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Old 03-22-2013, 06:31 PM #1
ladysmanfelpz
 
 
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Low pressure project question.

So recently picked up a piranha usp pistol and am stoked cuz I love working on spyders and always wanted a pistol. K so not making this guy low pressure (don't even think it has the air reserve to be capable of it) but definitely modifying it. So I drilled out the valve and bolt to 5/16 of an inch and polished up striker and plant to slot mod it. So I need a new valve pin as my stock leaks and the cupseal is irreplaceable. Stupid Piranha!! But as I am making this a high flow smoother shooting marker, should I pick up a magnaport valve pin or keep stock size? I'm afraid it'll be too tough to tune and dwell will be way to short if I get a high flow valve pin. On my old school kingman hammer I am running the heaviest valve spring and lightest hammer spring just from one of my great polish jobs and it still seems to be shooting hot. So let me know which one I should go with and your experiences with high flowing high pressure projects.
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Old 03-22-2013, 07:00 PM #2
Opteron-O3
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You will reach a certain point that the marker will need a regulator in order to bring down the velocity. Springs can only do so much. Especially since you going for the highest flow possible.
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Old 03-22-2013, 07:55 PM #3
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man i know. Thats why if you read it fully I said I'm keeping it high pressure. So do I keep the stock valve pin or go high flow? guessing the stock should be sufficient enough right?
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Old 03-22-2013, 08:37 PM #4
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Stock valve pin. But even then you're still going to run into issues
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Old 03-23-2013, 02:07 PM #5
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why do you say that?
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Old 03-23-2013, 03:56 PM #6
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Because whenever you increase flow, you increase the velocity of the paintball. It'll get to the point, that even with the stiffest valve spring, and weakest striker spring, the velocity will be too high. In fact, you may run into the issue where you need a lighter striker spring to bring the velocity below 300fps, but if the spring were to become any lighter, the gun would fail to recock because it wouldn't be able to open the valve enough to get enough blowback gas (in theory i should say, however, this could be remedied by griding portions of the valve pin to direct more air to the striker)

you are going to need some sort of regulator to drop the pressure if you intend to do any substantial modifications to the air flow.
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Old 03-29-2013, 08:13 AM #7
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Quote:
Originally Posted by nenkitsune View Post
Because whenever you increase flow, you increase the velocity of the paintball. It'll get to the point, that even with the stiffest valve spring, and weakest striker spring, the velocity will be too high. In fact, you may run into the issue where you need a lighter striker spring to bring the velocity below 300fps, but if the spring were to become any lighter, the gun would fail to recock because it wouldn't be able to open the valve enough to get enough blowback gas (in theory i should say, however, this could be remedied by griding portions of the valve pin to direct more air to the striker)

you are going to need some sort of regulator to drop the pressure if you intend to do any substantial modifications to the air flow.
I think he said he plans to slot mod it, in that case he would be fine doing whatever. It pump guns, higher flow= lower spring tension= easier cocking.
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