FX CROWN POWER MODIFICATIONS

Forums PCP Airguns FX CROWN POWER MODIFICATIONS

  • Views : 3919
  • Link

    CHUCK
    Participant
    Member

    The way I solved the FX Crown AMP Regulator creep problem was to replace it with one of the new Huma Gen 3 Tuning Regulators. There are three models: 60-120 Bar; 100-165 Bar; and 140-195 Bar. https://www.huma-air.com/FX-Impact-and-FX-Crown-Tuning-Regulator-Gen-3 Replacing the factory regulator with the Huma completely cured the problem of it creeping up in reg pressure. This creep can be especially annoying when every time you take the gun out shooting you discover it is not hitting the same place as it was before, which makes you want to reset your scope zero every time you take it out shooting.

    Something odd I discovered about the FX Crown is that it has no hammer weight, so that if you plan on using the Huma High Pressure Regulator to set the reg pressure above 150 Bar you will have to modify the hammer spring guide and also add a hammer weight. Otherwise you can set the reg pressure higher and higher but without adding a hammer weight your pellets' velocity will not increase. You need the extra weight to open the valve pin against the higher regulator pressure.

    To do this I modified the hammer spring guide and made a 90 grain weight, and also reset the screw in the hammer adjuster block to allow the adjustment knob to be set on MAX at the 12:00 position. Bob_O made a very good instructional video on how to set the D5 screw and the hammer adjuster block as shown here: https://www.youtube.com/watch?v=uvTZ4cmYDO4.

    The combined length of the hammer weight and remainder of the guide rod on the spring guide cannot exceed the total length of the original spring guide rod, or the weight will bind against the spring guide rod and prevent the gun from cocking. If for any reason you wanted to use a longer heavier weight then you would have to shorten the spring guide rod accordingly, but I found that anything more than a 90 grain weight is unnecessary. 

    The new Huma Gen 3 Extra High Pressure Regulator ran flawlessly in the Crown and the creep problem was solved. At one point in my experiments I installed the .25 caliber slug liner and with the above modification and with the Huma set at 180 Bar I was able to get the JSB 34gr. MKI's running at 1015 ft/s for a whopping 78 FPE! Those 34's were Smokin'! And at that power level it will just stack pellets in the same hole at 50 yards! Who knows what this rifle and slug liner combination would do with some Varmint Knockers at that velocity and power level! ? :) 

    This Huma Reg installation – hammer weight/spring guide modification is very simple to do and is a big bonus to solving the reg creep problem.

    • This topic was modified 1 year ago by CHUCK.
    Link

    JohnL57
    Participant
    Member

    First-congratulations on fixing your issues with POI shifts.

    I'm glad I saw this post as I've been thinking about a Dreamline that also has the AMP reg. This would be the most I've spent on a gun and I'm shall we say a bit "economically challenged". If I were to spend the kind of cash FX is getting for their stuff and then have issues I might go a bit nuts! Think I'll wait a while to see how the AMP equipped guns prove out.

    Link

    BDX
    Participant
    Member

    I never found the creep to be a real problem in my Crown. It’s never budged from day one at 145-150. Maybe it’s the late model regulator they began putting in the newer Crowns. Can’t speak to the issues of earlier models but there was a gent on AGN who did some rearranging/restacking of the Belleville washers and came with a solid no cost fix for his. 

    Link

    ImpactX
    Participant
    Member

    Kinda misleading title. I was hoping for a fix on the reg creep that most fx guns have. You didn't actually fix the reg creep. You just replace the fx reg with the Huma reg. That's $120 extra. Was really hoping for a free fix and not have to spend $120 on a huma. Oh wells.

