How do you size a valve spring?
Table of Contents
How do you size a valve spring?
Selecting a Spring Use only the valve springs that will give the correct spring pressure with the valve both on the seat and at maximum lift. 2. The outside diameter of the recommended valve spring may require that the spring pocket of the head be machined to a bigger size. 3.
How do I know what valve springs to use?
An important factor when selecting valve springs, is choosing the correct seat pressure, open pressure, and spring rate for the camshaft being used. In theory, you can gain free horsepower just by choosing the proper springs for your engine.
What do upgraded valve springs do?
This allows more of the spring load to control the valve. So a higher seat load with a lighter upper mass of the spring combines to give the valvetrain more control.
How do I know what valve springs I need?
How do you rate valve springs?
Changing the rate of your valve springs can be used to fine tune performance based on your expected rpm range….How does it affect performance?
| Spring #1 | Spring #2 | |
|---|---|---|
| Seat Press. | 110 lbs. | 110 lbs. |
| Spring Rate | 347 lbs./in. | 416 lbs./in. |
| Max Valve Lift | 0.520 in. | 0.520 in. |
| Open Press. (Calculated) | 291 lbs. | 326 lbs. |
How far should the coil be from the bind?
0.050-inch
Determining coil bind clearance is as simple as subtracting maximum lift from the installed height and comparing that number to coil bind. The minimum spec is 0.050-inch between the active (moving) spring coils.
Do you need to shim valve springs?
When shimming valve springs you are trying to keep the characteristics the same but also retain the seat pressure that you lost from cutting the seat or wear from use. A loss of seat pressure could cause valve float, premature wear and loss of compression.
