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Old 01-24-2011, 09:54 AM   #371 (permalink)
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Unfortunately unless Simon was to share with us we really have no way so far of knowing what kind of life expectancy those PT's have either.

Two ports on the old ones as well indeed.
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I don't so much make money, as provide a conduit for it's movement.
Mega Z for sale: http://www.mcarterbrown.com/forums/m...el-mega-z.html
Stock class = 12grams and a stick feed. End discussion.
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Old 01-24-2011, 09:57 AM   #372 (permalink)
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Well... you don't want something that will be brittle... and you don't want something that will be so hard it will overly wear on the metal sliding on it.

And yes.. big ports to reduce turbulence. Look at the space that air has to enter.. it's what, maybe a tenth of an inch. The old ports were about that big but were angled up to allow a flow path.. Simon short cutted and just cross drilled as big a hole as would fit. Which is better? Don't know.. beat on the gun in a bunch of games and see if you can get the PT to snap.. (something plasticy will probably fail first though).

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Old 01-24-2011, 10:00 AM   #373 (permalink)
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The old ports were about that big but were angled up to allow a flow path.. Simon short cutted and just cross drilled as big a hole as would fit.
Financial decision to get to the MSRP they needed?
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Quote:
Originally Posted by Robertsr View Post
I don't so much make money, as provide a conduit for it's movement.
Mega Z for sale: http://www.mcarterbrown.com/forums/m...el-mega-z.html
Stock class = 12grams and a stick feed. End discussion.
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Old 01-24-2011, 10:03 AM   #374 (permalink)
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I'm sure.
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Old 01-24-2011, 10:04 AM   #375 (permalink)
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Ok now that that makes since in my head, back on topic
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Quote:
Originally Posted by Robertsr View Post
I don't so much make money, as provide a conduit for it's movement.
Mega Z for sale: http://www.mcarterbrown.com/forums/m...el-mega-z.html
Stock class = 12grams and a stick feed. End discussion.
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Old 01-24-2011, 10:09 AM   #376 (permalink)
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I'm going to keep quiet until we see results from newmaticarsenal's new PT. If that works out then I'll be pretty happy.

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Old 01-24-2011, 10:11 AM   #377 (permalink)
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I'm looking forward to testing Yodas valve nut, and as soon as I can talk the wife into letting me use reballs in the house, or she has to work late which ever happens first, I'll get you guys some results on CCI and Standard length Lapco#6 PTs so we can see if the length changes anything there. I'm also interested to see what the results of this new gigantic PT and TPC are.
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Quote:
Originally Posted by Robertsr View Post
I don't so much make money, as provide a conduit for it's movement.
Mega Z for sale: http://www.mcarterbrown.com/forums/m...el-mega-z.html
Stock class = 12grams and a stick feed. End discussion.
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Old 01-24-2011, 10:19 AM   #378 (permalink)
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Quote:
Originally Posted by Greenmtnphantom View Post
Financial decision to get to the MSRP they needed?

I used to draw quotes for exactly that kind of part, made in vast quantities on a swiss screw machine...

He could've had any hole pattern he wanted, as long as the holes were at a right angle. Without increasing the cost at all.

You will notice, that the new tracers with the two holes meet the cross section of the powertube, as schmitty suggested would be ideal...

I think that we should have a significantly greater hole than the cross section of the powertube, because the angle and turbulence presents so much restriction... Therein lies the challenge, right?

I think when I get to that point, I'm going to use a square endmill to cut slots, similar to what Yoda suggested earlier, but without a ball endmill. To maximize strength, I think I would use a ball endmill at the bottom of the powertube bore hole...
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Old 01-24-2011, 10:27 AM   #379 (permalink)
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Quote:
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I think that we should have a significantly greater hole than the cross section of the powertube, because the angle and turbulence presents so much restriction... Therein lies the challenge, right?
It's actually going to be the exposed port area that is going to be the challenge. Look at the new trracer's ports and how little is actually exposed when the PT is back all the way. Maybe a little more than a 1/3... so 1/3 + 1/3 is less than the full area of the inside of the PT.

As I suggested before, if you can increase the travel of the power tube you can expose more of the ports. That could be a problem though because your hammer would need to sit further forward using the standard location of the face of the valve nut.

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Old 01-24-2011, 10:34 AM   #380 (permalink)
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One of you CAD guys could maybe do up a few models with different hole sizes and patterns to see how to get the most out of the inlet ports?
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Quote:
Originally Posted by Robertsr View Post
I don't so much make money, as provide a conduit for it's movement.
Mega Z for sale: http://www.mcarterbrown.com/forums/m...el-mega-z.html
Stock class = 12grams and a stick feed. End discussion.
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