The crankshaft continues to rotate, the instant that the pistons stop and reverse is just that; an instant. It doesn't pause for any length of time. And in a flat plane crank, like in a 4 or ferrari style v8 the pistons will all pause at the same time, in the 8, one bank and then the other bank 90 degrees later, given the V angle is 90 degrees. This is all theoretical though and doesn't take bearing clearances or any flexing into account. I think in 4 cylinder engines this pausing of all pistons and reversing is a major reason for the inherent unbalance in an inline 4.
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