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Old 06-22-2013, 08:29 PM
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Velocity issues with older Tippmann A5's

Last year, after an absence of some 20 odd years, I came back to paintball. Not knowing if I would continue, I purchased two A5's from different sources. One for me and one for the missus.

One is an A5 for lack of a better name, would be considered the stealth version. Has a flatline barrel, assault collapsible stock, M16 carry handle, red dot sight, low profile hopper and response trigger. The other is a bullpup version that some people call a B5, with a flatline and a rampage board.

My problem is low and inconsistent velocity on both, but greater with the B5. Both have been to a professional paintball repair twice and I have had the springs changed, the hammer replaced with stock. I myself have taken them apart, switched out all the O-rings, polished the interior and lubed. My velocity adjustment screw is almost all the way out, and I only use CO2 or compressed air.

The most I get with my stealth is about 280 and the B5 doesn't go past 240. Speed is low, and all across the board (not consistent). I only use field paint, and premium at that (can't remember the brand).

Any help would be appreciated!
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Old 06-22-2013, 08:46 PM
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Re: Velocity issues with older Tippmann A5's

check for cracks in the power tube.
make sure you're tank is working right to.
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Old 06-22-2013, 09:01 PM
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Re: Velocity issues with older Tippmann A5's

I'm assuming there is no rust in the marker? What type of tank are you using (besides the C3, paintball guns only run on CO2 or compressed air). If you're using an LP tank, that would be your problem right there. There are a LOT of things that could cause those issues. Please list exact set ups.
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Old 06-22-2013, 09:16 PM
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Re: Velocity issues with older Tippmann A5's

Hi there, could also be a worn rear spring if markers are old and/or used a lot. Found this for you for some possible causes/solutions Low velocity?
TK
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Old 06-22-2013, 10:26 PM
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Re: Velocity issues with older Tippmann A5's

Replace the old 2 channel valve with the newer/4 channel/X7c valve.
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Old 06-23-2013, 10:11 AM
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Re: Velocity issues with older Tippmann A5's

1) Checked both power tubes for cracks first off. None found.
2) No apparent rust internally. I have polished the interior with steel wool. Cleaned and lubed.
3) By way of tanks, I have new CO2 tanks (20 oz from JT) and for compressed air I have a 3000 psi tank from Empire. All are less than 6 months old.
4) Springs were swapped out. I first used higher tension springs then switched back to stock springs.
5) Have not considered the valve. Now my set up is an A5 but you mention an X7 valve. Are they compatible?
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Old 06-23-2013, 02:19 PM
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Re: Velocity issues with older Tippmann A5's

Quote:
Originally Posted by johnfalto
1) Checked both power tubes for cracks first off. None found.
2) No apparent rust internally. I have polished the interior with steel wool. Cleaned and lubed.
3) By way of tanks, I have new CO2 tanks (20 oz from JT) and for compressed air I have a 3000 psi tank from Empire. All are less than 6 months old.
4) Springs were swapped out. I first used higher tension springs then switched back to stock springs.
5) Have not considered the valve. Now my set up is an A5 but you mention an X7 valve. Are they compatible?
the original x7 valve is compatible.
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Old 06-24-2013, 01:40 PM
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Re: Velocity issues with older Tippmann A5's

I bet money it is your power tube... Seriously, just clean it, when ever I see velocity problems with an A-5 it is a result of the power tube being dirty inside. (and it doesn't take much to cause what you are talking about.

Co2 is dirty, so cleaning your powertube when you see velocity issues should always be the first step you take. Make sure you strip it all the way down, and lightly oil those o-rings inside. Clean off the brass washer inside, and put it all back together, and it will be good to go.

Here is a video someone else did a long time ago that shows how it is done. I have seen brand new out of the box A-5s with dirty power tubes from the factory... So it only takes a little bit of dirt/grime for it to choke your marker and cause low velocity issues.

Tippmann A-5 Power Tube & Valve Basic Maintenance - YouTube
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Old 06-24-2013, 04:41 PM
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Re: Velocity issues with older Tippmann A5's

Although I did inspect the power tube and did not notice any cracks, I also stripped it down, cleaned and lubed it. However maybe there is something that I missed.

So yesterday I ordered a new powertube (aluminum) and a new valve and see where that takes me.

I am just frustrated seeing my paint fall short, and then getting marked (and hard) by the opponent I was going after (yes I know that they could have amped up their FPS after chrono, so we will leave it at that - my velocity is still low and non-consistent).
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Old 06-25-2013, 03:28 PM
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Re: Velocity issues with older Tippmann A5's

Lots of people have had problems with the aftermarket aluminum powertubes.
I highly recommend sticking with a stock Tippmann powertube to avoid even more problems.
I've had older and newer A5s.
The older ones were always a little low on velocity using HPA.
Replacing the 2 channel valve with a 4 channel valve fixed with no other changes.
Hope you get this sorted out.
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