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Old 04-29-2015, 10:03 PM   #1
Rdsail
Junior Member
 
Join Date: Feb 2013
Location: Richmond, VA
Posts: 28
Default High efficiency Mrod .25 Valve

Specs:
Tport: 0.156 Barrel Port: 0.156 Valve: Throat: 0.210 Valve Exit port: 0.167

Intake: I opened it as mush as possible and still have material to hold the spring. Also drilled two hows to allow outer flow.

Now The pictures:








Here is the mod to the shroud holder:




There has been a significant power gain. I'm topping out at 980 with JSB kings and I could add more hammer if I want to. But I brought my hammer down to about ave of 890. My shot count increased significantly and my efficiency went from to 1.304.

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Diana 48 .177, AA S400 MPR FT .177 - Field Target - WFTF, Custom Bottle Disco .22 - 30 fpe, Mrod .25 Project gun
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