    Link

    CHUCK
    Participant
    Member

    Hi John, long time no see my friend! I think you would love the new FX Crown rifle, especially one with a slug liner and the power upgrade I described above. I absolutely loved this new synthetic Crown .25 – it is super easy to work on, and to a hunter like you it shoulders and points perfectly without any thought process involved at all! Its like an extension of your mind rather than a rifle in your arms… And to sweeten the deal FX has a "Value Priced" Synthetic model that is only $1349.99, and they are super quiet with just the shroud tube that pulls forward for maximum quiet without the need to add an expensive moderator. The one I had jacked up to shoot the 34 MKI's at 1015 ft/s / 78 FPE was with a 600mm barrel, and was as still as quiet as a mouse fart! I would recommend you get one now with the slug liner because you will then be able to shoot your 34 MKI pellets and your slugs out of one barrel without ever being bothered to change it back and forth. Check out the specs on it here: https://palmbeachairguns.com/product/fx-crown-vp/

    I give the Crown my highest recommendation to you John. You may remember that I had a .25 Streamline for several years that I modded to shoot the MKII at 61 FPE…well the Dreamline is basically just a Streamline with external adjustments, so I know you wouldn't ever be able to upgrade the power to shoot slugs with it like you could easily do with the Crown .25. For a problem free walk around offhand shooting small game hunting rifle this one is my top choice. 

    Link

    nervoustrig
    Participant
    Member

    ImpactX

    Kinda misleading title. I was hoping for a fix on the reg creep that most fx guns have. You didn't actually fix the reg creep. You just replace the fx reg with the Huma reg. That's $120 extra. Was really hoping for a free fix and not have to spend $120 on a huma. Oh wells.

    To fix creeping, the mating surfaces of the regulator’s valve seat need to be dressed dead flat, parallel, and polished free of any microscopic scratches.  It’s these scratches that allow air to slowly weep by and continue to elevate the plenum pressure. 

    Link

    CHUCK
    Participant
    Member

    Well for me the easiest way to fix the .25 FX Crown Reg creep problem was to take out the offending regulator and throw it in the trash, and then install a dependable reliable Huma Gen 3 Reg that does not have that creeping problem. With the added benefit of being able to turn the Huma regulator all the way up to 195 Bar, as opposed to the 150 Bar limit for the FX AMP regulator. (NOTICE – NEVER adjust the FX Crown regulator above 150 BAR as damage to the system may occur and will void your warranty!) Of course being able to set the regulator up to higher pressures is only important if you want more power to shoot the 34 grain pellets or especially more power to shoot all the new slugs. But if you are satisfied just shooting the 25.4 grain pellets at 47 ft/lbs and aren't concerned by the creeping problem it won't matter to you.

    Link

    928487381
    Participant
    Member

    CHUCK

    The way I solved the FX Crown AMP Regulator creep problem was to replace it with one of the new Huma Gen 3 Tuning Regulators. There are three models: 60-120 Bar; 100-165 Bar; and 140-195 Bar. https://www.huma-air.com/FX-Impact-and-FX-Crown-Tuning-Regulator-Gen-3 Replacing the factory regulator with the Huma completely cured the problem of it creeping up in reg pressure. This creep can be especially annoying when every time you take the gun out shooting you discover it is not hitting the same place as it was before, which makes you want to reset your scope zero every time you take it out shooting.

    Something odd I discovered about the FX Crown is that it has no hammer weight, so that if you plan on using the Huma High Pressure Regulator to set the reg pressure above 150 Bar you will have to modify the hammer spring guide and also add a hammer weight. Otherwise you can set the reg pressure higher and higher but without adding a hammer weight your pellets' velocity will not increase. You need the extra weight to open the valve pin against the higher regulator pressure.

    To do this I modified the hammer spring guide and made a 90 grain weight, and also reset the screw in the hammer adjuster block to allow the adjustment knob to be set on MAX at the 12:00 position. Bob_O made a very good instructional video on how to set the D5 screw and the hammer adjuster block as shown here: https://www.youtube.com/watch?v=uvTZ4cmYDO4.

    The combined length of the hammer weight and remainder of the guide rod on the spring guide cannot exceed the total length of the original spring guide rod, or the weight will bind against the spring guide rod and prevent the gun from cocking. If for any reason you wanted to use a longer heavier weight then you would have to shorten the spring guide rod accordingly, but I found that anything more than a 90 grain weight is unnecessary. 

