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Old 01-20-2013, 02:06 AM #1
thisfoolmark
 
 
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whydoes my pump hick-up and jump FPS??

i got an 02 dye cocker pump .... my problem is that when i shoot it it hick ups and it jumps FPS From an average of 260fps then it jumps to 280fps then it jumps to 190 fps.. could it be my reg or my tank (stubby).... im not sure what the problem is.. plz help!!
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Old 01-20-2013, 09:46 PM #2
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Are you matching your paint to barrel bore?
Are you holding your pump handle when you check your speed?
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Old 01-21-2013, 12:04 AM #3
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user error.
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Old 01-21-2013, 03:19 AM #4
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Are you matching your paint to barrel bore?
Are you holding your pump handle when you check your speed?
yes to all the above!!!!
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Old 01-21-2013, 06:47 AM #5
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check/replace your springs, clean/sweetspot your reg, clean/polish your internals. make sure your balls can be blown through the barrel with little effort, while not just dropping out.
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Old 01-21-2013, 04:26 PM #6
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It's very likely that you need to use a tighter bore than what you have. Try that, then let us know what happens.

The reg and internals are very unlikely to be the culprit.
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Old 01-21-2013, 07:32 PM #7
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Some masking tape detents would be a good thing to try in the meantime.
They should at least eliminate the possibility of partial rollouts.
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Old 01-22-2013, 07:53 PM #8
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Changed up my bore size to fit paint shoots a little better but still can't shoot a consistant 280 fps.
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Old 01-22-2013, 08:17 PM #9
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underbore and use better paint. my CCM S5 shoots 285 +/- 1 when slightly underbored.
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Old 01-22-2013, 08:34 PM #10
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underbore and use better paint. my CCM S5 shoots 285 +/- 1 when slightly underbored.
Will try that this weekend... Doesn't help to have a under performing pump on an x ball field goin against eletros....
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Old 01-22-2013, 08:36 PM #11
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it's a good day when you're +/- 0 over the chrono all day.
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Old 01-23-2013, 07:56 AM #12
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I have to say that it's impossible to get +/-1 all day. No weather or paint is perfect!
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Old 01-23-2013, 09:18 AM #13
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I have to say that it's impossible to get +/-1 all day. No weather or paint is perfect!
Evolve Pi Reg

mind = Blown

between +/- 1 and +/- 2 all day. went from 40 degrees in the morning to 74 in the afternoon. swapped barrels up .006 once.



AAANY ways. Check your spring setup. My valve spring caught on my back frame screw until I cut it down a bit.

if that's not it you might have some valve pressure issues. re-sweetspot and turn IVG in to desired, make sure to shoot 3-4 times in between every adjustment. that USUALLY fixes things.

Edit - check for obstructions in your valve air chamber, you might have a o-ring bouncing around in there blocking flow every couple shots.

Last edited by Pdubs : 01-23-2013 at 09:20 AM.
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Old 01-23-2013, 10:40 AM #14
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If you didn't chronograph every shot, I still find it difficult to believe. Just sayin'.
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Old 01-24-2013, 10:14 AM #15
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If you didn't chronograph every shot, I still find it difficult to believe. Just sayin'.
True. I usually do 5-10 first crono, and then another 5-10 if the temp changes enough (it did).

Considering I rarely shoot fast enough for shoot down it seemed good enough
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Old 01-24-2013, 11:19 AM #16
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If you have shoot down on any gun with a modern tank, something is wrong.
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Old 01-24-2013, 12:44 PM #17
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If you didn't chronograph every shot, I still find it difficult to believe. Just sayin'.
half my day is spent at the chrono tryna figure out why my gun drops dramatically ..260fps 270fps then a curve ball 190fps!!!
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Old 01-24-2013, 12:46 PM #18
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half my day is spent at the chrono tryna figure out why my gun drops dramatically ..260fps 270fps then a curve ball 190fps!!!
i am runnin a ninja stubby tank.. could that be the problem
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Old 01-24-2013, 12:49 PM #19
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i am runnin a ninja stubby tank.. could that be the problem
service your regs and sweet spot the HP reg on the marker.
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Old 01-24-2013, 01:32 PM #20
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Leave your tank reg alone. The chances of it being the issue is next to nothing. There's a slim chance your inline reg is causing the issue, but not likely if it is so random. Simply swap to a different reg to see if you can get it consistent.

Check the bottom tube around the hammer for dirt, then try other barrel bore options.
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Old 01-24-2013, 01:37 PM #21
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Quote:
Originally Posted by Castro #66 View Post
Leave your tank reg alone. The chances of it being the issue is next to nothing. There's a slim chance your inline reg is causing the issue, but not likely if it is so random. Simply swap to a different reg to see if you can get it consistent.

Check the bottom tube around the hammer for dirt, then try other barrel bore options.
i forgot about the lower tube... my S5's reg was singing/whistling/squeaking so i cleaned and lubed it, no more singing.
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