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All Springer/NP/PCP Air Gun Discussion General > American/U.S. Air Gun Gates

What's the most powerful Multi-pump stock and modified?

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Psipumper:

--- Quote from: Hack21 on January 30, 2023, 07:21:02 PM ---
--- Quote from: Psipumper on January 30, 2023, 06:57:53 PM ---I have one at 25 fpe with 14 pumps.

--- End quote ---

That seems very efficient at nearly 1.8 fpe/pump at pump #14!  My 392 is 1.9 fpe/pump at pump #9 with 14.3gr pellets.  I do most of my shooting at 3 - 5 pumps with light pellets and that yields 2.8 - 2.5 fpe/pump respectively.  My 392 is modified with mac1 adjustable piston, some porting work, and the valve is packed. 

Charles is one of the pumper masters around here for sure.

--- End quote ---
The 392 has a swept volume of 58cc per pump. The 362 is 32cc per stroke. You would need to add that to the math to compare. 8 392 pumps is equal to 14 362 pumps in swept volume of air pumped.
I have another 392 with 27 fpe @8 pumps. So 3.375 fpe/ pump for it so it is better than the 362 @ 14 by a small amount.
The 362 spreads the pumping work load over more pumps. Seems easier.

Hack21:

--- Quote from: Psipumper on January 30, 2023, 08:27:37 PM ---
--- Quote from: Hack21 on January 30, 2023, 07:21:02 PM ---
--- Quote from: Psipumper on January 30, 2023, 06:57:53 PM ---I have one at 25 fpe with 14 pumps.

--- End quote ---

That seems very efficient at nearly 1.8 fpe/pump at pump #14!  My 392 is 1.9 fpe/pump at pump #9 with 14.3gr pellets.  I do most of my shooting at 3 - 5 pumps with light pellets and that yields 2.8 - 2.5 fpe/pump respectively.  My 392 is modified with mac1 adjustable piston, some porting work, and the valve is packed. 

Charles is one of the pumper masters around here for sure.

--- End quote ---
The 392 has a swept volume of 58cc per pump. The 362 is 32cc per stroke. You would need to add that to the math to compare. 8 392 pumps is equal to 14 362 pumps in swept volume of air pumped.
I have another 392 with 27 fpe @8 pumps. So 3.375 fpe/ pump for it so it is better than the 362 @ 14 by a small amount.
The 362 spreads the pumping work load over more pumps. Seems easier.

--- End quote ---

That is impressive.  I assume that would be a flat piston and valve and a very heavy pellet or slug to yield numbers like that (with lots of other porting and valve mods). 

I wonder how the dragonfly parameters compare.

Blowpipe Sam:
I'd have to put the Quigley in there somewhere.  If you can find one. ;)

HPP-Mechanic:

--- Quote from: Back_Roads on January 30, 2023, 08:22:25 PM ---Current production the Dragonfly can be woke up with a bit of porting and a shortened hammer spring. I plan on testing this theory soon myself.

--- End quote ---

Same here. I plan on opening the valve & transfer port up a bit to see what happens. I Might even put a pressure gauge on it.  Finding it impossible to buy spare parts (valve, hammer spring, linkage). Still waiting on Wes to make some .25 versions, or maybe a .22 drop-in kit for more fps?

Nvreloader:
Psi pumper > Charles

I know nothing about pumpers other than the usual info, pump then shoot etc ...LOL

If I can ask some questions, How do you figure out the swept volume of a pumper?

I am sliding off the fence to get the new Dragon Fly 2 pumper, 22 caliber,
and want to convert it to 20 cal to go with my Dans.

I also want a 4 rifle set (all the same type) in these calibers 17-20-22-25

Would this new DF 2 be the same as a Dan in 20 cal?

I know with some of the older Dans, with the threaded adjustable rods,
you can increase the volume/power slightly, by very closely setting up the pump arm etc.
I found a site that explains how to do that, but I didn't save the info etc.   :-[

Your thoughts or suggestions,
Thank you,
Don


--- Quote from: Psipumper on January 30, 2023, 08:27:37 PM ---
--- End quote ---
The 392 has a swept volume of 58cc per pump. The 362 is 32cc per stroke. You would need to add that to the math to compare. 8 392 pumps is equal to 14 362 pumps in swept volume of air pumped.
I have another 392 with 27 fpe @8 pumps. So 3.375 fpe/ pump for it so it is better than the 362 @ 14 by a small amount.
The 362 spreads the pumping work load over more pumps. Seems easier.  [/quote]

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