Here's the "noise insulator" urethane perch shims for coilovers...
06-15-2005, 09:26 AM
#1
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Thread Starter
Here's the "noise insulator" urethane perch shims for coilovers...
<center><img src="http://pictureposter.audiworld.com/711/coinsulators.jpg"></center><p>
I dont make/offer these but only sharing what people can do to quiet their coilover's metal-to-metal sounds. However you must follow the correct recipe for material. Any other insulating substrate, hardness or thicknness will cost you longevity, effectiveness and/or ride height. This material, hardness, thickness was not chosen just because I had it lying around. It was chosen because it's worked for me for over 30 years in this application. And NO, rubber is not the same no matter if its Shore A hardness is identical and its price a LOT cheaper. There's only "one" right and everything else is a compromise.
This is cast urethane sheeting. .0625" (1/16") thick. It is 90 Durometer Shore A hardness. It IS expensive! And cutting it to these shapes by X-acto knife/scissors is anything but fun.
But it will out-live the car and the coilovers and while it cant get you quite back to standard spring quietness it is as close as you will EVER get with coilovers.
Picture Detail:
Left;
Upperlower spring perch with urethane insulator
Middle;
Upper/lower spring perches w/o insulator
Right;
Upper/lower urethane insulators
Just an FYI for those that only want the VERY finest...
I dont make/offer these but only sharing what people can do to quiet their coilover's metal-to-metal sounds. However you must follow the correct recipe for material. Any other insulating substrate, hardness or thicknness will cost you longevity, effectiveness and/or ride height. This material, hardness, thickness was not chosen just because I had it lying around. It was chosen because it's worked for me for over 30 years in this application. And NO, rubber is not the same no matter if its Shore A hardness is identical and its price a LOT cheaper. There's only "one" right and everything else is a compromise.
This is cast urethane sheeting. .0625" (1/16") thick. It is 90 Durometer Shore A hardness. It IS expensive! And cutting it to these shapes by X-acto knife/scissors is anything but fun.
But it will out-live the car and the coilovers and while it cant get you quite back to standard spring quietness it is as close as you will EVER get with coilovers.
Picture Detail:
Left;
Upperlower spring perch with urethane insulator
Middle;
Upper/lower spring perches w/o insulator
Right;
Upper/lower urethane insulators
Just an FYI for those that only want the VERY finest...
06-15-2005, 11:05 AM
#4
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does 1/16 of an inch really supress that much noise?
what is the density of urethane? Besides longevity, I can't imagine it does more than rubber especially at that thickness.
06-15-2005, 12:53 PM
#6
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hmmm
I'm just wondering what the diff is between rubber and urethane in noise suppression and the density levels. You seem pretty precise and I thought you would have some numbers for me.
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06-15-2005, 01:33 PM
#9
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Thread Starter
no silly. It was/is a recommendation only. People can try their own material....
I encourage everyone to try a thousand items like I did 25-30 years ago. But for those who want to get right to the correct answer, bypassing a myriad of less effective materials and thicknesses, (not to mention a LOT of strut R&R's and hand-cutting as 4 are required at each end of the car in EVERY material tried) I offered a short-cut. Sometimes ya just dont get to know how/why something works. It just does. Hell, I aint figured out where the "white" goes when snow melts. But it doesnt look like milk running down the street gutters.
