Modified Etac-Reg
Well because my new lathe is a little late on showing up I figured I would make another etac-reg with a collar for more volume. Can’t make what I will make until the new lathe shows up in the next couple of weeks. I made this one about .187 wider to see how much difference it makes. All I know is that my new .22 condor I built shoots kodiaks in the 970’s with a standard etac-reg and 2500 psi reg. With modified etac-reg and 2000 psi reg it shoots in the mid 960’s to low 970’s. I have the 2000 on a 53 ci tank and the 2500 on a 62 ci tank. I get more shots with the 2000 reg on the 53ci tank. I will pressure test this one to 4500 psi in a bucket of water after I weld it together tomorrow. It is .180 on the top and the sides are .140 thick. The most it will see is 2500 psi and I don’t think I will need more than my 2300 psi to get the .25 kodiaks to 950 fps or so. Going to go down to 1800 psi for the .22 I think.
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Thanks. I still have one to finish. I was going to make them all the same size but everytime I made one I went a little bigger. The large assembled one will end up with a 4500 psi to 2800 psi and a 4500 psi tank. I think I can make a setup that will produce 25-30 regulated 100 fpe shots.
WOW! looks great , nice to see more people have fun with there guns & workshop.
Gives you a good feeling when it shoot nice, after a lot of work and trail and error. 😎
I think there is a lathe attachment for grinding automotive valve stems and that would work great to radius the weld area for a smooth finish.
doug,
with no plans for production, you sure like to tease us with your handy work, huh?
damn exhibitionists… 😯
I took one up to around 4300 psi. The last one I made only has 1530 psi in it. They are .160″ thick on all sides and the weld just keeps it in place and seals it.
Do you pressure test these after weld up ?
Here’s 2 more that are a little bigger yet.
Built another one slightly larger and reshimed a reg. Didn’t have anymore thin shims so the best I could do was 1530 psi. On .25 it shot JSB’s around 936 fps. In .22 it shot kodiac’s around 955 fps and JSB’s around 985 fps. I’m thinking 1100 or 1200 psi reg to get the JSB’s down to around 920 fps and 1400psi for .25.
Did some more testing today and the reg has settled in. I retested it and it is under 1800 psi. If you let it set for 20 seconds it creeps up to 1805 psi. Starts climbing around 1775 psi slowly. Can’t figure why it is doing it. That is why my first shot is 975 fps and the next one 958 fps. It seems to shoot in the 955 fps + or – a couple fps.
I ran a quick program on what the minimum volume would be in the area between the regulator and valve to react as if the regulator was not even there and it came to .78 cc. (or I’m off by a decimal).
Curious if you ever get a chance to determine your new available volume ?
Correct and that is what I have been trying to do. Get the fps as close to the same with reg psi compared to same psi with no reg.
BUT from you have demonstated with your VE-TaC, is that the E-TaC reduces the available volume available per shot, where an un-regulated tank would actually give more volume per shot ? Yes ?
Said another way, if a tank is filled at 2500 psi and a 2500 psi regulator is used then the regulated shot is lower, more like a 2300 fill, because of lack of volume in the TaC and the reaction time of the regulator.
There is only one Etac-Reg. There is a short Etac and a long. With short you can’t take the tank off with out removing the gauge and fill nipple unless you cut off machine off the back of your gun to clear. Long makes it possible to remove your tank.
Is there more volume in the longer etac vs the shorter on?
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Did a shot string to see how many shots I would get with my 1500 psi reg setup and 62 ci tank. Reg has settled in since I first shimmed it to 1500 psi. If it wasn’t for the first shot spike I would have only had a 10 fps difference in 135 shots.
25.4 JSB’s
3000 psi fill 1500 psi reg
62 ci tank
1 919 26 910 51 905 76 904 101 909 126 906
2 910 27 908 52 902 77 906 102 907 127 904
3 908 28 908 53 908 78 906 103 907 128 903
4 907 29 907 54 908 79 908 104 905 129 903
5 908 30 906 55 911 80 911 105 906 130 904
6 908 31 910 56 907 81 907 106 904 131 903
7 908 32 908 57 906 82 906 107 904 132 901
8 904 33 908 58 907 83 904 108 905 133 902
9 905 34 909 59 908 84 907 109 905 134 901
10 905 35 908 60 907 85 905 110 904 135 901
11 907 36 909 61 908 86 905 111 906
12 906 37 911 62 905 87 904 112 907 13 907 38 908 63 907 88 907 113 905
14 910 39 905 64 907 89 907 114 903
15 905 40 910 65 905 90 908 115 906
16 908 41 908 66 907 91 906 116 907
17 907 42 909 67 907 92 907 117 903
18 909 43 911 68 906 93 906 118 905
19 910 44 910 69 907 94 904 119 904
20 906 45 908 70 907 95 902 120 910
21 908 46 908 71 907 96 903 121 907
22 906 47 911 72 906 97 905 122 906
23 908 48 908 73 907 98 907 123 907
24 907 49 910 74 907 99 903 124 907
25 907 50 911 75 908 100 906 125 908
Seems like 907 is a popular number. Shot 136 was 899 fps. I took the Etac-Reg off the tank and put on my adapters to check reg pressure. It was right there at 1480 to 1500 psi depending on how long I let it set. If I let it set for a miniute it would creep up to 1530 psi.
Can’t figure out why my spaces go away and line 13 is not lined up when I post