foam under hood sound isolation
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Three Wheelin'
Joined: Jan 2003
Posts: 1,993
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From: Netherlands
foam under hood sound isolation
Well, I just bought a nice piece of sound deadening material for engine bays. It's black and has a top layer that won't absorb liquids etc. Looking good but I think it's too thick. It is 25 mm (1 inch) thick so it is thicker than original and stick out above the ridge of metal. What thickness was the original? I can't tell, it's no longer there...
Instructor
Joined: Jan 2014
Posts: 232
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From: Oahu, HI
I know you already have your own material but thought I would pass this along...
This one seems to be a popular choice over the OE liner (in 6.5 & 13mm sizes)... This link is to Rob Budd's shop but I think it is carried elsewhere too...
http://www.classic9leathershop.com/bonnet-liners-for-porsche/hood-bonnet-liner-heat-shield-for-porsche-928-automobiles/
This one seems to be a popular choice over the OE liner (in 6.5 & 13mm sizes)... This link is to Rob Budd's shop but I think it is carried elsewhere too...
http://www.classic9leathershop.com/bonnet-liners-for-porsche/hood-bonnet-liner-heat-shield-for-porsche-928-automobiles/
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From: Phoenix AZ
25mm thick is too thick by far for a hood liner - you won't be able to make it look right, similarly 6.5mm is too thin...
I dislike the stock liner - I think it looks cheap and it really does not hold up well in the long term.
I have used 1/2" (~12.5mm) aircraft bulkhead nitrile foam SP-500 from Wickes Aircraft Supplies This material is very heat resistant, fire retardent etc. I have had it installed for 8 years and it still looks exactly as new (in the Phoenix heat driven ~every day).
Its thicker than the stock foam which to me means you get a superior (snug) fit at the edges - cut a little large and tuck the excess for a perfect finish. One side is bare foam (glue) and the other is a smooth vinyl (visible finish).
Alan
I dislike the stock liner - I think it looks cheap and it really does not hold up well in the long term.
I have used 1/2" (~12.5mm) aircraft bulkhead nitrile foam SP-500 from Wickes Aircraft Supplies This material is very heat resistant, fire retardent etc. I have had it installed for 8 years and it still looks exactly as new (in the Phoenix heat driven ~every day).
Its thicker than the stock foam which to me means you get a superior (snug) fit at the edges - cut a little large and tuck the excess for a perfect finish. One side is bare foam (glue) and the other is a smooth vinyl (visible finish).
Alan
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From: Phoenix AZ
Well I've posted about it before - but here are 2 pictures one from mid 2006 when first installed and one from mid 2014 - 8 years later. I can't really tell any difference... looks and feels the same.
After 8 years the stock version was already getting a bit brittle, after 12 years it was falling off in chunks
Use 3M 80 spray adhesive - many others do not hold up at all well with high heat...
Alan
After 8 years the stock version was already getting a bit brittle, after 12 years it was falling off in chunks
Use 3M 80 spray adhesive - many others do not hold up at all well with high heat...
Alan
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From: Double Oak, TX
We sell only the stock original foam insulation and Porsche has improved it.
So simple to fit and looks like it came straight from the factory.
So simple to fit and looks like it came straight from the factory.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
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Alan
