This tool determines the distance between the top of the piston at Top Dead Center (TDC) and the centerline of the wrist pin. For instance, it aids in calculating this crucial measurement for an engine with a specific bore, stroke, and connecting rod length. This measurement is essential for proper engine assembly and performance.
Accurate determination of this dimension is critical for achieving the desired compression ratio and preventing piston-to-valve interference. Historically, this calculation was performed manually using complex formulas. Dedicated tools simplify this process, allowing engine builders and enthusiasts to quickly and accurately determine the necessary dimensions, saving time and reducing the risk of errors. This precision contributes to improved engine efficiency, reliability, and overall performance.