American made Blodnod info Compilation to date .

I figured all of the info could be put in one place to prevent it being lost in many seperate posts and easy to find….Add info if you have it…Hopefully this will help those that are struggling with getting the valve tuned to it’s peak performance….

RiffRaff wrote;

Ok learned a few things today. First, I like the valve. Second, I like the
valve. Third, I like the valve.

Taking the old valve out of the bottle. I used a 10/32 cap screw about 3″
long, put the head of the screw in the round hole opposite the burst disk.
Held the tank on my thigh and tapped the screw (as a lever) with a
plastic head mallet. 3 strikes and the valve started turning out.

Install of the new valve was straightforward. Thread in, use a strap
wrench to tighten. Filled the bottle to 3000psi.

Left the rifle as is, standard spring, pw 10, standard weight hammer with
Condor striker weight. Combined weight about 68 grams.

Fired 3 kodiaks over the chrony (.25 caliber).

910fps
912fps
911fps

I usually get around 965-975 with the old valve and this hammer/spring
setup.

I cant find my heavy hammer, so I pulled the barrel out and installed the
MEGA spring Brad supplied.

The spring Brad supplies does not fit over the extended part of the power
wheel, so you start with about 5/8″ preload with the PW at 0.

Holy shit, I fuckin near broke my thumb trying to cock this thing. PW=0
and it barely cocked.

Afraid the trap would slam on my thumb, I loaded a kodiak, and shot.
BOOOOM!!!!
1186fps…

Cant adjust down, so I loaded up a 43 gr EunJin. Shot, looked at
chrony…

1032fps. Fired 2 more
1029fps
1028fps Wasnt really paying attention to the target, looked thru scope
and saw a ragged hole at 50yards.

Jesus… I barely broke past 880fps with these before. When they hit the
target you could tell there was some friggin energy being delivered.
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RiffRaff wrote;

Brad Im thinking a lighter spring with the standard hammer is going to
work for me.

When I used a 90gm hammer with the original spring, I didnt gain
velocity I actually lost some.

Using a 75gm hammer with standard spring I was gaining maybe 15fps
over the 2 peice arrangement I have now. I have this hammer in my YN
SS. I havent tried this bottle with that gun yet, it has a 12″ .22 barrel in
it.

Im thinking my original spring is getting worn out, taken a set or
whatever. The new spring in the SS seems a bit stronger when I
compared cocking the 2 guns.
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RiffRaff wrote;

I noticed the tophat does drift out. I still havent got this one sorted
enough to lock it down though.

Before I did any shooting today, I wanted to see exactly how far out the
tophat could go before bypassing the oring. It looked like I was on the
ragged edge, so I turned the tophat in 2 turns. Setting my old valve side
by side with Brads, I had Brads tophat out considerably further, by .101″
I measured from where the bottle contacts the flange on the valves out
to the step on the tophat and compared the 2.

After adjusting the tophat, I filled to 3000psi and started to shoot a
string.

1- 976.1 43gr EJ Pointed PW=0
2- 975.3
3- 969.9
4- 955.3
5- 958.3
6- 953.6
7- 947.9
8- 935.5 Thought I noticed it getting louder at this point.
9- 926.6 Loud POP, and very noticeable blast of air on my face.
10- 915.7 Anothe POP, and blast of air.

The valve apparently opens just fine at 3000psi, there is no hint of a bell-
curve.

Looking at the valve, the tophat oring looked fine but there was a lot of
lube covering the tophat. I pulled the breech and saw the tophat ends
oring was in there, but appeared to be distorted and didnt completely fill
the groove.

The breech oring failed on the tophat end. I measured my old tophat OD
at .310″ Brads valve measures .306″
Im not sure if .004 is enough to make the oring fail or not, they were
90D rings I got from Tony.

I replaced both orings in the breech and reassembled the rifle. Shot once
and there were no leaks however more silicone lube from the orings was
blown onto the tophat.

Im going to try this valve on my SS next and see if the same thing
happens.
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RiffRaff wrote;

Thanks Tag, but I already modified my PW. No need to taper the spring.

I just ground it down until the extended part was about 1/16″ long.
Enough of a shoulder for the standard spring to fit over, and the new
spring jsut sits flush with it.

Im still gonna design a lever cocking mech. Ill see what i come up with
when I get back to work.

—

I shot this valve with the SS today.

12″ .22 barrel, PW=0, standard condor spring and Tony 75gm 1pc
hammer.

JSB 18gr.

1-540
2-541
3-540
4-540
5-538
cranked PW to 4
6-666
7-672
8-673
cranked to 8
9-775
10- 781
11- 783
12- 779
cranked to 12 (max preload)
13- 880
14- 902
15- 904
16- 899
17- 898
18- 901
19- 900
20- 902

With the standard condor valve, pw=4 I was hitting 800fps.

This valve is consistent as any out there, but does need more *smack*
to reach its potential.

So far no more breech ring failures.
===============================================

nalby wrote:

Here’s my string. 3000psi 75g hammer with condor wt 90g total
pw 10 stock talon spring 18″ .22 barrel top hat .205(from top of valve to
shoulder)Kodiaks

955.85 3000 psi
955.17
950.82
968.63
967.16
969.17
985.50
965.38
971.03
965.77 2500 psi
982.54
977.07
957.44
964.84
962.08
976.91
956.15
973.53
970.80
963.38
965.46
960.40
961.39
946.95
949.70
944.52
947.03
942.24 1800psi

so far I’m happy haven’t even really played with the top hat much.
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mamcrackin wrote:

These are #’s with the American Blodnob using an Airhog HPA tank with
2,200psi output regulator and stock AF co2 adapter….I got 120+
shots from 4,500psi to 2,500psi. 90+ shots from 3,800psi to 2,500psi
with the US Blodnob and an average of 915FPS. PW set on 10/10
shooting JSB 15.9gr. I screwed around with the top hat on the Blodnob
to see if I could get more power out of it…I set it on .273″ from the
top of the fat part of the valve to the valve body just like nalby did, and
I also swapped the valve over to the Airhog co2 adapter that has been
bored out for more volume in the chamber….It boosted it to an avg
of 980FPS.
I then tried the PW at 0 to see what it would do and it gave me a
consistant 760FPS…I can only imagine that i would get 200+ shots out of a 4,500psi fill….
I started this string at 3,200psi
Top hat @ 0.260
and PW 10/10
Here are the numbers


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