Author Topic: CUSTOM PUMP (Read 25725 times))

rsterne · « **Reply #40 on:** January 28, 2013, 11:50:01 AM »

The bungees would have the least force at the bottom where the most force is required....

Bob

Qb78guy · « **Reply #41 on:** January 28, 2013, 07:15:23 PM »

Hmm a good excuse to put on a few LBS.

Bluerose · « **Reply #42 on:** January 31, 2013, 05:48:23 AM »

so the idea of SUPERCHARGING my pump seemed to be to good to be true when I saw the video.

I already have a good shop compressor and a hose with fittings so I set off to harbor freight with my son, I spent about $32 on filters and fittings then I had to make a stop at home depot and spend about $3 on some other small fittings.

I bought 2 types of filters, the one that plugs into the compressor is a oil/water separator then I put a desiccant dryer/filter on my hand pump and a air hose connects the two. I set the reg on the compressor to 50PSI, hooked my gun to the pump and the pump to the compressor and started pumping. It is defiantly harder to pump down BUT you really don't even have to pull the handle up as it raises from the incoming air pressure, I'm 6ft and 170lbs ish and pumping still seems easy to me.

I was filling from 1000psi to 2100psi and normally it would take me about 25 pumps but with the supercharger it took about 13-14, I would rather spend more time shooting then pumping any day! I filled my gun 6-7 times this way and I had no problems.

Ok I tried this also tonight. Went to Harbor Freight and got a regulator for my homemade-portable-12volt-3gal system I made years ago. Had some fittings and a trip to wally world in the middle of the night to get teflon tape... ( i work night shift) So I hook everything up. set the reg to 50 psi. the handle goes up. I push down. The handle comes about half way up, I push down and it some air goes into the tank. The handle does not want to come back up.... feels like a vapor lock situation.... or maybe a vacuum lock.. I think things over. Disconnect the "supercharge system" check if pump still works. it does,but first two stroke felt like an oring dragging. ok... more head scratching. reset reg to zero, hook it all back up.... good thing I installed quick disconnects on it! raise pressure in 5 lbs increments. works fine till 30psi. then locks the pump up. hmmmm..... still not sure why this is. so i pump up my AirForce talon tank at 25psi on the super charger. observation: instead of the stroke becoming hard in the last inch of the stroke it started just above the halfway point and got stronger at the end of the stroke... not any harder than with out the air compressor just a longer "full compression" stroke. vary doable. did not count strokes but noticeably less required to fill tank.

As I don't know what the insides of my airforce pump look like, I can't say what make it seam like it locks up at 50 psi. i used all steel parts to hook up the air. i would really like to do this at 50 psi or higher. Any suggestions guys?

Patrick.

CitySniper · « **Reply #43 on:** February 01, 2013, 03:40:14 PM »

sounds like your pump is shot

Rescue912 · « **Reply #44 on:** February 01, 2013, 03:51:31 PM »

Ok, how about this ... Screw a paintball tank onto a home brewer regulator set for 50PSI and shoehorn the output of that into the pump. Thinking about field or range use. I know liquid CO2 isn't kind to N-Buna o-rings but will CO2 gas cause the same issues? Have to be sure to keep the tank vertical to avoid any kind of hydro-lock.

This is the reg I was thinking of - http://www.kegoutlet.com/pin-valve-regulator.html

Have to find one cheaper to be worth the effort.

Rescue35 · « **Reply #45 on:** February 01, 2013, 04:05:24 PM »

Yall sure are working really hard to find a way to not have to work so hard.

End the end the same amount of "work" goes into reaching your chosen pressure.

If you are trying to save time and assuming you are a slow pumper you might be saving a minute? (4 seconds per cycle x 15 cycles saved).

Fun project though. Combine this with the flywheel pully setup in the other thread and let her rip!

FuzzyGrub · « **Reply #46 on:** February 07, 2013, 07:14:57 PM »

I finally got up to HF and purchased the parts I didn't have. Was planning to add the decicant dryer anyway. Should have it together and run 1st test this weekend. I couldn't find a 45 degree elbow, so going straight like Qb78guy did, for now.

Mod90 · « **Reply #47 on:** February 07, 2013, 07:54:52 PM »

Good luck Fuzzy. If we get a good report back from you, I'm gonna try this with a Hill MK3. Might be an interesting project.

