You have a part number, sir?Thanks douger, I just emailed fx usa and they are sending me 2 of the new brass pistons. Almost $30 shipped for both of them.
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You have a part number, sir?Thanks douger, I just emailed fx usa and they are sending me 2 of the new brass pistons. Almost $30 shipped for both of them.
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 everyoneYou have a part number, sir?
I would give them this number. Both of mine shipped was almost $30. I installed mine today, so far so good.Wounder why i was told 19696-b. Never did get an invoice. Guess i get to call again.
Any idea why a plastic piston is so much temperature dependent?The main thing I'm looking to get from a brass piston is reduced set point shift due to temperature changes. It's very noticable on the plastic piston. 70deg F to 40 deg F is around 10 bar change on my M3. Other than that issue, the plastic piston works great and it has the advantage of not needing a separate sealing surface material.
I wonder if they will offer the brass piston as a "200 bar upgrade package" that includes a full stack of 0.6mm belleville washers. Huma uses that for their 200 bar setup. The default AMP stack is 50/50 0.5mm and 0.6mm washers. I suspect 200 bar may be pushing the hybrid spring stack a bit too far.
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.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).
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.
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.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.
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.
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 m3Finally 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?