Which is louder 50cc or 80cc?

Gator Wrestler

New Member
Jan 22, 2009
Springfield LA
The amount of sound produced by an engine is directly related to the volume of exhaust gas produced by the combustion. A good anology is a firecracker. The larger the explosion the more gas that is being produced. Gas (not the fuel). The gas causes the sound by being accelerated beyond the speed of sound. Anything moving faster than sound will create a boom that is proportional to the volume of the thing that is moving. This would be more noticible without a muffler. Here's a small experiment: try clapping your hands, first just hard enough to make a sound. Then clap as hard as you can. Notice the difference in the level of sound?

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
up north now
Port timing can also make a large difference in the sound/volume/noise/whateva.

The sound of one trolls' hand clapping is completely different. ;)