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Old 10-27-2015, 12:48 PM   #1 (permalink)
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Cocker main spring

So my main 2 pumps, the halfblocked AIM eagle and my T2 have been tuned and chronod to 280-285 fps. They were both used and shooting fine last weekend. This weekend I go to play with them and they were both down around 210 fps.
If they sit in my car all week, do main springs soften up? I assume that would happen at a much higher heat. They were originally around ivg 3 turns in and I had to crank em to about 5 turns in (which is more than I'd like)
The valves resistance to opening at higher and lower pressures was still behaving the same, it just seemed as if the spring softened up.
If anybody has had this happen or has any thoughts, let me know!
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Old 10-27-2015, 12:52 PM   #2 (permalink)
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Your regs crept and they are running at higher pressure then the sweet spot. I would rebuild the regs.
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Old 10-27-2015, 02:27 PM   #3 (permalink)
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Your regs crept and they are running at higher pressure then the sweet spot. I would rebuild the regs.
I will rebuild them, thanks. Can you explain what happens when a reg creeps? Is there a poor seal around the piston, or on the valve that lets air into the reg/ marker? Both of them are CCM regs, so the pretty common ref design. Thanks

I guess what I'm trying to get at is that for the past 2 months my marker has been shooting 280-285 with the ivg 3 turns in and at an unknown but unchanged pressure for those 2 months. Then on Sunday, it's shooting 220ish with nothing adjusted differently. With the IVG 3 turns in, I went from low pressure (venting down the barrel), increased pressure 1/4 turn at a time, got to about the 220-235 FPS range, then kept increasing pressure till velocity dropped again.

What would cause it to not get up the the previous, and desired FPS at any pressure between low 100psi to high 350+psi? Is it purely the regs and I need to rebuild them? It seems like they're still regulating, recharging, and putting out consistent pressure, and adjustable pressure. So it almost feels like I have mismatched springs even though these springs have been working for the past 2 months.
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Originally Posted by Jkoselka View Post
If one is going to be an ambassador to the sport do your best to try to convey to new players what the sport is about and attempt to convey the same message to the players that are being abusive.

Last edited by pancake; 10-27-2015 at 04:43 PM.
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Old 10-28-2015, 01:21 AM   #4 (permalink)
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This video may help explain. https://m.youtube.com/watch?v=Yty2wMSSQDk
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