revvedmoto
Mechanical
- Dec 17, 2023
- 4
Hopefully, this is the right place to answer my questions. I recently picked up a motorcycle dyno that is placed in a metal shipping container where one side and back doors open while in use. Long story short I've gotten a few complaints about it and want to try and understand what my neighbors are hearing and coming up with a plan of attack to remedy the issue.
For all intents and purposes, we are talking about a Harley Davidson producing 115db at around the 50Hz mark and up.
I'm about 45ft from my closest property line and the other is 140ft (this is the neighbor that has been complaining). I dont expect my results to be silent but to slide a little more under the radar. We are by a busy street that creates 85-90db (measured at the road) pretty consistently and even has big trucks going by with their jack brakes on.
I've been playing with this little app here to help me understand what db they are hearing.
[1.5,50,115]&receiver=[2,45]&barrier=[0]&display=2
My first question is how is the reverb off the container hurting me? I would imagine that as the sound is ricocheting around the container it may sound like a herd of 115db bikes instead of a single bike.
The second question is about motor mechanical noise vs exhaust note. Most of the bikes ill see will have an altered exhaust and will be much louder than stock but I would be curious how much of my issue is intake and mechanical engine noise? If I were to feed my exhaust into a silencer such as one of these
If I keep the dyno in this container I plan to pad the walls and ceiling. A friend has some experience with soundproofing on trains and has some sort of foam that he speaks highly of. It's expensive stuff so I don't plan to wrap the whole thing top to bottom with it. I've seen some wall treatments that studio guys will make out of fiberglass insulation that I would finish off the room with. I'm curious if that will even accomplish much?
The last resort is to build room for the dyno. This would be a room inside a room thing and in the end might be the route I have to go. I would hate to lose precious shop space and more importantly the cost of building it out.
I would be curious about your thoughts and if there is something I'm not considering.
For all intents and purposes, we are talking about a Harley Davidson producing 115db at around the 50Hz mark and up.
I'm about 45ft from my closest property line and the other is 140ft (this is the neighbor that has been complaining). I dont expect my results to be silent but to slide a little more under the radar. We are by a busy street that creates 85-90db (measured at the road) pretty consistently and even has big trucks going by with their jack brakes on.
I've been playing with this little app here to help me understand what db they are hearing.
[1.5,50,115]&receiver=[2,45]&barrier=[0]&display=2
My first question is how is the reverb off the container hurting me? I would imagine that as the sound is ricocheting around the container it may sound like a herd of 115db bikes instead of a single bike.
The second question is about motor mechanical noise vs exhaust note. Most of the bikes ill see will have an altered exhaust and will be much louder than stock but I would be curious how much of my issue is intake and mechanical engine noise? If I were to feed my exhaust into a silencer such as one of these
https://maximsilencers.com/silencers/exhaust-silencers/m42-super-critical-chamber-exhaust-silencers/
I may be able to chop the exhaust down by 15+ db.If I keep the dyno in this container I plan to pad the walls and ceiling. A friend has some experience with soundproofing on trains and has some sort of foam that he speaks highly of. It's expensive stuff so I don't plan to wrap the whole thing top to bottom with it. I've seen some wall treatments that studio guys will make out of fiberglass insulation that I would finish off the room with. I'm curious if that will even accomplish much?
The last resort is to build room for the dyno. This would be a room inside a room thing and in the end might be the route I have to go. I would hate to lose precious shop space and more importantly the cost of building it out.
I would be curious about your thoughts and if there is something I'm not considering.