    The new Huma Gen 3 Extra High Pressure Regulator ran flawlessly in the Crown and the creep problem was solved. At one point in my experiments I installed the .25 caliber slug liner and with the above modification and with the Huma set at 180 Bar I was able to get the JSB 34gr. MKI's running at 1015 ft/s for a whopping 78 FPE! Those 34's were Smokin'! And at that power level it will just stack pellets in the same hole at 50 yards! Who knows what this rifle and slug liner combination would do with some Varmint Knockers at that velocity and power level! ? :) 

    This Huma Reg installation – hammer weight/spring guide modification is very simple to do and is a big bonus to solving the reg creep problem.

    Hello, I installed the HUMA gen3 regulator and I found that the climb problem has not been resolved.  Can I know the stacking order of your disc springs?

    I also want to know, strengthen the spring hammer, his length width.  There is also weight.  thank you

    Link

    edosan
    Participant
    Member

    Usually the creep is due the plastic piston, with a metal piston on the reg, problem solved (in huma is metal). 😉

    Link

    pepperchops
    Participant
    Member

    Why doesn't FX fix their regulator problems? These are expensive guns and FX should have the resources to get it done!

    Link

    tsmith
    Participant
    Member

    so what else can cause the “need to fire a couple shots” after letting my wildcat sit for a while problem?

    i replaced the stock reg with a huma and still have this issue.  

    the huma DID FIX the inconsistent shot strings.  but after the first couple shots.

    Link

    CHUCK
    Participant
    Member

    The fitting instructions for the Huma Gen 3 Impact/Crown regulator are found on the Huma website under the heading "Fitting Instructions". Just scroll down to the FX section and you will find it. Each model shows how to stack the Belleville springs correctly. http://foto.huma-air.com/foto/Installation%20guide%20FX%20Impact.pdf

    Link

    CHUCK
    Participant
    Member

    You will see in the fitting instructions that it says:

    "Applying the valve disk: In between the piston and the setscrew a very tiny 4 mm delrin valve disk needs to be placed, see pictures above. Mark one side of the disk with a black marker. You can place the 4 mm valve disk into the regulator body and push it down until it is flat on the tip of the setscrew. Use a non sharp, blunt tool to push it down so it does not get scratched in any way. Now you can push the two regulator parts (regulator body and piston) together. You will feel a bit resistance when it slides into the o-ring and it will be clamped slightly. As the piston with the Belleville washers are just hold by a single o-ring. It can easy fall out when you hold the regulator upside down."

    Maintenance:

    "Inside the regulator there are 3 o-rings. They can be removed by using some dental tools and also replaced with a blunt dental tool. We use a small piece of 4 mm plastic rod, 10,5 mm long, to place them. Due to the size of the reg, you would probably need some patience to change them. See the pics above for the positions. The inner part of the housing is not very vulnerable for scratches, but of course be careful and do not use force. The set screw is not displayed on the picture. (When a regulator creeps up in pressure, the main issue is probably a damaged valve disk. Also when you have tried to lower the regulator pressure while under pressure, the disk is probably damaged and needs replacement. A creeping regulator can often be solved by flipping over the disk to the other side."

    Link

    CHUCK
    Participant
    Member

    So it is possible for you to cause your Huma reg to creep by damaging the white valve disk when either putting it together incorrectly, or by screwing the set screw too far in when you initially put it together or later when adjusting it down. When putting it together and when later turning it down you must never turn the adjustment screw down so far that it damages the disk. Only adjust the screw down until it just barely touches the disk and that will be about 50 Bar on your gauge, then turn it counter clockwise to increase the reg pressure from there. So for the person who says their Huma reg is creeping I advise you to take it apart and flip the disk over and put it back together carefully so as not to damage the disk. 

    He ships these regs with several replacement disks for just this reason.

    Link

    2D1C
    Participant
    Member

    I have been thinking on getting the HUMA for my .25 Crown, but my piston is 11mm long not 14? washers are 8mm Any thoughts? Miss print? Can I use the 14mm one?

