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GalFisk t1_iy31wog wrote

Every time an exhaust valve opens in a cylinder, the residual pressure of the exhaust gases is suddenly expelled thorugh the exhaust, causing a loud "pop". In most engines, the pops are regularly spaced, creating a regular "tone". In the V arrangement, two pops happen close after one another, and then there's a longer delay before the next two. This causes the characteristic noise.

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