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The true output of racing engines is normally a closely guarded secret. This is particularly so in Formula One. Also, the consistency of output between engines of identical specifications is of interest to all those involved. This paper outlines a study that was done on the 1993 3.5L Chrysler-Lamborghini CL-01 Formula 1 Engine, and will cover: The output variation of one specific engine configuration/fuel combination over the course of the season, The output variation of a second build/fuel combination over a significant number of builds, The output improvements due to fuels, The output changes due to mechanical developments during the season. The paper will also show that if engine output has been designated as one of the criteria for accepting or rejecting an engine, very small differences in either the acceptable level of performance or the recorded output can make a very significant difference to the number of engines rejected.