     

    Dennis

    Link

    CHUCK
    Participant
    Member

    From the Huma website:

    "For the FX Crown we have 3 models replacement regulators available, please select the correct model based on your factory regulator dimensions:

    Gen 1 : Factory regulator with a 14 mm long polymere piston and 8 mm diameter belleville springs. (Not very common in the crown)
    Gen 2 : Factory regulator with a 16 mm long polymere piston and 8 mm diameter belleville springs.
    Gen 3 : Factory regulator with a 16 mm long polymere piston and 10 mm diameter belleville springs (current model with serial above about 180760)"

    Your FX Crown reg will be like one of the FX regs listed above. Makes you wonder how many tries it will take before FX ever gets it right…or better yet just installs the Huma's at the factory and be done with all these problems. We are forced to pay a hell of a lot of money for these FX guns and we should not have to modify them like this to make them reliable.

    Link

    2D1C
    Participant
    Member

    I'll re measure. I have 2 and replacement BW's so I don't have to take the gun apart.

    Link

    Bob_O
    Participant
    Member

    CHUCK

    We are forced to pay a hell of a lot of money for these FX guns and we should not have to modify them like this to make them reliable.

    CHUCK,

    You make it sound like FX air rifles are unreliable unless equipped with a Huma reg.  Notice how I didn't type "modified".

    Just because you have an arrangement with Huma-Air doesn't mean the next person can't have a reliable FX air rifle with a factory reg.  My Crown with AMP reg is performing at very high levels.

    No one actually "forced" you to pay did they?

    Link

    ImpactX
    Participant
    Member

    Bob_O

    CHUCK

    We are forced to pay a hell of a lot of money for these FX guns and we should not have to modify them like this to make them reliable.

    CHUCK,

    You make it sound like FX air rifles are unreliable unless equipped with a Huma reg.  Notice how I didn't type "modified".

    Just because you have an arrangement with Huma-Air doesn't mean the next person can't have a reliable FX air rifle with a factory reg.  My Crown with AMP reg is performing at very high levels.

    No one actually "forced" you to pay did they?

    True no one is forcing us to buy the Huma reg with a gun pointing at our face. But in a way we are force to folk up the $120 to stop the reg creep. Fx fan boys will defend fx guns. Only fx gun I own is the impact x. I'm not really into their guns cause they are in the thousands of dollars. I'm more a Benjamin guy. Own a mood, prod, and discovery. I've spend $2000 on my impact. I expect a gun that doesn't require me to shoot 2 shots every hunt or shooting session. My impact x brand new with amp reg gen 3 creeps from 140 bar to 150 when I first got it from airgun depot..folks say it I'll break in..been 5 months now and over 6 tins and it still creep. It's very annoying. I tear down the reg..clean it, lube it, even flip the bevels around and double stack them. Still creeps. It forces me to folk up $120 for a Huma reg. Paying $2000 we shouldnt even have to spend another $120. Some use excuses like it's not safety concern so it's no big deal. Well when you spend $2000 it is a big deal. Their reg sucks and their gauge sucks..both my gauge don't even match once it goes below set reg and don't match my CF tank. It's known fx gauges and reg are crap. Fx needs to get off their butt and fix them or install Huma reg and wiki gauge in all their guns since it seem like they aren't doing a good job at it.

    Link

    nervoustrig
    Participant
    Member

    I’m certainly in agreement that one should not have to fix the regulator in a $2000 gun…or even a $700 gun.  I didn’t mind it too much on my $200 Dynamic .25 cal, and fortunately was able to fix it so I can pick it up on Saturday morning after it has sat idle all week, and go outside and put a JSB through the brain of a squirrel at 60 yards.  I’d be a little salty if I’d paid 10 times that much though.

    BTW, cleaning the regulator internals and reconfiguring the Belleville stack will not remedy creeping.  As I replied to your question yesterday, the valve seat needs to be dressed. 

Viewing 20 posts - 1 through 20 (of 49 total)

You must be logged in to reply to this topic.