Valve spring tech
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[[File:Spring clearance diagram1.jpg|thumb|upright=3|Valve spring clearances. Seal to retainer may be less in some cases]] | [[File:Spring clearance diagram1.jpg|thumb|upright=3|Valve spring clearances. Seal to retainer may be less in some cases]] | ||
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==Overview== | ==Overview== | ||
| − | This article will show how to set up the valve spring installed height to prevent coil bind and check/correct the clearance at the valve guide boss/seal and the valve spring retainer | + | This article will show how to set up the valve spring installed height to prevent coil bind and check/correct the clearance at the valve guide boss/seal and the valve spring retainer. |
==Using an installed height micrometer, or "height mic"== | ==Using an installed height micrometer, or "height mic"== | ||
| + | [[File:PRO-66902.jpg|right]] | ||
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This tool fits in place of the valve spring. By extending the body, the measurement is taken from the side of the tool. This leaves your hands free and is accurate as long as the retainer-to-tool matches up correctly. | This tool fits in place of the valve spring. By extending the body, the measurement is taken from the side of the tool. This leaves your hands free and is accurate as long as the retainer-to-tool matches up correctly. | ||
Care must be used to assure the mic is measuring from the same surface of the retainer as the spring bears on. If there's a problem with this, in some cases a shim can be used or a spacer made to compensate for any mismatch between the tool and the retainer. | Care must be used to assure the mic is measuring from the same surface of the retainer as the spring bears on. If there's a problem with this, in some cases a shim can be used or a spacer made to compensate for any mismatch between the tool and the retainer. | ||
| − | The original [http://www.combo-flo.com/msp_hm.htm '''Hite-Mike'''] is available, as well as a cheaper alternative like made by Proform, [http://www.summitracing.com/parts/pro-66902 p/n 66902]. | + | The original [http://www.combo-flo.com/msp_hm.htm '''Hite-Mike'''] is available, as well as a cheaper alternative like made by Proform, [http://www.summitracing.com/parts/pro-66902 p/n 66902].<br style="clear:both"/><br> |
| + | [[File:Snap height.jpg|right]] | ||
==Using a snap gauge== | ==Using a snap gauge== | ||
Put a valve in the head, install the retainer and locks that will be used. Holding the valve tightly against the seat, use the snap gauge to measure the available installed height. | Put a valve in the head, install the retainer and locks that will be used. Holding the valve tightly against the seat, use the snap gauge to measure the available installed height. | ||
Once the available height is known, compare that to the valve spring installed height that is required to get the seat/open pressures needed for the cam to be used. | Once the available height is known, compare that to the valve spring installed height that is required to get the seat/open pressures needed for the cam to be used. | ||
| − | + | <br style="clear:both"/> | |
==Correcting the installed height== | ==Correcting the installed height== | ||
If the installed height is insufficient (and depending on how much more installed height is needed), a +0.050" lock can be used. If even more installed height is needed, there may be different retainers that will give more height, or the valves may need to be replaced with longer valves. In some cases the valve spring seat can be machined deeper. Use caution/consult the manufacturer to be sure the seat can be made deeper without hitting a water jacket or port. | If the installed height is insufficient (and depending on how much more installed height is needed), a +0.050" lock can be used. If even more installed height is needed, there may be different retainers that will give more height, or the valves may need to be replaced with longer valves. In some cases the valve spring seat can be machined deeper. Use caution/consult the manufacturer to be sure the seat can be made deeper without hitting a water jacket or port. | ||
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