization which probably reduces the peak temperature in the combustion chamber. Like I said B4, if that gave big bendefits, Detroit would be doing it big time.
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Old 08-16-2002, 01:02 PM
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Frankly I don't believe Detroit is out to make the best product, just one they can sell at a profit. Water injection requires that the consumer has to fill the water bottle at every fill up. Most don't want to even check the oil let alone make sure the water bottle if full. Detroit is producing a hands free car for people that can't even change a spark plug (or want to) so this is not something they want to add to the cost of producing a car.

Yes, there have been a lot of JC Whitney type miracle devices but I believe the concept of water injection is a good one. I know it is good for turbos. I wanted to know if there was as great a benefit to "normal" engines. I am not concerned with decarboning here just performance in terms of advancing timing and possibly better fuel economy.
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Old 08-29-2002, 07:43 PM
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Many years ago when my dad was in his early 20 he experimented with many types of water injection systems. He had pretty complicated ones, with vacume advances and regulators. He said it worked pretty well and got better gas milige. My dads freind then then tried it on his sbc. And the engine vapor-locked, I think water injection is a good idea but again i think detriot didnt run with it since most people dont want an extra tank to fill up in the gas-station. Also the problem of the water freezing in the winter. Well anyway if anyone trys this water injection i think it is a great idea just be-ware of vapor lock.
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Old 08-29-2002, 09:39 PM
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stereodud were in NY???
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Old 08-29-2002, 10:53 PM
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My buddies dad had water injection in his 460 Ford 3/4 truck with a monster camper on the back. He was one of those "super wrenches", a mechanic life long. He claimed less detonation, better mileage, less carbon build-up. He drove this rig everywhere, mountains, desert, etc. and never had problems.
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Old 11-11-2002, 09:41 PM
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i have used water injection on a couple of my motors and some on my freinds-one note that is very important if you live anywhere north of georgia is-during the winter mix the water with alcahol in a 75/25 ratio and durring extreme cold mix it 50/50-i watch my freind park his car last year just to come out the next morning and have a busted water bottle. to be honest i have never used one on a forced induction motor but i can say that i will never have a car again with over 9.5:1 comp and it not be water injected.not only does water injection cool the intack charge but it also slows down combustion(the more water the slower the burn)and if properly setup will give a slight increase in power(dont buy it for the power-the power increase is not tha much and to get the increase in power the timing must be set at the most advance possible while at idle with the water on).but the biggest gains are the ability to run a motor that usually needs atleast 103octane on 93 octane and if enuff water is used you can sometimes use 87octane. and about you wanting to ony have it "misting" on excelleration is a good point but i have found that a sbc works alot better if the injection is set up to deliver max water pressure(max-being your orignal baseline setting)at idle and decreases until about 2000rpm where the water is usually not needed any further(unless you have a very high comp motor)---also you said something aboutwanting to build your own system--i dont recomend this-i have been down that road and in disapointment ditched the water injection idea only to learn later that the amount of water injected is proportional to manifold pressure or"map". go to this site-the non turbo system is what i use and for the money know of nothing else as good. WWW.RACETEP.COM--look under "water injection"
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