Sound is an important part of the internalcombustionengine experience, and many engine configurations have their own distinctive sound.

There are many reasons why, but one of the most important factors in an engine's sound is how evenly the exhaust pulses reach the tailpipes. Evenly spaced exhaust pulses tend to result in higherpitched, smoother sound. Unevenly spaced pulses in deeper, more complex, and angrier noise.

In this episode, nerdy automotive journalist Jason Cammisa gives an oversimplified overview of the science behind this, explaining how the regularity can be determined by the crankshaft or the exhaust — and giving examples of each.

He covers 4cylinders (the Honda S2000's equallength headers compared to the Subaru WRX STI's burble), V6 engines (the Nissan VQ versus Ford EcoBoost), V8 (the Ferrari flatplane crank V8 versus an American crossplane V8), V10 engines (the Lamborghini Gallardo evenfire V10 versus the LP560's oddfire, which sounds like two 5cylinders), and the MercedesBenz V12 with equallength headers versus the factory exhaust.

Follow Jason for more insights on Instagram at @jasoncammisa




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