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The design process followed for the design of a Formula-SAE engine is described. Current rules and past competition results were used to constrain the powertrain system. This system consists of the intake system, engine, transaxle, and exhaust system. Intake restrictor design is discussed. Options were compared using a friction analysis. Computer simulations were used to develop brake power and torque graphs. An analysis of thrust vs velocity graphs with those torque curves have been developed. This process serves as a useful tool in understanding the tradeoffs such as the number of cylinders, piston speed, cylinder size, etc; and how they can be used to develop a competitive package.