FX FX Crown MKII regulator issues

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sobdiver

Member
Dec 25, 2020
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St. George, UT
I have a fairly new FX crown continuum .22. The first time I tried to adjust the regulator it started leaking. I sent the gun into UA for warranty and they resealed the regulator and replaced the piston. Here’s what the gun/regulator is currently doing and I wanted to know if this is to be expected: I have the regulator set at 140 bar. When I fire a shot it will immediately drop close to 10 bar. If no more shots are fired it will slowly rise back to 140 bar (could take a couple of hours). The regulator isn’t creeping, because the reg will stop rising when it reaches the set point and go no further. Depending on the tune, the first shot (at 140 bar) could be a much lower FPS than subsequent shots (130-135 bar). I have the new rear power adjuster that goes from 1-23. If I reach maximum FPS at power wheel setting #15 and I set the wheel at number 16 then it’s less sensitive to changes in the regulator setting. However, if I shoot below #15, big FPS drops can be seen as the regulator rises back to 140 bar. I should also mention that the 140 bar set point is achieved when the bottle is full or nearly full. If the bottle is only at 200 bar for example the reg might only get to 135. It seems like I have a good work around with the tune (setting the power wheel 1 click above where it maxes out FPS), but that certainly doesn’t seem ideal. In my case the tune with the 380mm barrel is medium, power wheel 16, 18.1 pellets at about 870fps. Anyway is this normal behavior for an FX regulator? If I have a good tune work around I’m inclined not to worry too much about it, but wanted to reach out for some feedback.

(I’m also having a different issue with each barrel, but will need to save that for another post.)
 
Hi,
My experience with my Crown MkII in .22 with a 380mm barrel is that 140 bar is too high. It is definitely way too high if you are using the the stock hammer configuration. I don't know what is normal on a Continuum, but I suspect you have the 11 gram hammer weight with the 1 mm thick head. That weight with the hammer can not provide enough energy to consistently open the valve at 140 bar. I use the 13 gram brass Huma hammer with a 4 mm head and am shooting the JSB 18.1's at 890 (with ES of 7 and SD of 2) at 130 bar, PW=15, and internal hammer spring screw 5 mm out.
As to the reg dropping 10 bar on the first shot, then taking hours to get back to 140. That is the definition of reg creep. You are not really set at 140, you are set at whatever the reg returns to between shots. The reg then creeps to 140 before finally sealing. (When you set the pressure, you should dry fire a couple of times to see where the reg returns to - often it is not where you set it). I would expect the culprit for this is the delrin seat of the reg piston. It may be dimpled. Easy to fix. Look at Sub12Airgunners YouTube channel for the video of him tweaking the AMP regulator.
Good luck with your tune, and be sure to check out Sub12Airgunners. It is my favorite airgun site.
Cheers,
Greg
 
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Thanks for the good feedback. Let me add that when I received my FX Crown Continuum in September the first thing I did was to shoot over the chronograph with the factory settings. The first shot was 50fps lower than the next shot – straight out of the box. After the regulator started leaking and I sent to UA for warranty I also immediately shot over the chronograph upon return of the gun. First shot about 40fps lower than the next shot. (Warranty repair was replacing the regulator seals and regulator piston) So, this has been the behavior of the gun since day one. It’s never not done this with both a brand new regulator as well as a repaired regulator. I explored Sub12Airgunners Youtube channel. Lots of great content and I subscribed, but I didn’t quickly find which video shows a fix for this issue. In any case, it sounds like a new FX regulator shouldn’t creep or a newly repaired FX regulator shouldn’t creep, right? It doesn’t seem like this is something I should have to invest a lot of time trying to figure out on my own with a brand new gun.
 
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nervoustrig said:
In most cases, a new regulator can be expected to creep. It will then improve after a break-in period, during which the seal takes on an imprint of the valve seat.

From there, it should behave well for thousands of shots. Then eventually the seal will wear to the point where creep begins showing up again.
Click to expand...
Well that’s certainly some good news! Hopefully that will be my experience.
 
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Hi Again,
I have to admit that I generally ignore the first couple of shots after the rifle has been sitting for more than a couple of hours. Once it gets past that I start taking data. So my great ES and SD don't include those shots;). Both of my Crowns are such sweet shooting rifles that I can forgive some small flaws.

The Sub12Airgunners episode on the Amp regulators is
.

Another two you should watch are his ones on tuning the Crown. He (Really they as it is a father-son team, one of whom is Geoff) is limited to 12 FPE by law in the UK, but the principles he is showing apply to any power level. The first of those episodes is

Have fun with your Crown and hope you enjoy it as much as I have.

Cheers,
Greg
 
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NAProf said:
Hi Again,
I have to admit that I generally ignore the first couple of shots after the rifle has been sitting for more than a couple of hours. Once it gets past that I start taking data. So my great ES and SD don't include those shots;). Both of my Crowns are such sweet shooting rifles that I can forgive some small flaws.

The Sub12Airgunners episode on the Amp regulators is
.

Another two you should watch are his ones on tuning the Crown. He (Really they as it is a father-son team, one of whom is Geoff) is limited to 12 FPE by law in the UK, but the principles he is showing apply to any power level. The first of those episodes is

Have fun with your Crown and hope you enjoy it as much as I have.

Cheers,
Greg
Click to expand...
Nice videos, thanks! Imagine buying a gun like the crown and having to shoot below 12FPE. Maybe also buy a Ferrari and cap the speed at 40MPH lol
 
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