blodnop valve

Home Forums General Mods/Machinists blodnop valve

Viewing 15 posts - 1 through 15 (of 17 total)
  • Author
    Posts
  • #1359
    tedq
    Participant

    Can anybody tell me how much ftp this blodnop valve gives in the 3 different adjustable stages on a .25 Condor and how many shots?
    Thanks,
    Ted

    #32248
    riffraff
    Participant

    I’m not sure its that easy.

    A Blodnob valve is custom made, and not normally available unless you ask for it to be made.

    I do not know if his valves operate consistently from part to part or not. But from what I heard, they do kick some serious ass.

    #32249
    bodhisdad
    Participant

    Funny you should ask, i just reinstalled mine today in .22 TSS 12″ barrel. I ended up with a 20 shot string which avg. 850.9 and a spread of 37.5 that was full power, but with a factory spring. I was using a heavier spring 25+lb and getting numbers in the low 900’s to high 800’s fps with kodiaks. In .25 i’d think you’d want the heavier spring from Sean, mine is what i could find and its a bit to heavy. I’d also think you’d want the large restrictor, haven’t even used my smaller ones, long story and been busy with grips and such. Its an awesome valve soon as i have my 18″ barrel in that will add another 90fps maybe more to the numbers you see below. I’m going to try for a tighter string which means adjusting the tophat in some more, hit 39+fpe today but the spring was to much. Still a spread of 37.5 isn’t bad at all for 20 shots, seen worse with Talon/Condor stock valves. I just need the right spring and right tophat setting. With the 18″ barrel i’ll be spitting kodiaks at 950 or so which is perfect. I tried the 18″ last summer and got 1006fps with Kodiaks= 47.4fpe and Eun Jins 913fps=53.6fpe ๐Ÿ˜† JSBs with the 12″ barrel avg.around 990fps so they are a bit to light to use.

    Tophat set at 2.5mm and power wheel at 10, 75g hammer. Overall i’m pleased with the consistency, could use a heavier hammer spring. Right now i have a 20 shot 34 fpe rig, used about 800psi i’d guess according to the gauge.
    pellet used was Kodiak 21g. It jumps around a bit to begin with but settleds down nicely and ended up with a nice string. With little diviation from the avg. velocity of 850.9 shot spread of 37.5. My best string yet with this valve.
    1. 838.2
    2. 862.3
    3. 844.5
    4. 854.2
    5. 854.7
    6. 871.5
    7. 854.9
    8. 852
    9. 864.3
    0. 843.1 10 shot avg. 853
    1. 843.1
    2. 863.1
    3. 841.5
    4. 836.5
    5. 848.2
    6. 849.4
    7. 850.4
    8. 856.6
    9. 845.3
    2. 845.3 20 shot avg. 850.9

    Anyone else who is playing with one of Sean’s valves i’d be more then happy to see some strings and compare notes. DNC you going to be able to get that extra hammer spring??

    We lost all of Sean’s valve info due to the greed of another. Seems a good time to reup on things for Sean. Heres a start. I’ve done some playing with this valve when i first got it and had erratic numbers and huge spreads. I’ve got it setup now for consistency vs. raw power. The trade off is obviously velocity and air consumption for a more consistent less powerful setup. I like the later as soon as i drop the 18″ barrel in i’m maxed up with velocity for kodiaks. It will be a sweet running rig.

    Here is a short string with the heavy spring in and tophat set at 2.9mm. Everything else the same.
    1. 915.5 39.2fpe ๐Ÿ˜€
    2. 890.2
    3. 896.9
    4. 889.4
    5. 870.2
    Bent my brech handle so it was time to give up on that 25lb spring ๐Ÿ™„ , ya think. I liked the 900+fps shots from a 12″ barrel though. But a 20 shot avg of 850 is still up there. Plus i had a high of 871.5 so i didn’t loose to much velocity. There is a bit of a learning curve with this valve, lots of practice and good note keeping help. anyone else please put down your experiences with Sean’s valve so all who own one may benefit from our combined experiences.

