{"product_id":"theoben-weihrauch-hw90-gas-ram-charging-pump-kit-slim-jim","title":"Theoben \/ Weihrauch HW90 Gas Ram Charging Pump Kit – Slim Jim","description":"\u003cp class=\"p1\"\u003eSuitable for “HE” and non “HE” Rams. 1-BA, and Standard Schrader Valve threads.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eDO NOT USE A DIVE CYLINDER. CHRONO AFTER ADJUSTMENT\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eWant to purchase the cutting edge FX Airguns Pocket Chronograph from our store?\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(255, 255, 0);\"\u003e\u003ca rel=\"noopener\" title=\"FX Sweden Pocket Chronograph V2\" href=\"https:\/\/www.scubaequipmentservicingcentre.com\/products\/fx-sweden-pocket-chronograph-v2?_pos=1\u0026amp;_sid=d77d60a27\u0026amp;_ss=r\" style=\"color: rgb(255, 255, 0);\" target=\"_blank\"\u003e\u003cstrong\u003eBUY HERE\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSome useful information from: \u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(255, 255, 0);\"\u003e\u003ca style=\"color: rgb(255, 255, 0);\" rel=\"noopener noreferrer\" href=\"http:\/\/www.airgunbbs.com\/\" target=\"_blank\"\u003eAirgunBBS\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eForum Thread\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(255, 255, 0);\"\u003e\u003ca style=\"color: rgb(255, 255, 0);\" rel=\"noopener noreferrer\" href=\"http:\/\/www.airgunbbs.com\/showthread.php?245395-Theoben-Gas-ram-pressure\" target=\"_blank\"\u003e245395\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe “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. 800-850 is most common, but I’d suggest to start at 700PSI and work upwards. More than 1000PSI risks damage to the ram. If it takes that much to get 11+ftlb, then the gun needs new breech, piston and ram seals.\u003c\/li\u003e\n\u003cli\u003eThe pre-HE models run with half or less of the “HE” pressure.\u003c\/li\u003e\n\u003cli\u003eWhat is “HE” and why does it need more pressure? “HE” = high efficiency.\u003c\/li\u003e\n\u003cli\u003eIt 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.\u003c\/li\u003e\n\u003cli\u003eThe stroke of the piston on a 12 ft lbs Theoben gas ram is 2.6 inches “HE” or not. 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”. To achieve FAC velocity the stroke is increased to 3.2 inches the eliminator has a stroke of 3.7 inches. All Theobens after TB 6000 are “HE”.\u003c\/li\u003e\n\u003cli\u003eIf I go over the 12ft\/lb limit I gently tap the valve with a pin punch about “PFFFFFFT” is enough. It takes a bit of practice to do without a “POP” and a cloud of oily air being evident.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Best Fittings","offers":[{"title":"COMPLETE KIT","offer_id":52405411873115,"sku":"09T1-AC03","price":135.0,"currency_code":"GBP","in_stock":true},{"title":"STANDARD KIT","offer_id":52405411905883,"sku":"09T1-AC01","price":115.0,"currency_code":"GBP","in_stock":true},{"title":"GUAGE KIT","offer_id":52405411938651,"sku":"09T1-AC02","price":30.0,"currency_code":"GBP","in_stock":true},{"title":"GAS RAM ADAPTER","offer_id":52405411971419,"sku":"03T1-AC02","price":20.0,"currency_code":"GBP","in_stock":true},{"title":"NON RETURN VALVE BODY","offer_id":52405412004187,"sku":"09T1-SP01","price":12.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/5028\/0027\/files\/09T1-AC03.jpg?v=1771373488","url":"https:\/\/www.scubaequipmentservicingcentre.com\/products\/theoben-weihrauch-hw90-gas-ram-charging-pump-kit-slim-jim","provider":"Scuba Equipment Servicing Centre","version":"1.0","type":"link"}