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Old 02-07-2008, 01:23 AM   #1 (permalink)
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Low Velocity on Phantom

So, at the pump game last night, I couldn't get my Phantom above 230 fps. It's not a disastrously low number, but it's enough to make me wonder if something is wrong.

Info:

•Indoor Game
•3.5 oz CO2
•VSC setup, gauged

I was careful to never turn the TPC clockwise by more than six turns, and it certainly seems to still be seated properly.

Any suggestions?

Thanks in advance!
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Old 02-07-2008, 01:32 AM   #2 (permalink)
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What pressure are you getting outta the tank?
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Old 02-07-2008, 11:51 AM   #3 (permalink)
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Weakened main spring would be my guess, replace with a blue Autococker main spring.
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Old 02-07-2008, 12:56 PM   #4 (permalink)
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My gauge indicates I'm getting about 850 psi out of the tank.

Would a main spring go after only two nights of play?
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Old 02-07-2008, 05:51 PM   #5 (permalink)
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Quote:
Originally Posted by VVulfe View Post
My gauge indicates I'm getting about 850 psi out of the tank.

Would a main spring go after only two nights of play?
Not if it was any good to start with. Should last for years, but maybe it missed heat treat and anneal, and was picked up off of the floor and thrown in with the rest of the batch. Stuff like that happens.

You should check your valve spring too. If it's not on the cup seal right or under it instead, the valve might be slamming shut too fast.

If you know the TPC is in the bolt correct, and you have 850 psi from the tank, it almost has to be something wrong with the spring set.
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Old 02-10-2008, 03:29 PM   #6 (permalink)
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I would try a softer valve spring. And check for leaks. Preoper ball to barrel also.
How long's the barrel you used?
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Old 02-10-2008, 03:39 PM   #7 (permalink)
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Maybe the chrono had a low or dead battery?

We had a chrono with a dead battery at the field and it wouldn't read anything higher than like 240. So I said screw it, went out with my Phantom, chronoed at the one on field and my velocity said like 320 or something. I know it wasn't my gun because multiple people were having the same problem.

Anyways, try ordering a stock set of springs, make sure your nylon set screw is set correctly, and use the correct detent ring and paint to bore match.
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Old 02-11-2008, 12:39 PM   #8 (permalink)
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Hm, it is only a 6" barrel (it's a duckslide) - I hadn't thought of this, but if it is a question of barrel length, hopefully a different strength spring will get the needed air down the barrel.

If it's not a question of barrel length, however, from what you've all said I think it sounds like the best course of action is still to pick up a parts kit, and try a new spring.

Thanks guys!
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Old 02-11-2008, 02:01 PM   #9 (permalink)
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Shorter barrel = less required air to move the ball.

What was the temperature out?

Also... max pressure out of a co2 tank is 800 ish.... if it's cooler you get less pressure... if it's hotter you get a little more...
but Heebs... it's CO2.. if the tanks full and not tinging (ting ting ting as you hit the tank with a coin) then you are getting at our around 800 psi.... it's not hpa

Check the springs, check ball to barrel fit (if the ball would roll out of the barrel, then you are going to have a really hard time getting the ball up to speed), check to make sure the asa is clean (for ****s and giggles).

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Old 02-11-2008, 02:04 PM   #10 (permalink)
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Quote:
Originally Posted by Schmitti View Post
Shorter barrel = less required air to move the ball.

E
unless the bore is too big.
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