    #32321
    knifemaker
    Participant

    Quote “I tried kokiaks last summer” Was this with Seans valve.?

    JB’s too light, You gave the fps as lower than the much heavier kodiak. Is this a mis Print?

    The numbers are very close to where I was shoothing with the same pellets, and bbl. length with a hot-rodded talon valve. Makes sence!

    Thanks so much for your time and effort. Looking forward to 18″ bbl. strings.

    Mike (P.S.) I notice that th estring is tighter than the talon moded valve that you posted. Very impressive. Top numbers close, but much tighter!!!

    #32322
    daved
    Participant

    Good idea, Bodhi, I have data from quite a few shot strings, but I need to scan the spread sheets so I can post them. Unless there’s a way to directly post Excel spread sheets? What’s really cool, I’ve got before and after spread sheets with the same barrel but different valves. I’ll try to get them scanned and uploaded to Photobucket ASAP. Later.

    Dave

    #32324
    knifemaker
    Participant

    Daved, I can’t wait to see those!!! Mike

    #32354
    bodhisdad
    Participant

    Mike, Yes everything written is about Sean’s valve. Sorry about the clarity i was jumping from paragraph to paragraph adding in different info as it came back to memory. The JSBs will shoot at 950-1100 fps with the 12″ barrel depending on where the tophat is set at.. I also included numbers i got when i tried out the 18″ with Kodiaks 1006fps and Eunjins 913fps. Thats why i stated JSBs would be to light to shoot, meaning when i have the 18″ barrel in. They are still to light for the 12″ as i look at my notes some more. Unless i want to put in a restrictor. A restrictor is a brass rod threaded on the outside with a hole drilled through the midddle different sizes to accomodate different needs. They are 1/4″ long or so and screw down into the tophat. One can achieve different velocities by adjusting the size restrictor used. Sizes are approximate using my drill bits. largest is a port hole of 5/32″, 1/8″, 5/64″, 1/32″. Sean could make any size within that range. Because i’m using a 12″ barrel i also use the largest restrictor.
    JSB 16g shot string info:
    I got a string with the tophat set at 2.6mm, avg. fps. 997.1, a high of 1083.3fps and a low of 942.3fps. Another tophat setting of 2.8mm avg. fps 1029, a high of 1108fps and a low of 945.4fps those are huge shot spreads as well. On fills of 2800psi they settle down a bit. Even on the string posted above there is some inconsistency in the first 10 shots then it settles a bit more.

    When i last had it in, i was way to focused on the bigger numbers. Here is another string with yet another tophat setting from last summer. I’ve got many strings with different tophat settings and pellets used for the 12″ barrel, a tophat setting of 2.5mm seems to give the most consistent numbers so far. Although i would like to try Sean’s heavier spring and see what happens. Keep the tophat at 2.5, 2.4 and see what happens with consistency. I know if i put in a small restrictor the numbers would tighten up. The spread i got above is amazing considering the valve opening, the largest restrictor size and the velocity. 20 shots and less then 2 fps loss per shot over 20 shots. Avg of 850fps with a 12″ barrel, puts a smile on my face. ๐Ÿ˜€ I feel like Lama, “WEEEE” ๐Ÿ˜›

    Tophat set at 2.8mm, Kodiak 21g pellet used.
    1. 926.7 (40.24fpe)
    2. 914.8
    3. 905.9
    4. 898.5
    5. 901.2
    6. 895.2
    7. 888.9
    8. 876.6
    9. 870.8
    0. 858.6
    Thats a shot spread of 68.1 and a avg. velocity of 893fps., 37.4fpe. So i gave up 40 fps for a much more consistent shooting valve. I’ll get the 18″ in and let the barrel length do the extra work. I’ll try and get the spread a little tighter by turning in the tophat just a bit more .1mm or .2mm Not that i’m complaining, but i suffer from being a perfectionist, sometimes a curse and sometimes a blessing ๐Ÿ™„ The rest of you guys with info start to spill it, maybe we can make this a sticky so Sean’s work is available to those who have a valve and want the most from it. With more info we can then optimize the best setup with this valve, but its so versatile i think it can be used in any configuration up to .25 calibur.

