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Acceleration is vitally important in every type of racing, and Formula Ford (FF) is no exception. One of the many choices available to the FF racer in the USA is the type of clutch to use. In some parts of the world, a stock Ford clutch and clutch cover is required – however for SCCA Formula Ford in the USA. Flywheels are rarely machined to the absolute minimum weight; some margin is left to allow for resurfacing as the flywheel is worn down by clutch slippage. The flywheel in an internal combustion engine is essentially an energy-storage device. The power from the engine is delivered in many small bursts – as each spark ignites the mixture and forces down a piston. A flywheel weight reduction of 20.1% from 19.4lbs to 15.5lbs would result in a 20.1% reduction in flywheel moment of inertia – assuming that the distribution of the mass remains the same. Therefore – for a given torque, the lighter flywheel will accelerate 20.1% faster. However, this is not the end of the story – the flywheel is only one part of the total moment of inertia of the drivetrain that is resisting the torque from the engine. Flywheel and clutch The Tilton and Quartermaster catalogs helpfully list the moment of inertia of clutches: With the figures for clutch and flywheel combinations above, we can calculate the rotation speed of each possible flywheel/clutch assembly for a fixed torque of 100Nm (74 foot-pounds), assuming no friction or other losses.
Tags : energy storage device, internal combustion engine, flywheel weight, engine flywheel, moment of inertia, acceleration performance, clutch assembly, clutch size, stock ford, clutch slippage, formula ford, foot pounds, rotation speed, flywheels, quartermaster
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