Apart from power output, bank angle and engine location and your interest in buying one what separates the Toyota Avalon V-6 from the Porsche flat-six. At full tilt, the Porsche screams out a violent mechanical rasp because the Avalon comes out with a non-threatening mutter. How two engines with the same cylinder configuration can sound different from each other?
Before we go into that let us have some explanation of what sound is. It is basically made up of vibrations which disturbs the air pressure and reach the human eardrums. How many times the frequency or Hertz of the sound wave oscillates in a second decides what our brain would process and defines it as different pitch. Higher frequency is associated with high pitch and the lower the obvious. Under load, your car engine generates a range of frequencies but the root note is the one on which the musical sound is built on which is known as the dominant frequency.
The pitch goes up and down according to the rev range of the engine and according to the calculation 60rpm equals one revolution per second or 1 HZ and the V-6 rotating 1800rpm is speeding 30Hz. Each cylinder fires and produces a bang and this may vary with the revolution of the crank. With a four stroke engine, you shall multiply the 30-Hz value three times more thus coming to the conclusion of 90-Hz for a six-cylinder engine at 1800 rpm.
The sound of both the six-cylinders in Toyota and Porsche appear different because the vibrations produced by both engines are controlled by several variables and plumbing. The throaty sounding engines have high orders of firing frequencies such as 2.5 to 3.5 times. But how the Toyota and Porsche engines differ in sounds? It is for the same reasons that people don\'t hear Motley Crue by going to the Met.