    I’ll do a string with Eun Jins and see what i get, if i have 20 left, i know i’m getting low on them.

    #32384
    mikemv
    Participant

    Sort of surprised the velocity isn’t a bit higher with the 12รขโ‚ฌ

    #32385
    mikemv
    Participant

    Sort of surprised the velocity isn’t a bit higher with the 12รขโ‚ฌ

    #32433
    knifemaker
    Participant

    Thanks BD! Still thinking of the Condor valve. But I am very pleased with the Talon Valve Mod. But that .25 is looking better and better!

    Mike

    #32443
    bodhisdad
    Participant

    Mike i’ve done the Talon valve and avg. 807 for a 20 shot string. I think when i get the correct spring in i’ll see better numbers. A 40 fps TSS with the 12″ barrel is pretty dam good don’t know anyone geting those numbers from a modded valve. If i remember correctly the valve likes a little longer barrel. The shot spread was also more conservative on air. I’ll see what EunJins will yield. Not to mention i’ve got strings with numbrs in the 900+fps range, but larger shot spread, more experimentation is needed. Might go hunting for a new hammer spring yet again.

    #32456
    knifemaker
    Participant

    Thanks Bd! Let me know what you come up with on that lighter spring. And let me know where to get one, and or what to ask for! MIke

    PS> Which reminds me. I set upo targets at 50yd, and 90Yds. And measured the drop with the Kodiaks. I used the Air gun caculator to get the Fps. I’m sure it isn’t exact. I got an average of 7.75 to 8″ drop. The caculator ask for BC of the Kod’s. Their chart listed them at .036. This info gave me At an8″ drop at 90 yds. 915fps. This was at a 2500 psi. Fill (I’m Low again. Man I wish I had a carbon Tank!!!) I’m sure it would be better with 2900 psi.!

    The droop I listed the other day was totaly wrong. Forgot that I was using the point under the cross hairs to range!!

    So far, I am very pleased with the modded valve. But it is wasting a lot of air. Need to pick up a Crony to set the top hat. And wait on your info on a spring. MIke

    #32470
    buster
    Participant
    quote knifemaker:

    Thanks Bd! Let me know what you come up with on that lighter spring. And let me know where to get one, and or what to ask for! MIke

    PS> Which reminds me. I set upo targets at 50yd, and 90Yds. And measured the drop with the Kodiaks. I used the Air gun caculator to get the Fps. I’m sure it isn’t exact. I got an average of 7.75 to 8″ drop. The caculator ask for BC of the Kod’s. Their chart listed them at .036. This info gave me At an8″ drop at 90 yds. 915fps. This was at a 2500 psi. Fill (I’m Low again. Man I wish I had a carbon Tank!!!) I’m sure it would be better with 2900 psi.!

    The droop I listed the other day was totaly wrong. Forgot that I was using the point under the cross hairs to range!!

    So far, I am very pleased with the modded valve. But it is wasting a lot of air. Need to pick up a Crony to set the top hat. And wait on your info on a spring. MIke

    you should try softchrono its very good it worked for me.

    #32486
    mikemv
    Participant

    Clint,
    Doin over 40 with my moded talon valve using heavy pellets. With lighter pellets well into the 900s.
    As outlined using standard parts.
    One can usually say yer wastin air in a 12″ haha Sort of the way it is but brings up a good question regarding what is the optimum barrel length for efficiency. For me the 24″ get too heavy though.

    #32514
    knifemaker
    Participant

    Fhanks Buster, but it would be too much trouble to break down the desk top and haul everything out side! May be if I had a lap top. I think a real chrony is in the cards, and a lot cheaper than buying a new computer!! Haa!!

    Mike

Viewing 15 posts - 1 through 15 (of 17 total)
  • You must be logged in to reply to this topic.