{"product_id":"hamilton-12-valve-cummins-heavy-duty-conical-springs","title":"Hamilton 12-valve Cummins Heavy Duty Conical Springs","description":"\u003cmeta charset=\"UTF-8\"\u003e\n\u003cdiv class=\"product-short-description\"\u003e\n\u003cp\u003eFits: 89-98 12v Cummins \u0026amp; 4bt Cummins\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cform method=\"post\" enctype=\"multipart\/form-data\" class=\"cart cart_group composite_form single standard small_width\"\u003e\n\u003cdiv id=\"component_1582216543\" class=\"composite_component component single options-style-dropdowns hide-incompatible-products hide-incompatible-variations first active last\" data-nav_title=\"Valve Spring Compressor\" data-item_id=\"1582216543\"\u003e\n\u003cdiv class=\"component_title_wrapper\"\u003e\n\u003ch2 class=\"step_title_wrapper component_title\"\u003e\u003cspan class=\"aria_title\" aria-label=\"Valve Spring Compressor\" tabindex=\"-1\"\u003eValve Springs, locks, retainers\u003c\/span\u003e\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/form\u003e\n\u003cp\u003eSeat Pressure 165 lbs, comes with retainers and locks.\u003c\/p\u003e\n\u003cp\u003eIf you are over 30lbs of boost\/drive pressure or over 3500rpm with your 12valve, you are experiencing a few negative things. First, valve float, which can cause serious damage to the valvetrain. Second, intake and exhaust valves can be blown open by boost and exhaust drive pressure which allows reversion. Reversion can hurt your power potential by allowing exhaust gasses to enter the cylinder on the intake stroke. Inert gasses in the exhaust, when re-introduced into the cylinder shield the fuel particles from oxygen in the cylinder. This does a few things that negatively affect power. It increases the time delay from the start of injection to start of combustion, it decreases the maximum pressure and maximum temperature reached in the cylinder and it increases the total time needed to completely burn the available fuel. Correct valve spring pressure is a very important piece of power production. We have seen 10-12 hp increases with customers changing their 60Lb. spring to our beehives. These springs will work well up to 4,500 rpm with moderate cams and OEM size valves. If you are spinning over 4,500RPM with a healthy cam, and\/or larger valves, then you need to look at going to our dual spring for safety and valve control.\u003c\/p\u003e\n\u003cp\u003e*We have just updated our spring to be a Conical spring\u003c\/p\u003e","brand":"Far From Stock","offers":[{"title":"Default Title","offer_id":50360685068574,"sku":"07-s-001  (premier) (drop)","price":912.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7171\/1262\/files\/image_94f7625e-3514-4fe5-a0ea-8c8caaa98fa1.jpg?v=1780437077","url":"https:\/\/platinumhpsolutions.myshopify.com\/products\/hamilton-12-valve-cummins-heavy-duty-conical-springs","provider":"Platinum High Performance Solutions, LLC.","version":"1.0","type":"link"}