Hi, everyone! It is my first question on this forum.
I live in China. There is a karting track where I go very often for fun. They have both 4 stroke and 2 stroke rental karts, a private karting club, and a private motorcycle club.
The track was built in a suburb of the city and there is a residential area and a college nearby. April, May, and June are the best months for the track and there are a lot of practicing and racing during this time period. Unfortunately, there are also an increase of complaints over the noise emission during the same time period.
An effective solution must be found to reduce the noise emission, or the track has to be closed. I believe the 4 stroke karts do not impose any serious noise emission problem. The noise that residents and students complain about comes primarily from the 2 stroke karts and motorcycles (which seem to be louder than Rotax Max or IAME X30).
Is there any effective approach to reduce the noise emission by 2 stroke karts and motorcycles? How many decibels does it reduce? How much power loss is introduced by the approach?
So far I have just found exhaust pipe mufflers/silencers. How effective are those silencers?