brass impact regulator piston
- Thread starter douger
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Not yet, I just emailed fx usa and asked them to invoice me for 2 of the new brass pistons for the impact m3. When they come in I will post a part number for everyone
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I would give them this number. Both of mine shipped was almost $30. I installed mine today, so far so good.
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The coefficient of linear thermal expansion of the Delrin piston about 5x that of the regulator body.
Whereas that of the brass piston more closely matches that of the regulator body (I.e. they expand and contract equally).
Whereas that of the brass piston more closely matches that of the regulator body (I.e. they expand and contract equally).
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Could you post some tables with these figures? I am interested in thermal expansion of different materials. Maybe steel will be better than brass in than manner.
I think FX design is not the best one. That delrin part should be as thin as possible:
So that it does not change its dimensions drastically under temp. range.
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Coefficients Linear Thermal Expansion
Coefficients Linear Thermal Expansion is the tendency of matter to change in volume in response to a change in temperature, through heat transfer.
www.engineersedge.com
Steel's coefficient is fairly low...a little less than brass. But bear in mind the goal wouldn't be to minimize this property, it would be to match it to that of the regulator body so the piston and regulator body grow or contract at the same rate. Given regulator bodies are typically something like aluminum or stainless steel, brass is a pretty good match. Delrin/acetal on the other hand is vastly different.
A little unconventional the way it sticks out like that but it's such a small part, its length will change only an infinitesimal amount due to temperature. Contrast that with the entire piston being made of Delrin.
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The body of the regulator piston is just an aluminum block. Looking at the critical parts:
Both the nozzle and the piston are influenced by thermal expansion. If the temperature is lowered then both become shorter. The effect is similar to unscrewing regulator adjustment screw. However, delrin's dimensions are influenced like 5x more than brass. I would take FX brass piston and remove the excess of delrin material. I would eventually replace delrin with peek which seems to have lower linear coefficient of expansion.
But I think there may be a problem with delrin thickness reduction as there seem to be a hole in brass right below that delrin piece:
It seems delrin sticks out. What a poor design. C'mon FX! I understand they made it to improve reg service time - easier to replace delrin part.
Both the nozzle and the piston are influenced by thermal expansion. If the temperature is lowered then both become shorter. The effect is similar to unscrewing regulator adjustment screw. However, delrin's dimensions are influenced like 5x more than brass. I would take FX brass piston and remove the excess of delrin material. I would eventually replace delrin with peek which seems to have lower linear coefficient of expansion.
But I think there may be a problem with delrin thickness reduction as there seem to be a hole in brass right below that delrin piece:
It seems delrin sticks out. What a poor design. C'mon FX! I understand they made it to improve reg service time - easier to replace delrin part.
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PEEK is a good choice provided you smooth and polish both sealing faces, else it is apt to creep like crazy.
However its coefficient of expansion won't make any meaningful difference compared to Delrin because the dimensions are so small.
However its coefficient of expansion won't make any meaningful difference compared to Delrin because the dimensions are so small.
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Finally got off my lazy ass and installed my brass regulator piston today in my impact, seems to be working great and holding pressure rock steady. Is it me or the regulator with the new brass piston actually fill the plenum MUCH faster?
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yes the refesh rate will be greater for sure its more for higher power they say but the refresh rate is better faster for faster shooters lol
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Yes I noticed mine refilled faster also. But I can barely hear mine refill anyway. So far the brass pistons are working great for my m3
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