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Old 07-02-2013, 01:07 AM   #1 (permalink)
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My promaster is a blender, how to make my blendtec, an ICD again.

So.. my promaster is eating paint.

I'd love for ideas on what to check. My current guess is that my LPR pressure is to high and I'm doing "next ball in the stack" chops.

I have it fed with a good reg, and a empire magna.
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Old 07-02-2013, 01:22 AM   #2 (permalink)
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what kind of condition are your detents in? Your balls may be rolling forward and allowing the next ball to slip in. Also, adding a small radius to the front of your bolt with some fine sand paper or a fine file helps with chops of this nature. If you can, turn down the tension on your hopper as well.
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Old 07-02-2013, 09:41 AM   #3 (permalink)
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where is the broken paint? is it in the breech, feedneck or barrel? the place where the paint is, leads you to what is wrong.

reset the reg pressures, and load in a couple of balls, like 10.
check to see if the eyes are on and working.
with the barrel off, see if the loader is pushing the paint passed the detents.
physically check to see if there isn't anything obstructing the breech.
check your barrel for anything(or shoot it on a different gun) that shouldn't be there.
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Old 07-02-2013, 11:17 AM   #4 (permalink)
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I'll be replacing the detents, as that's been suggested twice. I wonder why this becomes a problem more at speed. Usually the faster you shoot a gun, the less the detents matter.

The paint is breaking in the breach. The whole barrel gets coated, and paint ends up inside the bolt and coming out under the eye covers.

I use the same barrel (Evil pipe) on my mag, cocker and promaster. The barrel is fine. And doesn't break paint in the mag, or on a cocker.
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Old 07-02-2013, 03:33 PM   #5 (permalink)
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check to make sure that your hammer is screwed all the way on and that the bolt clears the breech when aired up, as well.
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Old 07-03-2013, 09:34 AM   #6 (permalink)
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I'll be replacing the detents, as that's been suggested twice. I wonder why this becomes a problem more at speed. Usually the faster you shoot a gun, the less the detents matter.
unless you have an unsprung ram, the bolt is forward, already pushing on the detent springs, weakening them. so, when you are shooting, the springs won't return as fast, nor hold against the force of the hopper(which is pushing against them), so it will result in paint that could be part way in the breech, giving you that chop.

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The paint is breaking in the breach. The whole barrel gets coated, and paint ends up inside the bolt and coming out under the eye covers.
when you only shoot one ball, its easier to tell where the paint is breaking than multiple shots, which i can tell, as one chopped ball doesn't result in paint coming out from under the eye covers.

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I use the same barrel (Evil pipe) on my mag, cocker and promaster. The barrel is fine. And doesn't break paint in the mag, or on a cocker.
that's good. you eliminated one potential culprit to breaking paint.

now, are you sure that the eyes are working? what board are you using? you could think that the eyes are on, when they are off. the easiest way to check is, turn on gun, without barrel or air, and pull trigger with and without your finger or something to block the eyes. if the noid clicks without blocking the eyes, then the eyes are off or not working.
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Old 07-03-2013, 11:14 AM   #7 (permalink)
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The eyes are working. Verified on the day of play. (I forgot to turn the hopper on)

Iv'e had the ball blow up on a single shot too. It's always in the breach.

The weak detent springs seem to be the most likely cause. I bought the gun as NOS a few years ago. and it sits degassed most of the time, meaning bolt forward and compressed detent springs.

where canI get new detent springs?
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Old 07-03-2013, 11:48 AM   #8 (permalink)
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New springs are probably best, but there is some room in the detent covers for some small shims. You can use anything you can find, somewhere between 1/16" down to about 1/32" thick and that you can find or cut to the right diameter.

I shimmed mine with some rubber sheet pieces, and they are almost too tight.
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Old 07-03-2013, 10:55 PM   #9 (permalink)
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Is paint getting up in the feedneck & your loaders neck? While we're on the subject, what kind of loader are you using?
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Old 07-04-2013, 01:08 AM   #10 (permalink)
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No, the paint isn't really getting up into the feed neck.

It's an empire magna.

I'm really starting to think it's the detents...

Now the next thing to tackle will be gas efficency. Which, as it stands, blows.
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