are right!... so its just a constant flow.. hmmm i like.... i like a lot..

typically water injection is only used at WOT, activated by a micro switch. More sophisticated setups also reference boost levels. When activated, flow is constant, and flow rates can be controlled by a variable valve in the pressure supply line, or by the flow rate of the nozzle, or a method of controlling the pump speed.

Some people have the mistaken impression that it suppresses ignition, and thats why it helps contol detonation. Water injection helps control detonation because it is a form of charge cooling. It increases power, and can even provide noticeable improvements on NA cars.

It has other benefits as well, such as preventing and actively breaking down carbon build up in the ports and combustion chambers. This helps maintain optimum performance by removing the build up of carbon on the back of inlet valve that can impede flow, and removing carbon deposits in the combustion chamber that can be hot-spots which cause preignition.

we used water injection on our old turbo A14, and got very good results with a very simple system. The injection nozzle was a fine mist, low pressure irrigation fitting mounted over the secondary barrel of the carb. No pumps were used at all, it relied on the low pressure (suction) created by the turbo and speed of airflow over the nozzle.

that thing in the middle of the manifold is a hobbs pressure switch, which turns the water pump on at a certain level of boost.

yeh injected into the air/fuel mixture?
but how is it done? through a fuel injector in the manifold? hows the injector no wen to let water through?

Sweeet...

That'd be one way to get me to keep an A-series in my car.

Very neat, very neat looks good blown1400 im impressed

does look good. any power figures?

All that on a small port head.

dunno mate, look at the bits of gasket poking out...it seems to have the oval port gasket. it might just be a genuine 1200GX head!

I bet extending the blower drive was a trick. my blower sits forward so my intake runners arent all eqal lengths. ( mind you not all factory inlet manifols are equal lengths so Im not worried)
I like it , I like it lots.

Not to many bolts on that manifold top side

Hey thanks lads. A dude up in Darwin did most of the fabrication work for the inlet manifold and convinced me to go for the water injection.

Don't know if anyone noticed the swollen water pipe for the water injection??? I forgot that the water pump is putting out 35psi and the hose can only really handle about 15psi- will let go one day and I will replace it with fuel hose...

Power is around 120 hp at the wheels...

can u tell me what the thing in the middle of the inlet manifold is for? boost gauge maybe???

Many people modify oval port heads with center bolt intake mount holes (at least in Japan) as it's said to have better sealing. Mine is:

no not the extra bolt, the thing with the three vacuum lines, and the wires in the back tapped into the plenum ????

I was replying to holeshot... I think that's his water injection.

sorry for bringing an old post up,
but how does the water injection work?

woodydat i know nothing and i can tell you this. ask google

rallycars.com's explanation is here

on the link it says Quote: i guess this means to avoid detonation at the wrong time.


anyway very nice setup there blown1400

wowzas! i neva thought it actually injected water in to the fuel air mixture
i did a few searches on google on what runs the injection but couldnt find much? what runs it is it like a computer or a litle motor manual turned on or what? what kind of injexctors are used etc? what kinda mialeage do u get from the water