Water Injection

We all know that inducing a fine spray of water into the inlet manifold can aid in performance i.e. causing the air to be denser for better combustion and cooler running, but how much water is too much.

The reason why i ask this is because, i was fooly around with somwe parts i had left over from my previous car and come up with an idea. Basically, ive created my own home made water injection kit, and wanted to know what you guys think, would it work or not?

The parts ive used are basic, a fuel pump and an injector. Basically, ive wired up an injector to the same power supply as the fuel pump, so when 12 volts is put into it, the pump runs and simultaniously opens the injector. The pump was then submerced in a becker of water. Ive enclosed some pics of the finished result.

Do you think that this could be modified to fit onto the intake system i.e. behind the air filter, to spray water into the inlet manifold, where it is then distributed along with the air.

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Originally posted by P11GT
We all know that inducing a fine spray of water into the inlet manifold can aid in performance i.e. causing the air to be denser for better combustion and cooler running, but how much water is too much.


A proper water injection set-up works well for a turbocharged engine because it significantly reduces the detonation threshold to the point that additional boost can be run.

It will decrease power in a NA engine because it will displace the fuel air mixture.

there is a product on the market that is a very basic water bottle which attaches to the vacuum pipe and induces a fine spray of water into the inlet manifold. I cant find the site just now, but its supposed to be benifitial to the car, even non turbos, aiding fuel economy.

i was thinking of wiring up a micro switch to the throttle so that it would only work on full, something along the same lines as a NOZ kit. My main concern is like you say, water could collect, and too much could hydrolock the engine. The only other option, is to find a smaller injector or some sort of nozzle which produces a finer spray of water.

Originally posted by P11GT
there is a product on the market that is a very basic water bottle which attaches to the vacuum pipe and induces a fine spray of water into the inlet manifold. I cant find the site just now, but its supposed to be benifitial to the car, even non turbos, aiding fuel economy.


Im sure the site is www.invoauto.co.uk but cant seem to access it. The product is called the Vapour Jet.

I don't think you have to worry about hydrolocking your engine with such a spray system. Hell, I think your car would run like crap well before you would hydrolock it.

I wouldn't trust those telling you it would work with a NA engine. With a boosted engine, you don't have the same limiting factors as with a NA engine. The NA engine will only draw in so much air/fuel, and in this case, water. With the boosted engine, you can just keep adding air and fuel, so the water doesn't displace anything.

Make sense?

I would say if you think it would work install it and do some dyno'ing to test it. I know it will benefit a turbo car. But for an NA car..? You're being innovative at this point. :)