| PCRI Product
Evaluation
ACI Sub Zero Four Stage Expansion Chamber
The Sub Zero Four Stage expansion chamber is manufactured by
Air Concepts Industries (ACI) of Fontana,
California. The Sub Zero vertical expansion chamber is designed to work with
virtually any paintgun that has a vertical asa (air source adapter). The
suggested retail price of the ACI Sub Zero expansion chamber is
Design/Construction:
The Sub Zero expansion chamber is three and one-half inches in length (not
including the adapter threads) and weighs about eight ounces. The entire
unit is manufactured from aluminum (as far as we can tell) and the main housing
is a nodized polished black. Internally the Sub Zero expansion chamber contains
two o-rings (plus one on the adapter threads externally). There are standard
1/8" n.p.t. in and out ports to run your lines to.
Design/Construction rating (4)
Performance/Versatility:
We used the Sub Zero expansion chamber on a Spyder semi-auto and found the
following:
Velocity Consistency: All velocity consistency testing was done using
a regular gas twenty-ounce C02 tank. Read from right to left.
With the Sub Zero expansion chamber
A sample of what we've found...
282 fps 284 fps 283 fps
286 fps 288 fps 285 fps
286 fps 285 fps 282 fps
285 fps 285 fps 286 fps
average fps 285 fps
low fps 282 fps (-3 fps)
high fps 288 fps (+3 fps)
Without the expansion chamber
287 fps 285 fps 291 fps
286 fps 281 fps 288 fps
292 fps 291 fps 290 fps
294 fps 283 fps 289 fps
average fps 288 fps
low fps 281 fps (-7 fps)
high fps 294 fps (+6 fps)
Observations: The ACI expansion chamber definitely improved the shot
to shot consistency of the Spyder compared to the stock gun. We also noticed
that when dry firing the Spyder with the barrel pointed towards the ground
(with no paint) that without the expansion chamber it took 12 shots to draw
liquid C02 into the gun. With the expansion chamber it took more than 30
shots to draw liquid.
Performance/Versatility rating (4)
Price:
The Sub Zero Four Stage expansion chamber is priced at $39.95, which is toward
the lower end of the pricing spectrum. This is a very good value.
Price rating (3)
Conclusion:
The Sub Zero Four Stage expansion chamber from ACI does exactly what it's
supposed to do. It helps prevent liquid C02 from entering your paintgun.
The Sub Zero expansion chamber is a very good product at a very fair price.
PCRI IS PLEASED TO AWARD THE ACI SUB ZERO FOUR STAGE EXPANSION CHAMBER
OUR FOUR STAR SEAL OF QUALITY. |
