drop in unit for PCP for 2240

drop in unit for PCP for 2240

Joined: October 1st, 2010, 7:46 am

December 2nd, 2010, 3:11 pm #1

Im new to the forum, Does anyone make a drop in unit to convert the 2240 to a PCP? Seems like i saw one once , thanks
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Joined: November 19th, 2004, 4:39 am

December 2nd, 2010, 7:03 pm #2

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Joined: March 9th, 2004, 11:21 pm

December 2nd, 2010, 7:38 pm #3

Im new to the forum, Does anyone make a drop in unit to convert the 2240 to a PCP? Seems like i saw one once , thanks
http://powermax-hipac.com/Products.aspx

Someone trying to "help" the inventor/owner (?) made posts about this unit here a while back, the posts were, well, poorly written (that's polite eh?) and many people were not receptive to said posts. This was before it was available. It is now available and seems to get good reviews.
Should you try one please let us all know how it works.

John

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Joined: November 17th, 2006, 3:51 am

December 3rd, 2010, 3:05 am #4

..but was an honest assessment of the system:


2240 (in this case 2300s) simple PCP conversion.

Like my co2 guns, but fall is here and winter is coming. Thought Id chance the $47 to have this unit shipped to me (thats the shipped price):
http://powermax-hipac.com/Products.aspx

Have some safety concerns with standard valve retention, but if you keep it under 2000Psi. Believe going to a larger size, better quality retention screw should keep you safe at 2K.

This is what was received and it is quite pleasant to find exactly what was shown in the web-sites pictures in the box.
[/IMG]
Pretty simple. Screws into the 2240, one end sealing on the issue valve seal, the other end having a fill nipple, the central portion containing all the pressure so the issue tube sees none.
CO2 12gr. powered:
[/IMG]
AIR powered:
[/IMG]

(Did shorten the LDC and reshape the attachment to allow a fill hose to reach the nipple.)

Others have reviewed this unit with visions of high powered .22 2240s on line. This gun started out as a collage of miss-matched parts, Crooked bar breech, 2300 tube, 2300 striker spring,10 LW barrel, paintball butt stock, home made (way-long) LDC. Would get about 490fps/8.3 gr. and about 70 shots per 12gr. (in summer).

Its a little bitty volume of air. Havent measured it, but suspect it is about 40-45 CCs. (EDIT: eyeball estimate was way-wrong. it has thicker walls than youd suspect. From the maker/seller, its about 30ccs). Cant get a whole lot of good consistent shots at higher power with that small an air volume.

Opened the gun up to remove the weak 2300 striker spring. Used the as issued, standard weight striker and standard transfer port, substituting the RED spring. Was NOT coil bound when at full cock, so could increase tension a bit (but that would increase the sweet spot pressure and I didnt want to go over 1800PSI). Valve as issued, still has the (now useless) piercing stem, which may be hitting on the end of the conversion and acting as a valve opening limiter.

.177 10.1gr. JSB
Red Spring issue transfer port
Full weight striker
1800 1000psi fill
660
673
680

711
706
715
700
689

664

3% of 711 is about 21 feet per second. So from 711 690 there are 4 -5 shots, which really-really suxs., Am getting 10.8 foot pounds from a 10 inch barrel, but 4 good shots just plain suxs.

People seeking pure power should stop HERE...am not going farther in that direction, but believe for at least a couple of shots, could have a +12 foot pound 10" pistol if it were tuned for higher pressure fills.

-------------------

Lower power:

Lathed the striker from its face, making it shorter by .2. This lessens weight and gives more room for a longer spring if needed. Mostly I wanted to lessen weight, keeping the striker stroke the same. Was worried that the slot in the tube (where the striker pin runs) would act as a stop, so lengthened the forward end of the slot by 1/8.

,177 JSB 10.1
Red Spring issue transfer port
Lighter striker
1800 1000psi

618643
650

668
681
684
688
678
674
670
669

654
663
630
619
600
605
589

3% of 688 is about 21 feet per second. From 688- 667 there are 8 shots. Down to about 10 foot pounds, but up to 8 shots.

Shot count still suxs.

Went to the extream Made a reduced diameter port (.09 passage) from white Delrin. Switched to the green spring. Kept the reduced weight/length striker.

.177 JSB 10.1
Green spring small transfer port
Light striker
1800 1000psi

511
513
520
522
531
536
540

545
545
544
558
548
552
553
560
559
556
553
556
552
550

540
538
531
519
503


3% of 560 is about 17 feet per second, so from 560 543 there are 14 shots. Energy is down to 6.8 foot pounds Still not great, but not too bad for a back yard pest shooter. Will re-test at a lower starting pressure as the 7 shot warm up is just too much.

With some work on the valve (removing the piercing stem) and a bit more fiddling around, would guess there are 18-20 consistent shots to be had at about the same power.

