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Theoben gas ram pressure full#
Theoben gas ram pressure free#

Theoben gas ram pressure free#

Once the rifle is fired, this contained air expands - powering the piston, which in turn, compresses the free air in front of it, thus propelling the pellet in the normal way.This literally all happens in milliseconds, and the result is a super-fast lock time - the time taken from pulling the trigger, to the pellet exiting the barrel - in theory aiding accuracy. Basically, as the barrel is broken and the rifle is cocked in the conventional manner, the air (permanently contained) behind the piston, is compressed.

Theoben gas ram pressure full#

Inspiration for the gas-ram design apparently came from the pneumatically dampened forks on a motorbike, which led to this Cambridgeshire based company patenting their ground breaking work back in 1982.īy replacing the steel mainspring in the compression cylinder, with a sealed chamber full of air (originally gas), the characteristics of the rifle could be altered, and a more maintenance free rifle developed. If you‘ve never encountered these rifles, then let me bring you up to speed, for it was Theoben that originated the design, having now been copied or adopted by various other manufacturers with varying degrees of success. What we have here is the latest spec of their own break-barrel design, that sees that much vaunted replacement power plant pushed to it’s limit. But whilst manufacturers jostle for position, and a slice of the cake where sales are concerned, many offerings are fairly crude, aimed purely at the entry level shooter.Representing something of a top end product where break-barrels are concerned, Theoben’s position in the market place has never been in question and with their highly innovative gas-ram concept, they offer a serious alternative to those who favour this style of rifle. Please note that the Gauge Kit is an additional accessory for reference checking and is not included in the Standard Pump KitWith break barrels undoubtedly still the most popular type of air-rifle available, an abundance of models exist to cater for the demand. Use in conjunction with a good quality chronograph to ensure the power level stays within the legal limit for your country. Features BEST Fittings’ Gas Ram Adaptor with quick detach kit for ease of operation. “Slim Jim” Gas Ram Pump kit for adjusting your Theoben / Weihrauch Gas Ram pressure. It takes a bit of practice to do without a “POP” and a cloud of oily air being evident.

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

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