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Stock 24v springs allow the intake valve to completely blow open at 50psi on the bench, but still start to open at 35psi. This is a major problem and it is intensified as RPM increases. With high drive pressures your engine might even be experiencing reversion, when the exhaust valve blows open on the intake stroke contaminating the intake charge. Get control of your valves with a set of Hamilton springs.
Stock springs have 78-82lbs of pressure seat pressure on average at 1.380". If you are over 35psi (boost or drive pressure) and 3,800 rpm, stock springs do not fully control the valvetrain. This allows a few negative things to happen. 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 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. Triple Shot peened and stress relieved.
FOR COMPARISON: Not all 24valve springs are created equal. Hamilton has started seeing other companies market products that are called 110lb 24 valve springs, when in reality they have 117-119lb of seat pressure and almost 250lb nose pressure at .320 lobe lift. Also, they are designed as an entry level spring for a dodge neon, but are re-boxed and sold to the diesel crowd. This spring can cause major lobe wear to anything over a stock lift cam. ALL of Hamilton's cams have more than stock lift.
For comparison, Hamilton's 103lb springs have 102-104lb seat pressure and 180lb nose pressure with the 188-220. By running anything other than their 103lb 24v springs with a Hamilton cam, you nullify the warranty. If you run a cam with more than .320" lobe lift and anything other than the 103lb spring you run the chance of experiencing coil bind before maximum valve lift is achieved.
- ManufacturerHamilton Cams
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Can you use these valve springs with a stock cam??
Yes, these can be ran with a stock OEM camshaft. - AW