A new model I Dragon Fly to test?

[Nvreloader]

SB
Like wet rubber noodles in the shoulders/neck, no problems with the arms.
I am having fun ?? I think....

I am waiting for some more reamers, and a hunk of Oak wood to fit the pump arm,
I am stealing/adding Back Roads pump handle Idea, "Thanks, Back Roads",
which will work very well around here, as I am always resting the forearm on
rocks/sage brush for shooting, will save the OEM forearm from lots of abuse...

Also making a long 6" piece scope base to dovetail/fit on/between the rear sight
and front section of the action, along with a 3" section the rear section,
all Dovetailed and screw attached. Then I'll have approximately 9" to mount my
normal variable scopes, as I can't see Irons any more, old tired eyes.

Note: There is a difference between the DF 1 and 2 rear sight action/spacing,
the DF 2 is shorter distance than the DF1, by 1" approximately, in the rear sight
spacing/distance, as I found out.

And I have a WILD HAIR that growing and needs scratching, this DF 1 or 2 will
become a 20/5mm caliber, or a 177 cal, or 25 cal, as I don't have any in those
calibers that are pumpers.. Yet, Except for the 4 Dan's.
More later,
Tia

[splitbeing]

A DF 20!?!  Now that is a novel idea!

[Psipumper]

I just got mine reassembled. The chronograph says 784 on 8 pumps.

[Nvreloader]

Holy Snack Bar PSI,
What are you running in that beast, Nitro??...lol
That's better than the DF 2 results,

By any chance did you record any spec's/air passage ways holes on that valve?,
it's got to be different valve than the DF 1/2 valves, and or pump head setup..

I know you do have a longer bbl, which helps.
What caliber .177?
Tia,
Don

[Psipumper]

Nvreloader, it is.22 . 14.3 CPHP
I will check it tomorrow and list the numbers for 1 to 10 pumps.
Transfer port is .167” throughout.

I enlarged the throat hole to .196”
The stock hole is too small so this is a bottleneck to support larger transfer ports .
So I did basically the same thing the other guy did that I posted about on page 3 and a little more.
I did install a nice oil wiper on the pump head and got rid of the rubber donut.
The  pump and valve are the same as the dragonfly .

[Psipumper]

I have the numbers for 1 to 10 pumps:
1  277
2  433
3  521
4  588
5  651
6  702
7  746
8  784
9  821
10 825  (21.6 fpe)

Not sure why it only gained 4 fps on the 10 pumps? I think I counted right. Did not have any retained air.
Pretty happy with it like it is for power. I don’t want to stress or damage it from over pumping.

[Nvreloader]

PSI 
Very nice, 

Jerkin the rug out from under me Huh...lol

Well, I'll be following along behind you, 
I have my doubts about this DF 1, we'll see.....
Thanks,
Don

[Nvreloader]

Guys
Results from "G" test,
I am going backwards, and I know this short bbl is NOT helping. 

Summary of test results/ changes made during tests,
Barrel = 21.750" long: 14.3 gr Crosman pellets used in all tests,
Changes made for each test, under the FPS section.
Pumps
"A" test   "B"     "C"    "D"   "E"    "F"     "G"
1. 293--No Air--291--262--269---265--237
2. 396 --282----367---379--374--374--357
3. 446 --341----433---439--443--443--417
4. 475 --433----479---488--492--485--469
5. 511 --449----521---524--531--516--500
6. 531 --492----551---554--557--547--535
7. 541 --598----574---580--587--570--574
8. 561 --557----593---593--600--593--584
9. 567 --561----606---613--620--616--612
10. 561--531---616---629--643--636--619
11..-------587---629---643--656--652--622
12..-------590---643---646--666--669--630
No retained air left after any shot.

"G" Test=
Reamed valve throat to .191" from .170",
reamed valve exhaust exit hole to .160" from .136",
removed valve filter, valve intake hole reamed to .076",
with a long nose to fit intake hole of .076" x .200" long,
fills the intake hole from tapered end of the inside tapered valve,
has a .185" long poppet shaft at the rear of the valve,
used OEM valve spring @ 5.5#'s.
Used 11# Flat wire hammer spring.

I am checking to see if I have any leaking...

Thoughts and or suggestions...
Tia

[Nvreloader]

Hey Guys

By any chance would anyone KNOW the correct thread size for these DF valves?
I have a couple of thread gages and they do not show/indicate the proper thread size.

