Posted by: Tom Sparkman on November 11, 2003 at 21:45:51

: I remember reading in my Palmer Stabilizer instructions that you shouldn't have an expansion chamber downstream from a regulator as it would reduce the effectiveness of the regulator considerably. : Would that be an overstated concern in this case? Or would there be a noticable change in the effectiveness of the HPA tank regulator? : : : Converting my rebel to nitrogen, wondering if the expansion chamber will hurt performance, or if it's ok to just leave it on. : : It's OK - you'll just loose a litte more air when you degas your gun. : : It'll make a nice foregrip too. : : Tom Yes, I forgot about that. It's possible that more volume can give more pressure variations, but it depends. The way a regulator works is that the upstream pressure is balanced by a spring and the downstream pressure. When the downstream pressure drops enough, the reg allows more air past the seat until the downstream pressure+spring balances the upstream pressure. Hypothetical - if it takes 5 shots before the tank req reacts, tripling the volume will mean that it will take 15 shots before it reacts. So, if the reg reacts on at 750psi and off at 800psi, you would get 5 shots starting at 800 and ending at 750psi (like 800,790,780,770,760) or with the large volume 15 shots starting at 800 and ending at 750 - bottom line, you are still going to get the same pressure variations, just with a different pressure curve for each. Now, if a regulator reacts after 1 shot, then increasing the volume will degrade performance. If the gun an Automag, then it won't matter (reg built in). Final thought - if the person notices a difference, remove the x-chamber and use a hose in its place with an ASA to 1/8" adaptor (cheap solution). Tom :)

Follow Ups: Post a Followup Show your name as: DefaultRealnameBothNickname E-Mail address (eg: joeschmoe@aol.com): Show your e-mail address? DefaultYesNo Your Password: Don't have a password? CLICK HERE - Forgot your password? CLICK HERE Subject: Subject:Message: : : I remember reading in my Palmer Stabilizer instructions that you shouldn't have an expansion chamber downstream from a regulator as it would reduce the effectiveness of the regulator considerably. : : Would that be an overstated concern in this case? Or would there be a noticable change in the effectiveness of the HPA tank regulator? : : : : Converting my rebel to nitrogen, wondering if the expansion chamber will hurt performance, or if it's ok to just leave it on. : : : It's OK - you'll just loose a litte more air when you degas your gun. : : : It'll make a nice foregrip too. : : : Tom : Yes, I forgot about that. It's possible that more volume can give more pressure variations, but it depends. : The way a regulator works is that the upstream pressure is balanced by a spring and the downstream pressure. When the downstream pressure drops enough, the reg allows more air past the seat until the downstream pressure+spring balances the upstream pressure. : Hypothetical - if it takes 5 shots before the tank req reacts, tripling the volume will mean that it will take 15 shots before it reacts. So, if the reg reacts on at 750psi and off at 800psi, you would get 5 shots starting at 800 and ending at 750psi (like 800,790,780,770,760) or with the large volume 15 shots starting at 800 and ending at 750 - bottom line, you are still going to get the same pressure variations, just with a different pressure curve for each. : Now, if a regulator reacts after 1 shot, then increasing the volume will degrade performance. : If the gun an Automag, then it won't matter (reg built in). : Final thought - if the person notices a difference, remove the x-chamber and use a hose in its place with an ASA to 1/8" adaptor (cheap solution). : Tom :) [ Follow Ups ] [ Post Followup ] [ WARPIG Tech Talk - Air ]