Life of a Formula One Power Unit: Valvetrain Systems

The world of Formula One (F1) is changing with impending 2026 F1 regulations imposing even stricter limits on engine component usage while increasing races. The valvetrain system, specifically the intake valves, is a critical determinant in controlling gas exchange within the cylinders, directly impacting air-fuel charge and power output. The aim of this investigation is to study the mechanisms of intake valve and valve seat wear which will influence engine performance due to leakage path development. The wear mechanism of the intake valves considers wear from impact from valve seat interaction, sliding and foreign particle abrasion for quantifying valve seat recession. An FIA 2026-2030 regulations compliant valve train model was developed in GT-Suite to help estimate valve seat wear. The validated model could predict valve recession for a given engine operating speed trace from racetrack data. This report presents a systematic methodology for developing valve seat wear quantification, the effects of charge leakage past the valve on engine performance and hence, performance degradation per race through the decrease of air-fuel charge. It was found that the average wear of the valve and valve seat is within an envelope of 39.6 μm to 48.1μm resulting in power losses of up to 1.6 kW per eight race stint. The proposed schemes can thus be used by power unit manufacturers to evaluate valve seat materials as well as valvetrain kinematics for improving reliability and life of valve train systems for a given race.