[nickydp33]

looking forward to see what comes out of this

[A.E.D.paintballer]

if i can find a ported traccer barrel locally i will do a decibel test then an acuraccy test

[brycelarson]

A.E.D.paintballer, on Dec 19 2008, 03:33 PM, said:

if i can find a ported traccer barrel locally i will do a decibel test then an acuraccy test

here's the deal - simply testing a ported v a non-ported barrel won't guve us the answer we're trying to find. Take, for example, the two Trracer barrels I've owned. The stock one was aluminum. It was non-ported, 14" long and the bore was gigantic. The ported barrel I have was a TASO eliminator. It's a steel barrel, ported, much smaller bore and 12" long. Shooting those next to each other will tell you which barrel shoots better - but then determining what factor made that barrel shoot better is going to be very tough.

If you have two identical barrels - one ported and one non-ported - that's the rig we need to test this.

[A.E.D.paintballer]

machining porting?

[brycelarson]

A.E.D.paintballer, on Dec 19 2008, 07:37 PM, said:

machining porting?

yes, this is something we talked about. taking a non-ported barrel and shooting it, adding porting, shooting more, repeat would certainly be a great test.

[A.E.D.paintballer]

ill see what i can do

[BryanDragan]

very good test tbh only benefits i can think of porting is making it quieter..while non porting helps rain play.

[NeCaNeS]

What I have found it does not affect it that much and I have used rifled barrels and by what I have seen was that a rifled barrel will increase accuracy to some extent.

[rkremer]

It would seem that in order for porting to have a major effect, there needs to be a "good" paint to barrel match or "underbored" situation. Either that or have massive porting holes. The air pushing the paintball is going to take the path of least resistance. It's just like when a marker fires, the air pressure in front of the paintball is much less than the gas coming from the valve (atmosphere pressure is apprx. 14.7 psi, vs the operating pressure of your marker) and provided this pressure is enough to overcome the friction between the paintball and the barrel, the paintball will be pushed down the barrel. Likewise, in order for air to be vented by the porting, it must be easier for the gas pushing the paintball to go through the porting than keep pushing the paintball. So either it must be somewhat difficult to push the paintball (tight paint to barrel match) or there are huge porting holes that allow the gas to move freely through them.

As far as I understand it, the great potential of porting is that it can decrease the pressure difference between the front and the back of the paintball before it leaves the barrel. Presumably, if there's still a high pressure behind the ball when it leaves the barrel, the gas will rapidly expand behind/around the paintball. This expansion is likely to be turbulent, and turbulent flow is fairly unpredictable, aka inconsistent. So if there's a large pressure behind the paintball when it leaves the barrel, this turbulent expansion will not only vary from shot to shot, but it will be strong enough to affect the flight path of the paintball, which will decrease the accuracy of the marker. By decreasing this pressure difference at the end of the barrel with effective porting, the expansion will be less forceful and should affect the flight path of the the paintball less --> greater accuracy.

This post has been edited by rkremer: 26 December 2008 - 01:20 PM

[rkremer]

By the way, I have a ported, stock 11" trracer barrel

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[Epshot]

um.
how about just covering the porting?

sure it won't to be exactly like having no porting, but if the argument is that it allows to air to escape and keep from becoming turbulent ala Palmers argument(which i hope is correct since i coughed up an extra $45 for porting)
Then simply covering the porting with electrical tape(which will peel clean) should be enough for testing.

[brycelarson]

Epshot, on Jan 5 2009, 01:57 PM, said:

um.
how about just covering the porting?

sure it won't to be exactly like having no porting, but if the argument is that it allows to air to escape and keep from becoming turbulent ala Palmers argument(which i hope is correct since i coughed up an extra $45 for porting)
Then simply covering the porting with electrical tape(which will peel clean) should be enough for testing.

we've talked about this before - and the thing that would not change is the fact that the inner surface would then have essentially dents in it - which we don't know the effect of. It would be sorta like shooting an internally dimpled barrel.

[Epshot]

the problem with a dimpled ball is primarily the fact that after a ball exits the barrel it creates an unstable spin, which is why when you shoot them, they may go straight for 15ft then curve off radically in any given direction(at least thats been my experience with them.

I would find it hard to believe that at the end of the barrel they would have much affect.
Besides i'm just talking a quick test, its easy enough to order a 12 inch ported and non ported barrel from Palmer Pursuit shop.

If someone wants to donate a 12 non ported palmers i'll be more than happy to compare it to my ported barrel

[Troy]

We are over complicating things again. Who has a stock barrel without porting they wish to screw up, and a drill press? We aren't going for accuracy here, it doesn't matter too much if the ports are perfect. Drill your hole, sand down the barbs, then test.