The Huma one kind works like you are talking. It clamps over the carbon sleeve with 6 screws. That is fastened to the extended scope rail. I can take a pic of it later today to show you how it works.
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FX Impact M3 .357, in the search for more umph
- Thread starter 7Green
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I have found that a tungsten with a larger head and the 52mm spring is more powerful. Currently shooting 62-grain varmint knockers 1110FPS for 170FPE. I also drilled out my transfer port and bought a .30 caliber ernest rowe dual transfer port.
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You can add 2 Bellville washers and the brass piston to the amp reg on the impact, I've had mine at 210 Bar for 6 months with no problems.
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I have no data on the 30mm setup. I can only attest to the power gains I observed with the 35 cal. My current setup is far more powerful than it was with the factory springs and upgraded hammer. Previously, I actually lost speed because the hammer wouldn't throw a 33 gram hammer as hard as a 30.5 gram hammer. I exhausted 1000's of rounds testing all kinds of hammer weight setups. My previous setup launched 81 jsb's at a peak of 935 to 940 fps. The results of my current setup show far more power than previously.
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Forgot to mention, I have the power block installed now too. My current set up is
-huma extra hp 2nd reg
-huma power springs
-tungsten hammer weight with 19.5 gram hammer. Total assembly weight was 33.16 grams. New is 32.2 grams. Not tested yet for speed on the new setup.
-huma dual transfer port
-nsa probe
-huma extra hp 2nd reg
-huma power springs
-tungsten hammer weight with 19.5 gram hammer. Total assembly weight was 33.16 grams. New is 32.2 grams. Not tested yet for speed on the new setup.
-huma dual transfer port
-nsa probe
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Without changing my 2nd reg pressure (155 to 160 bar) when I first tested the new setup. 93nsa's shot out at 930fps. Previous was in the 860's. I also did not test each individual part. I put them all in and tested it, since I had the whole gun apart.
With my old setup, 160 to 165 bar was all the hammer assembly could open then.
With my old setup, 160 to 165 bar was all the hammer assembly could open then.
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Just one question.
If with previous setup you already have taken coyotes farther away 200 yards, with new setup what distance would be your goal?
If with previous setup you already have taken coyotes farther away 200 yards, with new setup what distance would be your goal?
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It all depends if I can get the same accuracy honestly. Right now, it isn't happening. I am hoping the bc shroud/barrel tensioner will help fix this as I think it has more barrel whip. It was already noticeable before, but it was accurate.
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I haven't spent any time tuning the new setup either so who knows. I am busy just installing and testing various setups to see what hammer weight dimensions give peak results and peak adjustability. Too many manufactures just make big heavy hammers, but never contemplate if it is too heavy and if it takes away too much adjustability. Ideally, you want full compression of the hammer spring with full function of the micro dial. Then you want the correct hammer weight to open your valve at the highest pressures your valve allows. This doesn't mean the gun will be set there, just that you have a wide range of power levels and have more room to fine tune it.
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Does your power block have any oring in the channel where the barrel is inserted?
What is your barrel length? In my case, 500mm barrel, 27g (hammer plus weight) is enough to open the valve at 175 bar and it has enough dwell. I use Huma hammer spring. My valve return spring is at 2 lines with original spring
What is your barrel length? In my case, 500mm barrel, 27g (hammer plus weight) is enough to open the valve at 175 bar and it has enough dwell. I use Huma hammer spring. My valve return spring is at 2 lines with original spring
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Here is what the Huma barrel stiffner looks like. When you tighten down all 6 bolts the carbon fiber tube can't be moved and it holds the barrel tightly also. 
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@Seeker
I will have to look at the power block tomorrow. I have an 800mm barrel and I also use the huma power spring.
I am running an assembly in the 32 to 33 gram range. I never did any testing with the huma spring alone either. With the factory spring, the best weight hammer assembly for my gun was 29.5 to 30.5 grams. I could only open the valve somewhere in the 155 to 165 bar range.
I am sure every gun is slightly different just from machining tolerances and stiction of the o-ring and delrin valve. If I recall, didn't you change to a peek valve?
I will have to look at the power block tomorrow. I have an 800mm barrel and I also use the huma power spring.
I am running an assembly in the 32 to 33 gram range. I never did any testing with the huma spring alone either. With the factory spring, the best weight hammer assembly for my gun was 29.5 to 30.5 grams. I could only open the valve somewhere in the 155 to 165 bar range.
I am sure every gun is slightly different just from machining tolerances and stiction of the o-ring and delrin valve. If I recall, didn't you change to a peek valve?
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Do you happen to know the inside diameter of the tensioner huma supplies? Curious if a 14mm od tube would slide in it.
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The Huma carbon fiber tube is 14mm id and 20mm od. Also the Huma has a threaded cap that goes on the end of the barrel and cf tube to tighten them down. It has the 18m/1 thread so you can put on what ever moderator you would like on it. So noise isn't a issue.
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I would be curious to know how much louder it is without the shroud. I would imagine the shroud adds a little to stiffness too.
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