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Velocity Spring Kit?
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universalcode View Drop Down
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Joined: 23 February 2011
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    Posted: 23 February 2011 at 10:52pm
i've got my 98 Custom all taken apart for polishing and i also happen to have a 5-piece Velocity Spring Kit. i purchased it online only so my total would reach a certain price point so i could receive free shipping. so, i'm wondering:

what's the advantage to replacing the stock spring?

why so many choices?

doesn't the existing velocity adjuster work just fine?
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Originally posted by universalcode universalcode wrote:

i've got my 98 Custom all taken apart for polishing and i also happen to have a 5-piece Velocity Spring Kit. i purchased it online only so my total would reach a certain price point so i could receive free shipping. so, i'm wondering:

what's the advantage to replacing the stock spring? You can use the springs to fine tune your velocity. Essentially, the velocity adjustment screw simply creates disturbance in the air flow that is released from the valve forward past the velocity screw. The screw disrupts the airflow increasing or decreasing the velocity of the air, thus increasing/decreasing the velocity of the paint. The amount/duration of air leaving the valve is controlled by how hard the hammer hits the valve pin. The harder it hits the pin, the more and longer the valve stays open, thus the more air is released from the opposite side, thus changing the airflow out the other end. Obviously, decreasing the pressure on the pin will decrease the amount of air out. So by using a harder or softer spring, you can theoretically fine tune the amount of air released and have less need for using the velocity screw. Less air released, greater efficiency. You can also use this in conjunction with a Rear Velocity Adjuster that replaces the stop back cap on the 98. This will allow you to essentially screw the velocity screw out so that it does not protrude into the airflow. You then use the RVA to adjust your velocity by increasing or decreasing the pressure on the spring.

why so many choices?

doesn't the existing velocity adjuster work just fine?
One thing to keep in mind. If you are using a Cyclone Feed or Response Trigger, these accessories work off of excess gas/air that isn't used to propel the ball. This is called blowback, it is the same pressure that also helps force the bolt back to it's cocked position. By reducing the amount of pressure on the valve pin and increase the efficiency of the valve, you also decrease the amount of blowback that is needed to run the RT and Cyclone, so you need to find the perfect balance between efficiency and excess. It may take you some time to properly dial in the perfect spring, and may have to be readjusted from time to time, especially if you are running CO2. 
"When I grow up I want to marry a rich man and live in a condor next to the beach" -- My 7yr old daughter.
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ok, so let me see if i have this right:
 
a stiffer spring will cause the hammer to hit the valve pin harder, releasing more air, thus increasing the velocity?
 
btw, i'm running compressed air and a cyclone feed only (no RT). any recomendations on which spring to use, or simply stick with stock? i mean, the gun fired great stock and i've never had a problem with the current gas consumption.
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Originally posted by universalcode universalcode wrote:

ok, so let me see if i have this right:
 
a stiffer spring will cause the hammer to hit the valve pin harder, releasing more air, thus increasing the velocity? Yes. And a softer spring will do just the opposite.
 
btw, i'm running compressed air and a cyclone feed only (no RT). any recomendations on which spring to use, or simply stick with stock? i mean, the gun fired great stock and i've never had a problem with the current gas consumption. Each set up is different. Trial and error is really the only way to be sure.
If it isn't broke and you are happy with the consumption, no real reason to swap it out. If you are lookin to tweak it, then sure, but otherwise leave it alone.
"When I grow up I want to marry a rich man and live in a condor next to the beach" -- My 7yr old daughter.
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