| :synchros match engine speed to gear/wheel speed. The syncros match the speed of input shaft to the countershaft The weight of fw, clutch cover and pressure plate will count as a part of the rotational mass of the engine side. Unless you shift without using the clutch, this isn't true :Synchronization happens after the clutch is engaged when they attempt to mesh two parts with two different speeds. Syncronization between the input shaft and the countershaft occurs before the clutch is engaged. Syncronization between the engine and transmission occur as the clutch is engaged. In essence, the clutch is a syncronizer between the engine and transmission. That's why lightweight flywheel is easier to shift and is recommended for road racing. No, the light weight flywheel makes it easier to revmatch while the clutch is still engaged. This brings the input shaft and counter shaft speeds closer together. When the actual shift occurs, the flywheel doesn't matter because it is not connected to the input shaft with the clutch disengaged
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