I assembled related excerpts for you from my fourth book, Airgun Chronicles- Thirty Years of Airgun Testing and Competition (copyright 2013), that presents testing of 349 airguns of all kinds. Some say maximum is 350 PSI and some as much as 365, but when you hit 350, youve pretty much maxed it out. It is also a mistake to pump up the gas-ram pressure too high in search of velocities higher than any particular Theoben model's performance parameters that prematurely fries the piston seal. The gun is for hunting - period Start at 330-335 PSI Ive shot as low as 325 PSI and the cocking effort at the lower pressure drops of dramatically - along with power so its not linear. as the Beeman Crow Magnum, takes as much as 60 lbs. A Theoben Eliminator, better known in the U.S. of effort to cock, while a rifle of equal power and a coiled steel spring might take only 25 lbs. They are very intolerant of dry-firing as I discovered when also discovering the SLR 98 magazine doesn't mix well with Margaritas (resulting in said dry-fires). A Theoben Fenman that develops 12 foot-pounds takes 38 to 40 lbs. Then when at their best, I'd describe the trigger-actions as only a good sporting trigger not nearly 'match-grade'. Otherwise the actual accuracy and performance of Theoben gas-ram guns is TOP-NOTCH.ĭue to their light piston weight (lacking a steel spring behind it), Theoben gas-ram guns produce higher muzzle energies with light to mid-weight pellets than with mid to heavy ammo. I'd describe the trigger-actions not as impressive as Weihrauch or Air Arms springers, sometimes needing judicious adjustments, and also sometimes difficult to successfully accomplish those adjustments. Velocity tested at around 800 fps with lead pellets.22 caliber. The stock and blued metal finish are both in beautiful condition.
#THEOBEN GAS RAM PRESSURE MANUAL#
Original owner’s manual and other literature included. Is there a good substitute pump since the slim jims are rare 10. Use Brocock pump and adapter to pump up ram to about 40 pumps. To achieve FAC velocity the stroke is increased to 3. Good job Sonny and Jim I'm inclined to think that this will make the Eliminator more desirable to seek out. 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. Obviously something is wrong, but the seller of the gun chrono'd it just before he posted it and it was doing a consistent 11.5 ish (he sent the chrono printout). Please make sure your gas ram has a threaded.
#THEOBEN GAS RAM PRESSURE CODE#
All others more to my liking carbines.Īll but the SLR 98 are lighter than comparably-sized (and power) springers. Cocking effort is noticeably higher than comparable springers, but firing behavior noticeably quicker and less 'buzzy' or 'twangy'. 22 caliber with checkered Monte Carlo stock, and comes with a Swift 4-12×40 AO scope. The mighty mystery of the big Theoben has had its DNA code cracked. Theoben gas ram pressure After trying several different pellets and weights, it looks like my evo is doing about 6ftlb. This listing is for a new hose to rifle adaptor to enable you to re-set the correct pressure in your gas ram rifle. The Sciroccos were longer than I like, and the RX longer still. I've read posts on here from blokes who've run Theoben break barrels for years with no power loss.I've owned 2 Sciroccos, a Fenman with. Or maybe it would be better to send them to Ben Taylor, since he's the expert. However, if that's what they need, I'll have to do it. Should I buy a pump and bring them up to power, or would that be a waste of cash? In other words, do they need pumping or fixing? A pump and hose costs about 68 quid, but paying for Theoben to sort them, and the associated postage costs would probably work out at more than that. Pump with hose and pressure gauge for filling the theoben gas ram in the HW90 to desired. They are quality items and a joy to shoot when up to speed, but, if this is going to be a recurring problem, I'll get rid and buy a HW98. That uses the gas ram system and max pressure is listed at 26 bar. The stroke of the piston on a 12 ft lbs Theoben gas ram is 2.
It's about 18 months old and has also seen very little use. Its about four years old, and has never been serviced, but, quite honestly I've hardly ever used it.
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