Mecachrome V634 LMDh engine

The Mecachrome V634 LMDh engine is the 3.4-litre single-turbocharged V6 that powers the Alpine A424, the LMDh sports prototype Alpine entered in the Hypercar class of the FIA World Endurance Championship from 2024. It is a heavily modified development of the V634 engine that Mecachrome builds for Formula 2, reworked for endurance racing with the help of Alpine's engineers at Viry, and Alpine has said it is unrelated to the engine briefly used in the Ginetta G60-LT-P1 in 2018. It is paired with the standard LMDh hybrid system, which combines a Bosch electric motor, a Williams Advanced Engineering battery and an Xtrac gearbox. Its reported output is 675 horsepower with a 9,000 rpm redline. Alpine's chief engineer said studies and tests with Mecachrome began in June 2022, and both A424s retired from the 2024 24 Hours of Le Mans with engine problems before upgrades followed.