For winter back yard use, this seems enough. Can switch back to 12gr. co2 during the warm months as simply as unscrewing the conversion unit.


ANOTHER DAY:


What the little gun needed as a place to hold it besides the bare metal of the tube. Had a section of pump fore end from some old paintball marker or another (black Delrin cylinder). Slotted it to be a slip-fit over the conversion tube. In just the right place for holding, without a lot of weight/bulk.

[/IMG]
Down side would be that the average shooter who picks it up will want to pump it because it looks like a pump action..


Rather than look at numbers on a chronograph, looked that results on targets. This little carbine will be used for pest birds at 20-35yards . That still may be farther than most people would trust a 6-7 foot pound rifle to take care of pest birds, but that energy level worked just fine on co2 so it will work fine on air. Slight change in vel. wont result in a giant POI change until well past this range.

From these 5-shot 20yard targets, shot from 125BAR to 70BAR, it seems 20 bird-killing shots per fill up. Do notice how when it falls off the shot curve, it doesnt play around and really falls off (with such a small volume, that has to be expected).

[/IMG]


Now the neat thing about those 20 shots is that it takes 12-13 strokes of a hand pump (either an old FX or Hills pump) to bring the pressure back up from 70 to 125BAR,. 13 strokes, 20 shots, not a bad little low powered HPA for hand pump/back yard use.

THIRD DAY:

Today was the 20th recharge of this little carbine, for about 400 shots fired.

(1) It does not leak. Will hold exact pressure for 25 hours. (however, such a small volume tends to get warm when filled, even from a hand pump, and read high when first filled.)

(2) Small tube takes 12 pump strokes to fill from 65Bar to 125BAR.

(3) If youre going to push for high energy, make it a .22.


10.1gr. JSB:
125BAR- 65BAR
(1850-950PSI)

516
519
523

531
532
536
528
535
545
546
538
540
538
538
537
542
535
528

523
516

3% of 540fps is about 16 feet per second, and within that 16fps limit, there are 15 shots. Inside of 25 FP there are 19 shots at about 6.4 foot pound per shot.

All 20 shots of that shot-count string at 20yards:
[/IMG]


Thats not bad, if this were a Discovery with a 135cc tube and set with the same settings as this valve, that would work out to 58 (16 feet per second) variation shots.

Abandoned (for now) the AR type stock and went with a modified Crosman plastic
So after 20 fills, if something goes wrong, its not the fault of the HiPAC conversion unit, was just some part/seals time to leak (as all co2, PCP, or HPA guns will eventually do).








Last edited by gubb33ps on December 3rd, 2010, 3:36 am, edited 1 time in total.
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Joined: August 3rd, 2007, 8:13 pm

December 3rd, 2010, 5:25 pm #5

Excellent report Robert.
The shots on the target are a great idea.
There's only so much a string can tell you.
And the main use of a air rifle/pistol is to hit a target!
I've also got a HiPAC and will be looking for the max number of sub 6fpe shots.
Just need to source a Fosters female coupling.
I'd like to see the reduced diameter transfer port seal you made.
What would the effect be using a 2300s valve with the reduced volume spacer.

Cheers
Ian
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Joined: March 9th, 2004, 11:21 pm

December 5th, 2010, 4:53 pm #6

..but was an honest assessment of the system:


2240 (in this case 2300s) simple PCP conversion.

Like my co2 guns, but fall is here and winter is coming. Thought Id chance the $47 to have this unit shipped to me (thats the shipped price):
http://powermax-hipac.com/Products.aspx

Have some safety concerns with standard valve retention, but if you keep it under 2000Psi. Believe going to a larger size, better quality retention screw should keep you safe at 2K.

This is what was received and it is quite pleasant to find exactly what was shown in the web-sites pictures in the box.
[/IMG]
Pretty simple. Screws into the 2240, one end sealing on the issue valve seal, the other end having a fill nipple, the central portion containing all the pressure so the issue tube sees none.
CO2 12gr. powered:
[/IMG]
AIR powered:
[/IMG]

(Did shorten the LDC and reshape the attachment to allow a fill hose to reach the nipple.)

Others have reviewed this unit with visions of high powered .22 2240s on line. This gun started out as a collage of miss-matched parts, Crooked bar breech, 2300 tube, 2300 striker spring,10 LW barrel, paintball butt stock, home made (way-long) LDC. Would get about 490fps/8.3 gr. and about 70 shots per 12gr. (in summer).

Its a little bitty volume of air. Havent measured it, but suspect it is about 40-45 CCs. (EDIT: eyeball estimate was way-wrong. it has thicker walls than youd suspect. From the maker/seller, its about 30ccs). Cant get a whole lot of good consistent shots at higher power with that small an air volume.

Opened the gun up to remove the weak 2300 striker spring. Used the as issued, standard weight striker and standard transfer port, substituting the RED spring. Was NOT coil bound when at full cock, so could increase tension a bit (but that would increase the sweet spot pressure and I didnt want to go over 1800PSI). Valve as issued, still has the (now useless) piercing stem, which may be hitting on the end of the conversion and acting as a valve opening limiter.

