Obviously, these valve-control-related issues, associated with insufficient valvespring pressure, are the reason why camshaft manufacturers offer valvespring upgrades. The obvious answer might seem to ...

This illustration shows the spring's relationship to the valve. The valve stem goes through the middle of the spring and is positively connected to it by the retainer and two valve locks (also known ...

Today, high-performance clutch design is so sophisticated, and manufacturers' claims often so conflicting, that it's difficult to know just what type of clutch is best for your particular application.

Those wound-up pieces of high-tensile steel under your rocker arms work so hard closing your valves over millions of cycles that they could probably use a replacement right about now. We're talking ...

The automatic expansion valve (AXV) is similar in construction and appearance to the commonly used thermostatic expansion valve (TXV). However, the metering devices operate much differently. The AXV ...