Spring vs. Gas Piston. Is it really a big deal?



Author Topic: Spring vs. Gas Piston. Is it really a big deal?  (Read 51420 times)

Offline Makincheez

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #20 on: May 03, 2011, 02:49:21 AM »
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Offline Jay

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #21 on: May 03, 2011, 02:54:38 AM »
From what we have discussed on here Michael they seem to loose just a bit in cold weather(20 or so fps), we have never really came up with if its the nitrogen in the piston or just the colds effect on steel,lubes an other factors in the guns same as on a springer really. Guess we need someone to take a piston an check compression weight in warm an cold so we can have a positive answer to end the debate. Anybody got a spare around an the time?
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Wampus

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #22 on: May 03, 2011, 10:26:25 AM »
All gasses change pressure with temp change if volume is held constant.  Nitrogen is no different from oxygen in that regard.  Air is about 78% nitrogen anyway.  The reason pure nitrogen is used in the pistons is bcause it dosen't oxidize the materials and it's moisture-free.  Water changing from liquid to vapor and back again has a big effect on pressure so a very dry gas is critical.  Nitrogen is just readily available, cheap, and inert, but it absolutely will lose pressure as the temp drops and increase pressure as the temp rises.
« Last Edit: May 03, 2011, 10:32:09 AM by Wampus »

airiscool

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #23 on: May 03, 2011, 01:40:38 PM »

michael word

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #24 on: May 04, 2011, 02:04:33 AM »
Thank you everyone for clearing the up for me.

oldpink

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #25 on: May 04, 2011, 02:56:23 AM »
As was pointed out, all gases are affected to some extent by temperature changes, some more than others, and certainly nitrogen is less affected than compressed air.
Also, while gas rams are affected by temperature change, they seem much less so than spring guns, and it takes a much greater temperature drop to see that change.

rbshoots

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #26 on: May 04, 2011, 05:46:17 AM »
not all.....the theoben rams are air filled and are made so the user, with the pump sold for the ram, can adjust the pressure in the ram to suit the users need.....they are however the upper end of the price spectrum

Offline uncle paulie

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #27 on: May 04, 2011, 07:53:25 AM »
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zzyzx

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #28 on: May 04, 2011, 10:32:38 AM »
At 15-40 below zero you are so chilly you slow down a bit and really don't notice the rifle doing so.  ;-)

Offline lloyd-ss

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Re: Spring vs. Gas Piston. Is it really a big deal?
« Reply #29 on: May 04, 2011, 01:15:17 PM »
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