Holley 02121NOS - Manual (Page 8)

Figure 2 Nitrous Bottle Siphon Tube Orientation Figure 3 Nitrous Bottle Mounting Orientations
2.2 Bottle Orientation
Bottle placement is critical to the performance of your NOS nitrous system. It is important to understand how the bottle valve
and siphon tube are assembled to properly orient the bottle in your vehicle and ensure that it picks up liquid nitrous while
undergoing acceleration. All NOS nitrous bottles are assembled so that the bottom of the siphon tube is at the bottom of the
bottle and opposite the bottle label (Figure 2).
Whenever the bottle is mounted in a lay-down position, the valve handle must be towards the front of the vehicle with the label
facing up (Figure 3A).
If the bottle is mounted vertically, the valve handle and label must face toward the front of the vehicle (Figure 3B). This
orientation will position the siphon tube at the back of the bottle where the liquid N
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O will be during acceleration.
WARNING! DO NOT attempt to remove the siphon tube without completely emptying the bottle of all nitrous and
pressure. Failure to completely empty the bottle will result in an explosive condition causing injury or
death.
A bottle mounted upside-down must have the siphon tube removed before use (Figure 3C). Non-siphon bottles can be specially
ordered from NOS.
If the bottle must be mounted parallel to the axles of the vehicle (sideways), the valve handle and label must be angled at
approximately 45° toward the front of the vehicle (Figure 3D). This orientation will position the siphon tube toward the rear of the
bottle.
NOTE: When using a bottle with a siphon tube, the tall bracket should be at the valve end of the bottle and the short bracket at
the bottom (Figure 3E).
The most efficient mounting is the lay-down position (Figure 3A) with the valve handle toward the front of the vehicle. This
position allows the greatest amount of liquid to be used before the siphon tube begins to pick up gaseous nitrous oxide.
2.3 Bottle Installation
After you have determined the location and orientation of the nitrous bottle, use the following procedure to install the bottle:
NOTE: Numbers in parentheses ( ) refer to the parts list / assembly drawing number for the component. Figure 4 shows the
installation assembly for the Universal Wet NOS system.
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