It's a little known fact that " Hello Kitty " stickers have the Highest sound attenuation properties of all stickers !
Hood Insulation (for Sound, not Heat)
- Thread starter SSTJ
- Start date
It's a little known fact that " Hello Kitty " stickers have the Highest sound attenuation properties of all stickers !
Ok, I've updated the original post with the product suggestions so far.
As usual, I'm overthinking this. I don't even think that the hood is the route for most of the engine noise coming into the tub. More likely it is directly through the firewall. Still, interesting to know what the options are.
I'm thinking about just getting a roll of very thin closed-cell foam, and also some mass-loaded vinyl, and just doing it the "SoundDampenerShowdown" way. Plus then I'd have those materials for whenever I pull the dash and do the firewall. But I need to look into the heat capacity of MLV products.
As usual, I'm overthinking this. I don't even think that the hood is the route for most of the engine noise coming into the tub. More likely it is directly through the firewall. Still, interesting to know what the options are.
I'm thinking about just getting a roll of very thin closed-cell foam, and also some mass-loaded vinyl, and just doing it the "SoundDampenerShowdown" way. Plus then I'd have those materials for whenever I pull the dash and do the firewall. But I need to look into the heat capacity of MLV products.
What about a different tact?
An engine cover?
You look at the 3.6 JK and it's a thin plastic shell and a big block of foam. Lots of engines/manufacturers do that these days.
Perhaps another tactic?
-Mac
An engine cover?
You look at the 3.6 JK and it's a thin plastic shell and a big block of foam. Lots of engines/manufacturers do that these days.
Perhaps another tactic?
-Mac
you want mass and squish. Mass so it takes more energy to excite it and squish so the energy can be absorbed and dissipated instead of passing through.
I think the comment that most of the noise is coming through the firewall is probably correct, but if you have a "sound sink" under the hood it can still cut down on what comes through the firewall by absorbing instead of reflecting it and bouncing it around. If you ever have to do a heater core job, maybe be ready with some sound mat to line the firewall while you have access. I'll probably do that myself.
I think the comment that most of the noise is coming through the firewall is probably correct, but if you have a "sound sink" under the hood it can still cut down on what comes through the firewall by absorbing instead of reflecting it and bouncing it around. If you ever have to do a heater core job, maybe be ready with some sound mat to line the firewall while you have access. I'll probably do that myself.
Yep, I think that's what SDS has in mind with the recommendation of butyl tiles, followed by a thin layer of closed-cell foam, followed by mass-loaded-vinyl.
Is there any sense in adding it inside the cab, on that side of the firewall?
I'm not an acoustic engineer but I think so. It's mass so it should require more energy to get through the firewall, and if it's soft it should still dissipate the sound waves.
Yep, agreed. Most other sound dampening materials are placed inside the cab. And trying to apply it on the engine-bay side would be difficult. More likely to deteriorate or fall off over time too.
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