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PCP - HPA - C02 Gate => PCP DarkSiders Forum => : DonTMN September 21, 2009, 02:45:27 AM
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I built a PCP in .22 Caliber using a Walther/Lothar choked barrel. I am powering it with a 13 cu. inch tank from JDSairman. It has a regulator on the tank and for the life of me I cannot find my paperwork so I do not know it I bought the 1400psi regulator or the 1600psi regulator.
In any case I am getting speeds in the high 600's like 680fps, 690fps range for the most part. Does is sound about right?
The reason I ask is that I have a Discovery in .177 I got from Mac1 with the power adjuster and it is pumping out speeds in the mid 900fps...
I am testing with the Crossman domed premier pellets 14.3 grains I beleive and the barrel is about 22" in total finished length. I know these are heavier and larger so I know they won't be as fast I am just trying to determine if this is about right speed wise or if I have a valve or striker issue.
Thanks,
DonTMN
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I modded my Disco .22 shooting a high 900 fps at 1800 psi. At 1600, I'm getting around 880 fps. I'm using 14.3 CPHP. I think you can squeeze a bit more velocity.
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Add some thin washers to the regulator. When you open it you will see a bunch of curved washers, the last one will be flat that slips over an o ring. find the same size washer and same thickness and place it next to the original flat washer. This will add approx 100 fps for every washer you add.
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Thanks much for the help.. DonTMN