Your Motorcycle is a Giant Vibrator

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So…is your motorcycle actually a giant vibrator?

Not exactly. But also…not entirely not. Here’s the science behind it:

In a 4-stroke engine, each cylinder fires once every two crankshaft revolutions. In a 4-cylinder engine, that works out to roughly two combustion events per revolution across the engine as a whole.

So at 6,000 RPM, that’s about 200 combustion pulses every second.

What reaches the rider is obviously not a perfect 1:1 transfer of engine firing frequency. Vibrations get filtered, damped, shifted, and transformed by the engine design, mounts, chassis, suspension, seat, and resonance characteristics.

But some of that mechanical energy absolutely makes it to you. That’s why different bikes feel different. An inline-4 feels nothing like a Harley V-twin. A Ducati V4 has its own very distinctive personality.

And while rider-perceived vibration isn’t identical to combustion pulse frequency, some of the frequencies humans perceive from vibrating systems can overlap with some very familiar territory.