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Gmac Brass Power Adjuster Spring And Guide/Drilled Out Standard Valve For more air space
Hammer Mods//Gmac 30% Lighter valve Spring/Gmac Brass Safety Catch//Transfer port drilled out
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Final setting

June 27 2012 at 7:58 PM
robert  (Login gubb33ps)
Crosman Forum Member
from IP address 68.105.50.68


Response to Transfer port restrictions

OK...with a goal of 12 foot pounds and a tiny air volume of an estimated 44ccs, kept playing with the transfer port. Striker hit was running the carbine at 160-110BAR (or about 2350 to 1600psi.

Changed the tension UP a little bit (one pre
tension turn of the screw), swapped for a striker that was 10gr. Lighter, and changed the transfer port to .072 ( 5/64ths).
[IMGhttp://i157.photobucket.com/albums/t50/ribbonstone/Hip Ac/DSCF1899.jpg[/IMG]

14.3gr. Benjamin Cylindrical

581
597
601

606
613
620
623
628
628
625
624
618
614
606
608
607
610

596
597
579

Which works out to:
25 feet per second = 628 603= 14 shots

So... 2350-1600 fps...44cc....20 shots...601fps average...call it a BAR/CC-FPE of about 10.

Just saying.

Is not a great long shot count, but it has a dinky air volume.
Efficiency of 10 is pretty good for a 12 foot pound gun (OK..call it 11.5 to 12.5 gun).

Suggestions:

1. Restrictive transferor port is USELESS if looking for maximum velocity.
2. The increase in shot count with a strangled down transfer port is VERY CLOSE to the same energy x shot count of a wide open transfer port...it just doles out the energy over a long time frame.



 
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