Various engine configurations sound different, primarily because of their layouts.
Exhaust notes help give cars personalities, a trait that's due to the different type of engines they have. Toyota has released a helpful explainer on why that is.is what generates sound and, in a typical four-stroke engine, that happens once every two crankshaft revolutions.
The more cylinders an engine has, the more frequently a cylinder is on its combustion stroke. That means the sound is being generated more consistently, making it smoother and fuller to the ear.because their cylinders move in pairs, cancelling out vertical and horizontal vibrations. The lack of vibration makes for a more pleasant driving experience, but these engines also have an advantage when it comes to sound.
V-8 engines can produce great sound as well, but the exact tune depends on their configuration. The stereotypical rumble of muscle cars and NASCAR stock cars is produced by a cross-plane crankshaft. In this more common configuration, uneven firing impulses cause exhaust gases to move in a choppy manner, creating that distinct sound. Flat-plane crank V-8s—like the ones used in the C8and Z06—move their exhaust gases more smoothly, resulting in a higher-pitched sound.
These are just the sounds of naturally aspirated engines. Turbochargers add a bit of hissing and whistling to the soundtrack, which is associated with air moving in and out of their turbines depending on throttle input.Road cars are also generally required to have mufflers, which use a series of chambers to slow down the exhaust gases and absorb some of the sound.
A good exhaust note is partly why Toyota is looking for ways to continue making combustion engines in the face of stricter emissions rules that are nudging the auto industry toward EVs.
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