As I'm tearing down my car, one of the last parts to come off were the firewall insulation parts.
My parts are quite damaged, and I'm looking to replace them, so I looked into various options, as the BMW part is no longer available.
As my parts are quite disintegrated, I couldn't tell if they are 2 or 3 parts, but this is how they looked when glued back together:
Front:
Backside:
Top part is definitely one part (removed and placed backside pointing upward):
Bottom part was broken into pieces, and the right side was already missing on my car:
Bottom part with the ALU heatshield removed to preserve for possible re-application on new part.
These parts are made of a cast PU (polyurethane), they are not made from a stamped foam sheet material as can be concluded from the skin forming, the various thickness, and the 3D shape of the part. It also has a hatched pattern of horizontal and vertical lines running about 4mm's apart on most of the surface:
Here's a picture from @deQuincey showing a clean & perfect OEM top part Sound insulation #51481810724, also showing the hatched pattern for reference:
As I want to replace it, I'm looking for the most accurate part to buy.
Now these questions come up:
- Where they originally 2 or 3 parts?
This is how it looks on the RealOEM (parts books copy): 2 parts:
first drawing shows #4, Sound insulation #51481810724 being the upper section. And a 2nd image with #6, sound insulation dash panel #51481811933 being the lower section (eventhough drawn on top)
Available sources of repro parts show various options:
CS-werke has repro's available in 3 parts: (400 euro in total - status March 2025)
bottom left side:
OIL's Design has 2 parts:
Walloth show 3 parts, of which only the bottom left is available currently for 178 euro (status March 2025)
Top:
Bottom right and bottom left: (for LHD cars)
I have also seen images of a piece which scratches easy - it appear to me to be a sandwhich of a foam with heavy, dark grey 2 mm thick sheet.
- What do you have, and if it's one of the Retro parts, what's your opinion?
- I am a sucker for originality, so if anyone has an original BMW produced one - Please PM me.
My parts are quite damaged, and I'm looking to replace them, so I looked into various options, as the BMW part is no longer available.
As my parts are quite disintegrated, I couldn't tell if they are 2 or 3 parts, but this is how they looked when glued back together:
Front:
Backside:
Top part is definitely one part (removed and placed backside pointing upward):
Bottom part was broken into pieces, and the right side was already missing on my car:
Bottom part with the ALU heatshield removed to preserve for possible re-application on new part.
These parts are made of a cast PU (polyurethane), they are not made from a stamped foam sheet material as can be concluded from the skin forming, the various thickness, and the 3D shape of the part. It also has a hatched pattern of horizontal and vertical lines running about 4mm's apart on most of the surface:
Here's a picture from @deQuincey showing a clean & perfect OEM top part Sound insulation #51481810724, also showing the hatched pattern for reference:
As I want to replace it, I'm looking for the most accurate part to buy.
Now these questions come up:
- Where they originally 2 or 3 parts?
This is how it looks on the RealOEM (parts books copy): 2 parts:
first drawing shows #4, Sound insulation #51481810724 being the upper section. And a 2nd image with #6, sound insulation dash panel #51481811933 being the lower section (eventhough drawn on top)
Available sources of repro parts show various options:
CS-werke has repro's available in 3 parts: (400 euro in total - status March 2025)
bottom left side:
OIL's Design has 2 parts:
Walloth show 3 parts, of which only the bottom left is available currently for 178 euro (status March 2025)
Top:
Bottom right and bottom left: (for LHD cars)
I have also seen images of a piece which scratches easy - it appear to me to be a sandwhich of a foam with heavy, dark grey 2 mm thick sheet.
- What do you have, and if it's one of the Retro parts, what's your opinion?
- I am a sucker for originality, so if anyone has an original BMW produced one - Please PM me.
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