Holley 02121NOS - Manual (Page 10)

2. Install the Soft Plume Nozzle (22), taking into account the length of the nitrous and fuel supply hoses and the intended
location of the solenoids. Take into account that the nozzle mounting bung (21) needs to be restrained during final
installation, and accessibility of a tool is important. Make sure the nozzle and feed lines will not interfere with engine
components or accessories and will not interfere with the hood when closed. The nozzle should not move from the
perpendicular position in the air inlet duct due to strain induced by the nitrous and/or fuel supply hose.
3. Remove the air inlet duct.
CAUTION! All debris must be removed from the air inlet duct. Use compressed air, if available. Failure to do so can result in
severe engine damage.
3A. Mounting Surface: Drill a 7/16” hole perpendicular to the inlet duct centerline through the inlet duct. Insert the Soft
Plume nozzle mounting bung (21) into the 7/16” hole with the head inside the duct. Use Loctite or a similar compound
on the nozzle adapter threads and securely tighten the nozzle mounting bung nut (20) to the nozzle mounting bung
(21). This hole should be drilled onto the bottom (towards the underside of the car) of the air intake tube.
CAUTION! Severe engine damage can occur if the nozzle adapter / nozzle assembly works loose from the air inlet duct.
Ensure that the Soft Plume nozzle is securely tightened in the air duct.
4. Note the discharge side of the Soft Plume nozzle. Install the Soft Plume nozzle in the inlet duct with the discharge side
pointed toward the engine (downstream or in the direction of the induced air stream). Use Teflon paste to ensure adequate
sealing.
5. Install the air inlet duct.
Install nozzle
here.
Figure 5 Soft Plume Nozzle Installation Cut-Away & Installation Photo
2.5 Solenoid Mounting
CAUTION: Do not overtighten the vise in the following procedure, or the solenoid will be damaged.
1.
2.
3.
4.
5.
6.
7.
Clamp the nitrous solenoid (6) in a bench vise.
Thread the 1/8” NPT x 4AN nitrous filter fitting (10) into the inlet port of the nitrous solenoid. Use Teflon paste to avoid
leaks.
Thread the 1/8 NPT male end of the blue 2 ft. 3AN hose (17) into the outlet port of the nitrous solenoid. Remove from the
vise.
Clamp the fuel solenoid (7) in a bench vise.
Thread the 1/8” NPT x 4AN Fuel Filter Fitting (11) into the inlet port of the fuel solenoid. Remove from the vise.
Thread the 1/8 NPT male end of the red 2 ft. 3AN hose (18) into the outlet port of the fuel solenoid. Use Teflon paste to
avoid leaks.
Attach the nitrous solenoid to the solenoid mounting bracket (24). Attach the fuel solenoid to the solenoid mounting bracket
(24). See Figure 6.
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