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Simple layout description. (historic document) new page www.nitrous.info
A tank or cylinder of liquid Nitrous Oxide gas as a liquid at its natural 800psi vapour pressure is connected to a valve (or solenoid) that is turned on by a 12v supply as needed. This is fed into the inlet tract. Flow rate is controlled by a brass jet of the desired size to give the amount of boost or rather extra power you require.
In addition to the Nitrous Oxide extra fuel is also required. This is done by "tapping" into the existing fuel supply, or adding an extra pump or whatever and controlled by a similar solenoid valve to the nitrous one, which is operated at the same time. The correct amount of fuel is metered in a similar way to the Nitrous Oxide too, with a small brass jet.
So now we have an arrangement that can fire fuel, as well as Nitrous Oxide directly into the inlet tract. Because we have some restriction jets we can control how much of each.
How it works
If we simply add extra fuel to an engines inlet tract (at the throttle body, after a carb(s) etc) or even by fitting bigger jets to the existing carbs, we get an over rich fuel mixture and less power! That's good. Now we can actually burn this extra fuel if the engine can get more oxygen! Well now it can! If we add some liquid nitrous oxide to the inlet tract, the stuff breaks down inside the cylinder due to temperature (560degrees) into 36 percent Oxygen! This extra oxygen can then burn the extra fuel giving a power increase.
Other benefits include a charge cooling effect which further improves power as the intake charge is much more dense.