Author Topic: Benji pump mod for quicker filling  (Read 5252 times)

Offline DougT

  • Full Member
  • ***
  • Posts: 232
    • http://
Benji pump mod for quicker filling
« on: May 02, 2010, 10:20:14 AM »
This morning I made an adapter to connect my shop air compressor the my Benjamin hand pump.  It screws in where the small, brass air filter goes.  I set my shop compressor regulator to 30 psi.  This works very well.  I pumped my 22ci 3000# HPA tank to 1000 psi in about 60 strokes and 2500# in about 100 more.  Way quicker that sucking atmospheric air.  The only drawback is it heats up quicker.

Hammerli 850 HPA .22 & Leapers 3-9x32  --  TF-89 .22 & Leapers 4x32
---------------------
2010 air rifle kills
288 starlings
235 pigeons
6 crows
25 other birds
56 ground squirrels
3 tree squirrels

---------------------
2009 air rifle kills
181 various birds
57 various squirrels

Offline Thumperrr

  • GTA Donations
  • ******
  • Posts: 37
    • http://
Re: Benji pump mod for quicker filling
« Reply #1 on: May 02, 2010, 11:26:06 AM »
Hmmm we need to find some way to cool the air
We\'re all in this together !If you see a Rabbit with an Orange Vest on...DON\'T SHOOT...it\'s me !

Offline Jaymo

  • Hero Member
  • *****
  • Posts: 2049
    • http://
Re: Benji pump mod for quicker filling
« Reply #2 on: June 09, 2010, 09:52:11 AM »
Install a transmission cooler between the air compressor and the hand pump inlet. You could have the cooler lay flat and put a block of dry ice on top of it.
Or, you could submerge the cooler in a container of ice water.
Even just having a good fan or window unit air conditioner blowing across the cooler would give a much cooler air charge to the pump and prolong the pump cycle prior to pump overheating.

You could also install water traps at the compressor outlet, and at the pump inlet to remove as much moisture as possible.
15th Battalion, Mississippi Sharpshooters, CSA.

Il buono, il cattivo, ed il brutto.

\"Mmm, bacon.\"
\"Squirrel.\"
\"Mmm, squirrel.\"

Offline kiwi

  • Hero Member
  • *****
  • Posts: 1410
    • http://www.nzairgunners.com
RE: Benji pump mod for quicker filling
« Reply #3 on: June 09, 2010, 09:24:14 PM »
why don't yer pump yer compresser recevier "tank"
and let it sit...to cool be for yer use it...airs only
warm while its being compressed...then it kools..

pete
Kiwi

Spring guide sets...  http://www.trademe.co.nz/Members/Listings.aspx?
http://www.nzairgunners.com

If guns are outlawed ONLY outlaws will have guns

A tin of Gamo pellets is like a box of chocs U never know what yer going to get.....



Offline DougT

  • Full Member
  • ***
  • Posts: 232
    • http://
RE: Benji pump mod for quicker filling
« Reply #4 on: June 15, 2010, 07:49:21 PM »
I have a moisture trap on the compressor output and it only takes one compressor run to 110psi to fill the tank then I unplug it and hook it up.  The first session is 40-50 strokes and it gets warm.  If more are needed, I wait about 10 minutes with the pump extended and then give another 20-30 strokes.  

Hammerli 850 HPA .22 & Leapers 3-9x32  --  TF-89 .22 & Leapers 4x32
---------------------
2010 air rifle kills
288 starlings
235 pigeons
6 crows
25 other birds
56 ground squirrels
3 tree squirrels

---------------------
2009 air rifle kills
181 various birds
57 various squirrels