The threads diameters measure on top of the points = .626" = + / - .001", outside dia,
and measures .690" +/- .001" inside dia, on the points  ...

I do have tap/die for US 5/8 x 24 tpi and 5/8 x 18 tpi, fits Crosman threads?
that fit very close to the DF dimensions...

Your thoughts and suggestions.......
Tia

[Psipumper]

It is going to be a metric thread .
24 tpi is very close to a 1 mm pitch but not close enough to work.
What is the diameter of the male threads on the valve?

[Nvreloader]

PSI
The male outside thread diameter is .626/7", measured across the thread tops.

The inside diameter across the thread tops is .591/2".

I have metric thread gages, but I can't get a match.....
-------------------------------------------------------------------------------------
Note:
The .690" measurement in post #68 is wrong,
I did not catch the error in time and could not correct the mistake, my Bad.

Thanks,
Don

[Psipumper]

 
Nvrloader,
M16x 1 matches those dimensions.
Try rechecking the pitch with the 1.0 gauge again.

[Nvreloader]

Thanks PSI
will do.
 
I want to experiment with a different type of valve seat,
and will have to machine a new top sections.

I think/know, I have some sealing problems going on with this DF 1 rifle. 
Thank you,
Don                         

[Nvreloader]

Well guys,
I am thru messing with this DF 1 -22 cal rifle,
I had another air leak in the "G1" test, so I lapped in all the valve seats,
and did a careful check over everything, put it all back together and got these results

Summary of test results/ changes made during tests,
Barrel = 21.750" long: 14.3 gr Crosman pellets used in all tests,
Changes made for each test, under the FPS section.
Pumps
"A" test   "B"     "C"    "D"   "E"    "F"     "G"  "G2"
1. 293--No Air--291---262--269--265--237--269
2. 396 --282----367---379--374--374--357--374
3. 446 --341----433---439--443--443--417--429
4. 475 --433----479---488--492--485--469--469
5. 511 --449----521---524--531--516--500--505
6. 531 --492----551---554--557--547--535--528
7. 541 --598----574---580--587--570--574--554
8. 561 --557----593---593--600--593--584--567
9. 567 --561----606---613--620--616--612--574
10. 561--531---616---629--643--636--619--593
11...------587---629---643--656--652--622--606
12...------590---643---646--666--669--630--613
No retained air left after any shot.
"G2" test same as G1, just lapped the valve seats,

But, I still have an air leak...... from these results
It won't get any better without a longer bb length either.

Thoughts or suggestions.......
Tia

[Nvreloader]

Well, I got curios about the results of shooting results with a longer bbl,
pulled a bbl off the DF 2 and put it on the DF 1, both are 22 cal,
I am kind'a disappointed with the results,
but there is now a record to refer back to.

Summary of test results/ changes made during tests,
Barrel = 21.750" long: 14.3 gr Crosman pellets used in all tests,
Changes made for each test, under the FPS section.
Pumps
"A" test   "B"     "C"    "D"   "E"    "F"     "G"  "G2"  "G3
1. 293--No Air--291---262--269--265--237--269--219
2. 396 --282----367---379--374--374--357--374--347
3. 446 --341----433---439--443--443--417--429--423
4. 475 --433----479---488--492--485--469--469--472
5. 511 --449----521---524--531--516--500--505--511
6. 531 --492----551---554--557--547--535--528--538
7. 541 --598----574---580--587--570--574--554--557
8. 561 --557----593---593--600--593--584--567--570
9. 567 --561----606---613--620--616--612--574--600
10. 561--531---616---629--643--636--619--593--613
11...------587---629---643--656--652--622--606--612
12...------590---643---646--666--669--630--613--619
No retained air left after any shot.

"G3" test same as G2,
just added a 1" longer bbl from a DF 2 rifle = 22-5/8" length,
DF 1 bbl length is 21-5/8" long. Air holes were the same diameter.

Note: I am not 100% sure that the air passage ways were completely in line,
as the test results are not what, I think they should be.

Your thoughts or suggestions..........
Tia

[splitbeing]

Bummer about the results, but it is now in the record for the rest of us to learn from.  Thank you, Don!

[Nvreloader]

Thanks SB

I should have done it the correct way and removed the action
and made sure the air ways were lined up.
The next time I'll align the air way thru the action etc.

And I still have an air leak, somewhere?
It's either the pump head "O" rings or the valve, I'll find it sooner or later.
Tia,
Don