.177 10.1gr. JSB
Red Spring issue transfer port
Full weight striker
1800 1000psi fill
660
673
680

711
706
715
700
689

664

3% of 711 is about 21 feet per second. So from 711 690 there are 4 -5 shots, which really-really suxs., Am getting 10.8 foot pounds from a 10 inch barrel, but 4 good shots just plain suxs.

People seeking pure power should stop HERE...am not going farther in that direction, but believe for at least a couple of shots, could have a +12 foot pound 10" pistol if it were tuned for higher pressure fills.

-------------------

Lower power:

Lathed the striker from its face, making it shorter by .2. This lessens weight and gives more room for a longer spring if needed. Mostly I wanted to lessen weight, keeping the striker stroke the same. Was worried that the slot in the tube (where the striker pin runs) would act as a stop, so lengthened the forward end of the slot by 1/8.

,177 JSB 10.1
Red Spring issue transfer port
Lighter striker
1800 1000psi

618643
650

668
681
684
688
678
674
670
669

654
663
630
619
600
605
589

3% of 688 is about 21 feet per second. From 688- 667 there are 8 shots. Down to about 10 foot pounds, but up to 8 shots.

Shot count still suxs.

Went to the extream Made a reduced diameter port (.09 passage) from white Delrin. Switched to the green spring. Kept the reduced weight/length striker.

.177 JSB 10.1
Green spring small transfer port
Light striker
1800 1000psi

511
513
520
522
531
536
540

545
545
544
558
548
552
553
560
559
556
553
556
552
550

540
538
531
519
503


3% of 560 is about 17 feet per second, so from 560 543 there are 14 shots. Energy is down to 6.8 foot pounds Still not great, but not too bad for a back yard pest shooter. Will re-test at a lower starting pressure as the 7 shot warm up is just too much.

With some work on the valve (removing the piercing stem) and a bit more fiddling around, would guess there are 18-20 consistent shots to be had at about the same power.

For winter back yard use, this seems enough. Can switch back to 12gr. co2 during the warm months as simply as unscrewing the conversion unit.


ANOTHER DAY:


What the little gun needed as a place to hold it besides the bare metal of the tube. Had a section of pump fore end from some old paintball marker or another (black Delrin cylinder). Slotted it to be a slip-fit over the conversion tube. In just the right place for holding, without a lot of weight/bulk.

[/IMG]
Down side would be that the average shooter who picks it up will want to pump it because it looks like a pump action..


Rather than look at numbers on a chronograph, looked that results on targets. This little carbine will be used for pest birds at 20-35yards . That still may be farther than most people would trust a 6-7 foot pound rifle to take care of pest birds, but that energy level worked just fine on co2 so it will work fine on air. Slight change in vel. wont result in a giant POI change until well past this range.

From these 5-shot 20yard targets, shot from 125BAR to 70BAR, it seems 20 bird-killing shots per fill up. Do notice how when it falls off the shot curve, it doesnt play around and really falls off (with such a small volume, that has to be expected).

[/IMG]


Now the neat thing about those 20 shots is that it takes 12-13 strokes of a hand pump (either an old FX or Hills pump) to bring the pressure back up from 70 to 125BAR,. 13 strokes, 20 shots, not a bad little low powered HPA for hand pump/back yard use.

THIRD DAY:

Today was the 20th recharge of this little carbine, for about 400 shots fired.

(1) It does not leak. Will hold exact pressure for 25 hours. (however, such a small volume tends to get warm when filled, even from a hand pump, and read high when first filled.)

(2) Small tube takes 12 pump strokes to fill from 65Bar to 125BAR.

(3) If youre going to push for high energy, make it a .22.


10.1gr. JSB:
125BAR- 65BAR
(1850-950PSI)

516
519
523

531
532
536
528
535
545
546
538
540
538
538
537
542
535
528

523
516

3% of 540fps is about 16 feet per second, and within that 16fps limit, there are 15 shots. Inside of 25 FP there are 19 shots at about 6.4 foot pound per shot.

All 20 shots of that shot-count string at 20yards:
[/IMG]


Thats not bad, if this were a Discovery with a 135cc tube and set with the same settings as this valve, that would work out to 58 (16 feet per second) variation shots.

Abandoned (for now) the AR type stock and went with a modified Crosman plastic
So after 20 fills, if something goes wrong, its not the fault of the HiPAC conversion unit, was just some part/seals time to leak (as all co2, PCP, or HPA guns will eventually do).







I certainly wasnt refering to anything you ever posted, your reports are the word on HPA as far as I am concerned. And your report of this kit would sell me on one if I had a 2240 & a little cash (seems a good price to me for such a unit). I believe I read on some forum that a kit for the 2250/60 (?) was in the works also?

John

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