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Old 09-19-2014, 02:45 PM #1
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Question Farting?

Hey guys! I'm pretty new to pump. I have a 2k3 Prostock with the ANS pump arm on it. I have a couple of questions about it. I am fairly confused about "farting" and different springs, and valves and whatnot. I've got a pretty gnarly fart, and my friend's pump has virtually none. I've got my marker shooting around 295 pretty consistently.

Is there a way to stop the farting without having to buy any springs or anything.

Also, is there a pump arm that you guys recommend over the ANS one? I took the spring out of mine, and it feels better to me.
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Old 09-19-2014, 03:20 PM #2
David A.
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Welcome to pump play!

Farting is a common characteristic that is addressed. It does not sound good and is a sign of poor efficiency.

Farting, is caused by the hammer bouncing on the valve pin, causing the valve to open and close, again making that farting sound and wasting air. for some markers with short or light valve-pins, it is hard to fix, for some markers it is as easy as replacing a spring or adjusting the operating (regulator) pressure.

If you raise the operating pressure the air will slam the valve shut, reducing the hammer bounce, making the a nicer sound and wasting less air. If you have a regulator gauge, start at 350psi and see if that helps. You will need to adjust the IVG to re-set the velocity.

If you do not have a gauge, search "sweet-spotting Autococker" and follow those instructions, then turn the pressure up a little at a time until the velocity drops a bit, then set you IVG to your 280-300fps. If that does not work, you may need to get a set of matched springs and play with that a bit.

Or you can get a set of lower internals from CCM. In this case you will have a valve, valve pin and springs that are designed to work together to give you both good efficiency and a great sound.

If you are looking for a better pump kit, nothing beats the CCM kits. They have two grades and a couple styles of pump handles. I have several CCM standard pump kits on various markers, they are great. I recently purchased one of their lower priced "lightweight" pump kits, at $50 they are well worth it and while not as smooth as their standard it, they are still very good.

If you are going to order anything from CCM, call Mel at CCM and she will be able to be sure you are getting the right stuff and help you out with the settings. She can be reached at:1-877-412-6850

Good Luck!
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Last edited by David A. : 09-19-2014 at 03:30 PM.
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Old 09-20-2014, 10:19 AM #3
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My farting main culprit is cause by Mexican food or dairy.



^^^^David is correct.
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Old 09-20-2014, 10:56 AM #4
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Oh yeah - Keep that dairy AWAY!
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Old 09-20-2014, 11:01 AM #5
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Best fix for farting
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Old 09-20-2014, 11:23 AM #6
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This got derailed fast
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Old 09-20-2014, 03:05 PM #7
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Hahahaha funny stuff. Thanks David for the info!! Gonna fix the gun up this weekend!
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Old 09-21-2014, 08:43 PM #8
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doesnt the bob long mvp fart also though?
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Old 09-21-2014, 08:54 PM #9
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It sure does
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Old 09-21-2014, 10:57 PM #10
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Stock WGP valves are known to be noisy. I just swapped the stock valve in my '05 Superstock with the CCM Lower Tube Kit. Sounds like a brand new marker and feels like an entirely new marker. I've used spring kits before and Palmers LT valves. I probably wouldn't buy anything other than the CCM kit again.
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Old 09-23-2014, 12:16 PM #11
David A.
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Quote:
Originally Posted by laundryhampr View Post
doesnt the bob long mvp fart also though?
I also have an MVP, and it does make a farty sound too, though it does not sound like an Autococker fart. I am not sure what causes it in the MVP, but there is a modification that is supposed to reduce that sound. I put a TJ Customs Delrin bolt on mine, it did not eliminate the sound, though it does pump smoother and makes a different sound.

My understanding is the "washer mod" is the answer, I have not tried it yet.
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Old 09-23-2014, 07:00 PM #12
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IIRC getting the correct fps it's hit or miss with washer mod
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Old 10-17-2014, 02:53 PM #13
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if you don't fart and hold them in one day you will spontaneously combust.
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