FuzzyGrub · « **Reply #48 on:** February 09, 2013, 12:09:59 PM »

Assembled and did initial test. Pumping up the p'rod from 1900 to 3000psi, seemed to take half as many pumps. The benji pump leaks air around the bottom collar nut when air pressure is applied. I have the "improved" o-ring kit and krytox lube. Probably will perform that before any more pressure assist testing.

SwampDonkey · « **Reply #49 on:** February 10, 2013, 11:13:55 PM »

this really not worthy....no place on my pump to hook into

Steve The Chimney Sweep · « **Reply #50 on:** March 06, 2013, 04:26:46 PM »

Has any one done more work on this. I have my first PCP on the way and am looking for ways to fill it.

Thanks
Steve

FuzzyGrub · « **Reply #51 on:** March 06, 2013, 05:29:23 PM »

Quote from: Uncle Steve on March 06, 2013, 04:26:46 PM

Has any one done more work on this. I have my first PCP on the way and am looking for ways to fill it.

Thanks
Steve

I haven't. I just rebuilt a spare pump, and put on a desicant dryer and same fitting. If I try it, and still leaks past bottom o-ring, will call it a bust.

venxxxxx · « **Reply #52 on:** March 17, 2013, 04:36:27 PM »

Where did you get the dry pack, is it a diy item ?

FuzzyGrub · « **Reply #53 on:** March 17, 2013, 04:39:24 PM »

Quote from: venxxxxx on March 17, 2013, 04:36:27 PM

Where did you get the dry pack, is it a diy item ?

Harbor Freight: http://www.harborfreight.com/inline-desiccant-dryerfilter-68215.html

It was $7 at local store.

venxxxxx · « **Reply #54 on:** March 18, 2013, 03:16:29 PM »

I went to Lowes last night and did the same set up. The dry inline filter was $11.xx at Lowes though, with all the fittings comes to like $15, I still gotta get a water collector for the compressor. But I did try it at 60psi last night and it sure was hard to pump but did fill it up in record time.
Maybe around 20-40psi is enough for pumping without breaking all the weight into it.

Great MOD!

sperho · « **Reply #55 on:** April 01, 2013, 07:26:21 PM »

I just did the supercharge thing on my Benjamin pump. I have partially dried air (filtered at 100 psi with my spray gun setup), which I used to fill a tank similar to FuzzGrub two posts up to 2 bar. I just filled my Marauder from 2000 to 3000 psig with 30 strokes. It took all of my weight (170 lbs) to drive the pump down, but there was no leakage anywhere on the pump. I'll fill the portable to 1 bar and give it a go as well. My goal is to take the gun from ~1900 psi to 3000 psi in 40 strokes. I may blow out an o-ring now and then, but they appear easy enough to replace on the Benjamin pump. The question is: when it goes, should I replace the high pressure seal with a urethane or Viton o-ring (both 90A hardness)?

sperho · « **Reply #56 on:** April 01, 2013, 09:37:32 PM »

1.75 to 2 bar seems to be the sweet spot, for me, as far as fill speed vs. force required.

JPowell490 · « **Reply #57 on:** April 01, 2013, 10:15:36 PM »

Let's all cut the BS in this and be real. This CANNOT be good for the hand pump. If it was that easy, the pumps would have some type of instructional video for this.

Hey, I like the idea and it seems cool, but this just cannot be good.

sperho · « **Reply #58 on:** April 02, 2013, 01:28:15 AM »

Like I said, without BS, it'll probably blow the high pressure seal prematurely. I'm not worried about that though. They are only o-rings, which are cheap. It sure won't damage the metal bits unless I stupidly go crazy pumping after a seal blows... I love being able to take the gun to my desired pressure in about half the strokes. I'll update this thread when the seal goes. I'll keep the 2 bar head pressure on the inlet until then. Of course they wouldn't advertise this, because the in-warranty repairs/replacements would probably go through the roof!

Tom SC · « **Reply #59 on:** April 02, 2013, 09:33:01 AM »

Let me ask how are you getting a good seal at the pump inlet? It's not a tapered thread, I tried this setup and found my pump always had a substantial air leak at the inlet fitting. Thanks

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CUSTOM PUMP

Author Topic: CUSTOM PUMP (Read 25725 times))

Qb78guy

Bluerose