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Hey all, i havn't been scanning this forum in a while so i wasn't sure if this topic had been covered yet or not..I had discussed it with others on here but never got a definate answer..My older version imagine seems to be blowing air back up into the feed neck and causing hopper breaks, and possible chops i suppose..I have a Icon feed neck, halo TSA, and ACS bolt..what do i need to do to test this (toilet tissue trick?) or what?..also what do i need to do to fix this problem..only happens about every once and a while..thanks -D-
 

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what he said

Badinflewinse said:
Air is going to get into your hopper since it is a blow back.

Don't know if you can reduce it. Try making sure all the o-rings are good, and thats is clean and oiled well.

what he said i dont think theres too much u can do but like u said it doesnt happen to often.
 

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they got it its a blowback so air will get in there maybe make sure you use new balls every time maybe you have been using brittle balls in your back yard i dont know but yea if it only happens every noce in a while it will be a drag but a drag youll have to livw with none the less
 

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Yea thanks for all of the info guys. Someone said something about the O'rings, but where you talking about all of them in genereal, or the ones on the bolt, cuz i have the ACS delrin and it doesn't have them. Also i was infact using some older version paint, and it was some practice paint..thats prolly my problem..thanks again..-D-
 

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Ahmadi6490 said:
You can turn it into a suction device. It's just having the right setup..barrel, valve, bolt, reg....
What??? Ahmidi - you will have to explain that one more....

There are a few tricks that you can do to reduce the blowback into the hopper. One is to get a powerfeed hopper such as the halo.. this makes it so all the air in the world can go whizzing up the feedneck and it will not affect the paint in any way. Kind of an expensive fix for something that is not really that much of a huge problem in the first place.

The other is to drill two or more small holes in the feedneck. This allows another avenue for the air to escape and ostensiably reduces the blowback into the hopper. You will note that most 3rd party hopper elbows have holes in them just for this reason.

Blowback is somewhat of an endemic problem with STBB markers... something you may just have to live with.
 

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Is your ACS bolt the kind with a spring inside to help prevent pinching? I wonder if that spring is too weak? If it is slightly too weak the front 1/2 of the bolt may be blowing back slightly due to the pressure buildup behind the ball before it moves causing excess blowback. If the ACS spring is very weak, the front 1/2 may not be moving all the way forward due to inertia before the striker hits the valve pin. This would also cause excess blowback. This is all theory but who knows, it might be the problem. It might be worth testing it against your stock bolt to see which one causes more blowback.
 

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I don't believe that the suction theory is even possible. In order to pull PBs down into the breech, you will need to reduce the breech pressure below the ambient air pressure in your hopper. It is highly unlikely that the pressure inside the barrel/breach will drop below this at any point even considering Bernoulli's principle. The best you could do would be to add an O-ring to the very front of the bolt to prevent any backflow into the feedneck, but it would get ripped up pretty quick.
 

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I read the suction post and I agree with Javaman. You can reduce the blowback, that is for sure, but I don't see where you are introducing negative pressure anywhere at all. The guy also reccomends "swelling your o-rings" with WD-40... well the only problem with that is that WD-40 has a penetrating and drying agents in it that will destroy your o-rings. So I very much doubt the credibility of this poster's information.

Just get a powered hopper, make sure the marker is properly oiled (with a PB rated oil) and live with the minor amount of blowback that you get.

In terms of getting higher airflow, there are a few tricks that can help. One is to drill out the holes in the ASA to a slightly larger diameter. Or you can purchase an assualt block like the 45* block that has larger ports in it standard.

Removing the venturi in your bolt also helps.. Basically if you go to Otter's site, look for the "converting to LP" threads. LP = more airflow. So if you get a high flow valve, drill out the asa, and do those other tweaks from OSC, then you will have more airflow.
 
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