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Old 03-25-2012, 01:09 AM   #1 (permalink)
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Powertube Question

So, I have two Powertubes:

Lapco #6 cut down to Phantom length
and
Stock Phantom Powertube

When using the #6, I was really having to crank my TPC, pressure on my Stab at 600, and a heavy main spring to get 280. Well, when I found out it was stripping my cup seals (see Lapco #6 Destroying Cup Seals?), I switched back to the stock CCI Powertube.

Now with my stock powertube, my Stab is at about 500 and my TPC turned out from where it was with the #6. I guess I'll be sticking with the stock powertube.

My question is, why is this happening? I am simply curious and want input from others here with more experience than myself.
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Old 03-25-2012, 05:17 AM   #2 (permalink)
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Maybe the increase in open space of the #6 required more pressure. I believe the rule was:

Small spaces for 12s and large ports for CA.
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Old 03-25-2012, 12:18 PM   #3 (permalink)
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Quote:
Originally Posted by Ziggymarley View Post
Maybe the increase in open space of the #6 required more pressure. I believe the rule was:

Small spaces for 12s and large ports for CA.
Interesting. I have never heard that. Makes sense though, I think.

Quote:
Originally Posted by CJOttawa View Post
Who knows? I've had bad luck with Lapco internals in Phantoms. I stopped trying to figure out why and just stick with what works.
You and me both.
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Old 03-25-2012, 11:14 PM   #4 (permalink)
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I've used CCI valve tubes in every Nelson pump I've ever owned, and I owned them all, since 1987. It's a superior product. LAPCO's are a copy of CCI's. The only real benefit over CCI that LAPCO has is the varying valve diameters, if this is important to you.
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