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Old 03-13-2010, 02:04 AM   #1 (permalink)
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Refurb Tac 8 (Special Edition) vs SA-8 - Internals

For the curious side of all of us, here are some internal pics, looks to be pretty much the same as the T8.




Bolt
Bolt is a soft touch one, not the FS one that I had before


SA-8



The power chamber seems to be different, though this might be the older styled air chamber.


SA-8


O-ring is in the back


SA-8



Air Chamber



SA-8



Back Block


SA-8


Pressure Relief Valve


SA-8



Regulator Spring
Looks like the reg springs are the same, I haven't tried them both for tensions though.


SA-8



Regulator Body/Trigger Spring
The spring that's on the trigger is also much softer.



SA-8

Last edited by CovertRssian; 03-14-2010 at 04:34 AM.
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Old 03-13-2010, 02:34 AM   #2 (permalink)
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Old 03-13-2010, 03:16 AM   #3 (permalink)
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Excellent, thank you for the pictures.
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Old 03-13-2010, 10:33 AM   #4 (permalink)
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Great pics, thanks!

The reg spring that would matter the most is the hefty one between the adjuster and piston. The little spring only keeps the ball bearing seated.

It looks like they gave you a lighter torsion spring behind the trigger, as well as the extension spring in the sear assembly. I came to prefer the heavy-ish torsion spring on my SA-8 compared to the extension spring of my Tac-8... I hope mine looks like yours when I get it.


It also looks like your valve/sear block is different. The flats on the mag nipple are "clocked" differently, and some of the marks on the SA-8 assembly have "disappeared".

I was tempted to put little I.D. marks on my stuff to see how much was changed out by Tiberius...
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Old 03-13-2010, 01:22 PM   #5 (permalink)
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Compare it to the spring in regular T8's. The spring pushes on the ball, that closes the airway between two chambers. The harder it pushes on it, the higher PSI needed to open it back up. Hence you get more PSI in the second chamber and in the Engine.

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Old 03-13-2010, 01:51 PM   #6 (permalink)
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The tip of the piston pushes the ball off the seat. As the piston face experiences increased pressure, it compresses the big spring, eventually pulling the tip out and allowing the ball to seat, shutting off the flow. The small spring is just there to press the ball against the seat o-ring when the piston tip has pulled away.

As with all paintball regs, the piston is a "sensing" surface. The output pressure acts on the surface area of the piston (compared to ambient pressure). If it's 1 square inch and the output pressure is 300psi, there's 300 pounds of force compressing the main spring.

Also, with ~800psi from the 12gram on the back side of the ball bearing, it would take an equal force (and more, thanks to the spring), to push the ball off the seat. The T8 and SA-8 don't run at 800+psi, so it can't work the way you describe.


Anyway, thanks again for the great pics. They make the waiting easier.

Last edited by MondoMor; 03-13-2010 at 02:04 PM.
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Old 03-13-2010, 03:47 PM   #7 (permalink)
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Not 100% sure how it exactly works, haven't sat down and thought about it . But, I replaced my SA-8 spring with a custom shortened pen spring.



My velocity changed quite a bit, went from about 300 FPS, to 260 FPS without changing the regulator screw location.
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Old 03-14-2010, 12:22 AM   #8 (permalink)
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Jut to clarify, this is the gun you got back in exchange from Tiberius...the special edition black nickle one right? There is a "T8-R" that's being sold that's refurbished that's apparently closer to an SA-8.
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Old 03-14-2010, 04:34 AM   #9 (permalink)
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Quote:
Originally Posted by Jaan View Post
Jut to clarify, this is the gun you got back in exchange from Tiberius...the special edition black nickle one right? There is a "T8-R" that's being sold that's refurbished that's apparently closer to an SA-8.
You are correct, this is still a refurbished T8, just the special edition. I am VERY curious to see the internals of the T8-R.
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