I would like to know if anyone has confirmed if functioning of the regulator is afected by the size of the plenum.
(The biggger the plenum is, the worst regulation?)
Regards.
(The biggger the plenum is, the worst regulation?)
Regards.
Is the regulator afected by size of plenum?
- Thread starter Emu
- Start date
I can't see how a mechanical regulator would be impacted by the size of the air tank on either side. One possible impact could be refresh time after a shot - the larger plenum may take longer coming to a stable pressure.
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Yes they can be ...
Some regulators due to how there seat is configured, differ on how responsive seat will open or close. Small sips from valve on a large plenum may only have regulator refresh every other shot +/- or act as if creeping on each refresh cycle.
On a small plenum said regulator responds to pressure drop within plenum fully opening seat on every shot and generally found more consistent in noted ES values.
There is a lot of Ying / Yang of this works and that don't with setups and configurations.
It really with regulated PCP's comes down to how much pressure drop there is within the plenum and if or not the regulator can detect it and replenish it to a given pressure accurately shot after shot.
Tightest ES generally comes from Smaller and excessively large plenums ( Say a 10M pcp being very small & a USFT being non regulated and very large )
When in the middle where most PCP's operate, a Decent regulator and somewhat balanced plenum volume for the power being made can make or break how consistent the gun operates. There's No Free Lunch here and to have one gun that shoots Low Power and High power with low ES with little too no changes other than HST or Reg pressure change is a Hat Trick indeed.
Scott S
Some regulators due to how there seat is configured, differ on how responsive seat will open or close. Small sips from valve on a large plenum may only have regulator refresh every other shot +/- or act as if creeping on each refresh cycle.
On a small plenum said regulator responds to pressure drop within plenum fully opening seat on every shot and generally found more consistent in noted ES values.
There is a lot of Ying / Yang of this works and that don't with setups and configurations.
It really with regulated PCP's comes down to how much pressure drop there is within the plenum and if or not the regulator can detect it and replenish it to a given pressure accurately shot after shot.
Tightest ES generally comes from Smaller and excessively large plenums ( Say a 10M pcp being very small & a USFT being non regulated and very large )
When in the middle where most PCP's operate, a Decent regulator and somewhat balanced plenum volume for the power being made can make or break how consistent the gun operates. There's No Free Lunch here and to have one gun that shoots Low Power and High power with low ES with little too no changes other than HST or Reg pressure change is a Hat Trick indeed.
Scott S
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Motorhead is totally right, especially on the larger plenums. You can have your regulator set low and take a shot and the system won’t recognize that enough air has left the Plenum to activate the regulator to refill the Plenum which will cause your shots to be slower because the Plenum isn’t full. This is just one other issue that I can see added to motorheads well thought out and informative post.
This is most common on lower FPE guns.
This is most common on lower FPE guns.
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The significance of the regulator’s hysteresis will depend a lot on the state of tune. If it’s adjusted in the common way to about 97% of peak velocity, you will be hard pressed to distinguish its effect from others contributing to the extreme spread such as variation in hammer strike, pellet variances, etc.
But to the extent that you may want to minimize it, favor a hard valve seat over a spongy one. For example, PEEK or PEI over, say, nylon.
But to the extent that you may want to minimize it, favor a hard valve seat over a spongy one. For example, PEEK or PEI over, say, nylon.
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Yes it will be more affected by ambient temperature. You will see 3 to 5 bars difference between shooting in the morning vs shooting in afternoon with 72cc plenum.
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Besides the loads of chit-chat and the "Look-at-my-gun/quarry/group" threads, THIS one is very educational, very helpful indeed.
Thank you, Scott, Jason, Gregory, and others for sharing your expertise with us so freely! We appreciate you!
Matthias
Thank you, Scott, Jason, Gregory, and others for sharing your expertise with us so freely! We appreciate you!
Matthias
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