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The paper compares V10 F1 engine solutions developed in compliance with the 2001 FIA Technical Regulations. Similarity rules and non dimensional parameters from previous projects are used to define geometric and operating parameters for partly similar engine solutions basically differing in the bore/stroke ratio. Five different bore values are considered, B=94, 96, 98, 100 and 102 mm, thus producing bore/stroke ratios B/S=2.176, 2.319, 2.465, 2.621 and 2.779 respectively. Results are presented as computed classical engine outputs versus engine speed, including brake, indicated and friction values. By increasing the bore size, both power output and engine speed for maximum power operation increase. Conversely, only engine speed increases while torque output reduces for maximum torque operation. By using the sharpest car acceleration criteria, the engine with bore B=98 mm reaches the highest score.

The paper compares 3.0 liter F1 engine solutions developed in compliance with the 1999 FIA Technical Regulations. A previous paper [28] presented a comparison of similar engines having 10 and 12 cylinders. Benefits of the 12 cylinders were clearly shown terms of pure engine performances. W12 engines made up of three banks of four cylinders are further investigated here. Similarity rules are presented first. These rules and non dimensional parameters from previous projects are then used to define geometric and operating parameters for “fully similar” engine solutions differing only in the bore/stroke ratio. Three different bore values are considered, B=89, 90 and 91 mm, thus producing bore/stroke ratios B/S=2.215, 2.290 and 2.367 respectively. These engine solutions are further refined by introducing variation of intake and exhaust pipe diameters and lengths and valve maximum lift and duration, thus producing “partly similar” engine solutions.