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Bonnet Sound insulation for Cooper S
https://www.ausmini.com/forums/viewtopic.php?f=2&t=70253		 Page 1 of 5
Author:  Blue MK2 [ Thu Apr 21, 2011 1:48 pm ]
Post subject:  Bonnet Sound insulation for Cooper S
I have often wondered if anyone out there in Mini land has attempted to reproduce a concourse type copy of the Cooper S Under Bonnet Sound Insulation.

One of my cars still has the original insulation but its pretty tatty and I'd love to make a replacement.

Looks to me like either fibreglass the same as home insulation or possibly rockwool held together or moulded using some sort of adhesive. I would think that whatever adhesive was used would need to at least semi fire proof but what are others thoughts?

I think it would be reasonably easy to make a mould out of an old bonnet using my old insulation if I could find the right glue.

Would love to hear from anyone who has any ideas or has already done it.

Blue MK2
ImageImageImage
Author:  bamnfi [ Thu Apr 21, 2011 3:08 pm ]
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Shows how dumb I am, I didn't know it had it in the first place :shock:
Author:  BBY755 [ Thu Apr 21, 2011 3:37 pm ]
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I've still got the glue from it on the inside of the bonnet - and will leave it there!
Author:  peter1 [ Thu Apr 21, 2011 5:05 pm ]
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I got mine from minisport, and used contact adhesive to fit it - i had to do a little trimming to get it just right, leaving the bracing exposed, and after some 5 years it has not lifted or shown any signs of deterioration. I also used the same stuff for the firewall.
Cheers
Peter.
Author:  Drewie [ Thu Apr 21, 2011 5:56 pm ]
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Maybe see if you could cut one out from under a late model Commodore bonnet they have that same stuff cliped up under the bonnet.
Author:  simon k [ Thu Apr 21, 2011 7:30 pm ]
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the minisport and commodore stuff would be very different to the original... I have mine stored inside a spare bonnet and hung on the wall. Was the safest place I could think of to store it
Author:  Babes [ Fri Apr 22, 2011 11:39 am ]
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I fitted the minisport 4 piece set, huge sound reduction but still amazes me how heavy the bonnet is to lift now.
Author:  winabbey [ Fri Apr 22, 2011 3:30 pm ]
Post subject:  Re: Bonnet Sound insulation for Cooper S
Blue MK2 wrote:
I have often wondered if anyone out there in Mini land has attempted to reproduce a concourse type copy of the Cooper S Under Bonnet Sound Insulation.

I've also wondered the same thing. I have the original fibreglass-style insulation from one of my MK II S's but, given the fragile material and construction, it's seen better days. Surely this material still exists or could be fairly easily recreated? It looks like a thin grey fibreglass mat or batt that's been sprayed with some protective coating on both sides. The coating cracks and pulls away over time.

According to the parts catalogue it is part number 24A959. Somerford are the only suppliers that use this reference, but it's been supeceded by UBS001 which is a four-piece part, presumably a felt-like material. A Google search on fibreglass mat insulation produces a lot of hits but I couldn't find anything that looked the same after ten minutes searching. Does anyone know someone in this undustry that could help?

The mat in the following photos is still in one piece (except for a small detached section) although it looks a lot worse.

Image

Image
Author:  Blue MK2 [ Fri Apr 22, 2011 4:37 pm ]
Post subject: 
The material really does look like fibre glass bats as in house batts and if I had to guess the glue or sealer is like spray on contact adhesive or possibly sprayed latex. This seems to have worked its way gown into the fibres by ten mil or so and the whole this has been pressed ina mould until dry/cured.

As I said a reckon it would not be too hard to make a mould but you could use up a lot of batts trying to get the glue mixture right and I'm a bit worried about its flamability.

I was hoping there would be someone out there that may have seen or worked on a similar process

Blue MK2
Author:  winabbey [ Fri Apr 22, 2011 4:56 pm ]
Post subject: 
I'm not convinced it was 'moulded' as such. It looks to me like a flat blanket of fibreglass mat with a thin coating of something on either side. The blanket is cut to shape and then 'pressed' around the edges and across where the bonnet reinforcing rails run. Maybe steam was involved in the pressing so it maintained its shape. Just offering some theories for discussion.
Author:  Blue MK2 [ Fri Apr 22, 2011 10:35 pm ]
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Not convinced of the blanket theory as the underside (facing motor) has indents for the air cleaners and (I think) the reciculating valve on the manifold.

I do though, think you're right about it being pressed on in some way. Perhaps the press, possibly using steam, is what forms the shape and sticks it to the underside of the bonnet. Perhaps your are right and the press gives a flat blanket all its shape.

Trouble is I still would like to know what the glue material is and how to make one.

Blue MK2
Author:  phillb [ Sat Apr 23, 2011 7:24 am ]
Post subject: 
Blue MK2 wrote:
Not convinced of the blanket theory as the underside (facing motor) has indents for the air cleaners and (I think) the reciculating valve on the manifold.


Wouldn't the Aircleaner etc. have just made their own indentations through contact with the blanke over timet. Have you ever looked at the underside while the bonnet is closed, it's a pretty tight fit.

Like most my car is missing the original under bonnet insulation and I've never had a close look at the original material.

Just thinking logically though, BMC might use some material used else where on the car. For example is it the same material as the original firewall blanket but without the vinyl, or carpet under-felt but just sprayed with loads of glue?
Author:  Blue MK2 [ Sat Apr 23, 2011 10:26 am ]
Post subject: 
Thge underside is pretty certainly moulded in some way. If you look at Winabbey's first photo you can see the elongated depression for the aircleaners and it certainly doesn't look like its just worn in.

I had another thought, perhaps they used a mould for the underside of the insulation (the face facing the engine) but then either put the bonnet, the insulation and the mould in a press to cure. Maybe you could get the same result with a vacume bag.

Blue MK2
Author:  phillb [ Sat Apr 23, 2011 10:39 am ]
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Yes I can see what you mean.

Would be also worth having a look at what they did with other BMC models e.g Marina, 1500, 1800, even P76.
Author:  Morris 1100 [ Sat Apr 23, 2011 11:07 am ]
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I think you have to look at England and not Australia. Maybe what was under the bonnet of the Princess 1100 and the big Austins and Wolseleys.
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