This tool determines the distance between the centerline of the wrist pin and the flat surface of the piston top. It is a crucial measurement for engine builders, ensuring proper clearances and optimal performance. For example, if the measurement is incorrect, it could lead to piston-to-valve contact or insufficient compression.
Accurate determination of this critical dimension is essential for achieving desired compression ratios and preventing catastrophic engine failure. Historically, this measurement required manual calculations and careful measurements with specialized tools. Modern online tools streamline this process, offering speed and precision for both professional engine builders and amateur enthusiasts.