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 Post subject: Hipac Owners
PostPosted: Tue May 06, 2014 1:01 pm 
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I bought a hipac from a member here, was suggested that I only fill to 1500-1700psi to keep the fps down. Recently I had enough of the low shot count so decided to fill to 200bar... well to my surprise the first shot was under 200fps and very slowly climbed to 490+. Right around 2400-2200psi it starts to climb rapidly. At under 2000psi it will shy rocket! The gun has a velocity adjuster and is all the way in to get to 200fps at 200bar. Any ideas what's going on here?? thanks

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:25 pm 
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Wow, 200bar is a lot of pressure for both the hipac and whatever you are using it in. Be safe....


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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:27 pm 
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Location: Rocky Mtn Hse Alberta
v30 wrote:
Wow, 200bar is a lot of pressure for both the hipac and whatever you are using it in. Be safe....

X2
Not a good idea!
You are having valve lock. Hammer spring too weak for that pressure.
How did you decide to pressure to 200 bar?

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:31 pm 
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appreciate the concern, the hipac is rated for 3000psi...? I don't get this at all! It should be doing the reverse start at high fps and slowly descend..

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:33 pm 
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Hammer spring needs more kapooey.
Adjuster only takes you so far, when you're talking 200 bar.
Did you get a spring with your hipac as they are sold with as new?
You are on the edge of valve lock for the spring you're running, where hammer impact just barely opens valve due to the pressure inside.
edit: Voltar beat me to it...
Please ensure you have beefed up the valve pin screw to avoid failure and a valve in the eye.


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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:40 pm 
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[quote="Voltar1"] You are having valve lock. Hammer spring too weak for that pressure.[quote]
yep!!
that's a lot of unregulated pressure on that valve stem, stronger hammer spring or lower your PSI. :wink:
I would first definitely lower the psi, and still increase the hammer spring strength if your going after fps.

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Last edited by Ace on Tue May 06, 2014 1:42 pm, edited 1 time in total.

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:42 pm 
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Location: its all in the location
Voltar: wanted more shots, going to listen to you guys if this is not safe..? What's the max for the hipac? this was magnumair's 2260 so all is safe, valve pinned. Are the hipac's not rated for 3000psi??

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:44 pm 
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Location: its all in the location
Ace wrote:
Voltar1 wrote:
You are having valve lock. Hammer spring too weak for that pressure.
Quote:
yep!!
that's a lot of unregulated pressure on that valve stem, stronger hammer spring or lower your PSI. :wink:
I would first lower the psi, and still increase the hammer spring strength if your going after fps.



ok, understand what's going on now. I want to use the hipac to its full potential, so will work on the hammer spring.

thanks guys for the input! :)

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"When Obi-wan talked about the darkside of the force who knew he was referring to windows...?"


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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 1:49 pm 
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I have read they can handle, pressure to 3000psi.
but I'm not sure if this applies to yours so don't take my word for it.

read half way down:
http://www.powermax-hipac.com/Pages/default.aspx

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:00 pm 
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Take one apart and see if you would fill to that pressure!
Is your valve stem the OEM soft stem? A delrin stem would open easier.

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:13 pm 
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true Walter i personally wouldn't but just stating what Ive read.
I don't like to fill things at that high pressure without some kind of burst disk in place but thats just me. :wink:

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:22 pm 
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Location: Rocky Mtn Hse Alberta
The HiPac is weak where the tube threads to the adapter. Only two threads engagement and poorly made like you find on a lamp or such from India,Pakistan. Just not made by a craftsman. Has to be seen to appreciate.

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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:23 pm 
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Location: its all in the location
I've personally never disassemble the gun yet, so I don't know for sure what valve stem is in there. Being one of George's creations I would think it has the delrin already. So is the consensuses that I should stay under 2000psi? I'm not after high fps but rather higher shot count.

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"When Obi-wan talked about the darkside of the force who knew he was referring to windows...?"


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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:30 pm 
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Location: its all in the location
Voltar1 wrote:
The HiPac is weak where the tube threads to the adapter. Only two threads engagement and poorly made like you find on a lamp or such from India,Pakistan. Just not made by a craftsman. Has to be seen to appreciate.



:shock: :shock: :shock: :shock: :shock: uhh sir that is all i need to hear! thank you

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"When Obi-wan talked about the darkside of the force who knew he was referring to windows...?"


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 Post subject: Re: Hipac Owners
PostPosted: Tue May 06, 2014 2:47 pm 
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You want more shots?
Return it to work on CO2..
You will get more consistent shots but the give away is speed F/S.

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