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An investment of a few hours during tube bending will pay off in achieving a neat and coordinated plumbing appearance.
The NOS nitrous pro fogger kit we installed features soft-plume-type fogger nozzles. In this view, the top inlet (in line with the discharge nozzle tube) is for extra fuel. The angled inlet is for the nitrous oxide feed. Each inlet port is labeled.
The foggers feature a discharge that’s positioned 90 degrees to the discharge tube. This soft-plume style requires that the outlet orifice faces inboard, toward the combustion chamber.
Because the intake manifold shown in this example did not feature bungs or adequate runner wall thickness to create sufficient threads, aluminum bungs featuring 1/16″ NPT threads were Tig-welded to the runners. Note how each nozzle is threaded into the bungs using a clock position that aims the nozzle outlet orifice directly toward the combustion chambers. In order to ensure this alignment, each nozzle was fully threaded into its bung. After an alignment matchmark was placed on each bung, the bungs were then welded in the proper clock position.
Both nitrous oxide and the required extra fuel supply are governed by individual solenoids. Each is color-coded-red is for fuel and blue is for nitrous.
Before cutting and bending the supplied stainless steel fuel and nitrous lines, be sure to slip the B-nuts and sleeves over the tube first. Here a red fuel line has been readied. Simply form a flare at the nozzle end of the tube and bend the line to the desired shape.
Here a blue nitrous tube is ready for nozzle connection. The tube sleeve features a slight chamfer that engages the backside of the tube flare. The flare seats onto the flare jet and the B-nut captures the assembly together for a leak-free seal.
The fuel (red setup on the left) and nitrous (blue on right) solenoids, distribution blocks and lines are seen here finished and ready for final installation.
Each inlet port of the nozzle requires a flare jet (much like jetting a carb). The NOS kit includes a selection and the manual offers jet combination suggestions based on the engine format.
For this application we fabricated an aluminum mounting bracket that fastens to the manifold and allows pass through for a -6 vacuum fitting to connect to a turbo wastegate. Both solenoids are mounted to this plate. Just for fun, we drilled a series of lightening holes in the plate and painted the plate with a metalflake base, cleared with a satin clearcoat.
This typical wiring connection illustrates the wiring for the solenoids, arming switch and microswitch.
When bending the stainless steel fuel and nitrous tubes, it only makes sense to attempt to achieve a neat and attractive appearance. We positioned the nitrous distribution block underneath the fuel block and formed our nitrous and fuel lines in parallel with each other.
The nitrous oxide bottle is plumbed to the nitrous solenoid via a supplied length of -6 AN stainless braided hose, already equipped with hose ends. An already-installed pressure gauge lets you easily monitor bottle pressure. The blowdown tube can be oriented to suit the in-car bottle mounting position.
This overhead view shows how the fuel and nitrous tubes follow the same bends. When viewed from either end (front-to-rear or rear-to-front), the horizontal runs of the tubes are aligned perfectly, giving the impression of only one set of tubes. It only takes a few more minutes to plan the tube bends and alignment, and the result provides not only function, but a pleasing form as well.
Tags: FOGGER, NITROUS, NITROUS OXIDE, NOS, NOZZLES, PLUMBING
