![]() If I go over the 12ft/lb limit I gently tap the valve with a pin punch about “PFFFFFFT” is enough.To achieve FAC velocity the stroke is increased to 3.2 inches the eliminator has a stroke of 3.7 inches. The diameter of the (dummy piston) or gas ram on the “HE” model is 1/3 of that of the earlier one and the pressure goes up from 300 psi non “HE” to 750 psi “HE”. The stroke of the piston on a 12 ft lbs Theoben gas ram is 2.6 inches “HE” or not.It needs more pressure because the later Theoben’s have a short stroke length of just over two inches, with a cylinder bore of just over an inch.What is “HE” and why does it need more pressure? “HE” = high efficiency.The pre-HE models run with half or less of the “HE” pressure.If it takes that much to get 11+ftlb, then the gun needs new breech, piston and ram seals. More than 1000PSI risks damage to the ram. 800-850 is most common, but I’d suggest to start at 700PSI and work upwards. The “HE” models (HE will be stamped on top of the breech) run at 700-1000PSI, depending on barrel length, calibre and the condition of the gun.Some useful information from: AirgunBBS Forum Thread 245395 Want to purchase the cutting edge FX Airguns Pocket Chronograph from our store? BUY HERE 1-BA, and Standard Schrader Valve threads.ĭO NOT USE A DIVE CYLINDER. ![]() ![]()
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