As of March 2003:
A stock 2006 V Rod makes 95-96 db outside of our dyno room, in the shop, 15ft away.
|The decibel scale is based on a logarithmic equation (similar to
the Richter scale for measuring earthquakes).
If a sound source increases by 6dB, it has twice the SPL (sound pressure level). For us to actually perceive a sound to be twice as loud, it needs to be increased by 10dB.
That means that a 12dB increase is four times higher SPL, but we perceive it only a little more than twice as loud.
OSHA (Occupational Safety and Health Administration) has laws regarding sound level exposure times for people working in loud or noisy environments for extended periods of time.
|SPL in DbA||Maximum daily exposure in hours|
OSHA 2206 (1978)