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S1 Mini-Project: Engine Cover Sound Insulation


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Cracking work Tony. I really must try it on the S2. I was only thinking over the last week when I've been doing quite a few motorway miles that, at 'entusiastic' crusing speeds, it's just too loud and uncomfortable, can't hear the radio or the passenger!

Does the stuff have a particular name?

Pete

Pete '79 S2

LEW Miss September 2009

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Thanks for the kind words, Christopher and Pete. :)

Pete, I don't know the name or source for the material, but it is part number 928-556-285-02-M260 for a Porsche 928. I'd love to find the big waffle iron batch from which they are cutting the 928 pads and buy some in bulk, or maybe commission a run of Esprit insulation pads.

Do note that I edited the last full paragraph, talking about containing heat. I'd like to do a bit more experimenting (perhaps running with this cover and with 155H's uninsulated cover back to back for comparison, maybe checking with an infrared gun, etc.) to be able to make more conclusive statements about what to expect before others go out and spend their money. I'm happy with it so far, but allow me to be the guinea pig for a little bit longer.

- T

Edited by Tony K

Tony K. :)

 

Esprit S1s #355H & 454H

Esprit S2.2  #324J

1991 Esprit SE

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It sounds as though it's worth doing this but at $270 it isn't cheap. Would Dynamat have done the same job and been cheaper? Or would it not stand up to the rather harsh environment?

Cheers, Paul.

Edited by Paul Coleman
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Lotus Esprit [meaning] a 1:1 scale Airfix kit with a propensity to catch fire

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Tony great thread, thanks for sharing.

Good timing as I was actually thinking of possible/different ways to do reduce the noise coming from the engine.

Could you share the cutouts' dimensions for the alternator and timing belt areas ?

Best.

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Hey whats wrong with this wreck? We`re getting gas back here.

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It sounds as though it's worth doing this but at $270 it isn't cheap. Would Dynamat have done the same job and been cheaper? Or would it not stand up to the rather harsh environment?

Cheers, Paul.

Hi Paul,

I didn't consider Dynamat because I wanted to get reasonably close to original (i.e. foam). But giving it consideration now, here are some questions I'd raise: 1) it's heavier than the foam -- might make the engine cover heavy to lift? 2) In how many separate pieces would it be applied?-- more edges to start peeling off, or do they sell it in big sheets?; and 3) Will Dynamat adhere well to the cover, and will the adhesive withstand the heat? These are some of the considerations I gave to other materials, and why I thought the Porsche stuff would work. Again, I was giving a nod to originality in choosing foam (even though it's not the same), and in making the pieces the same shape; but if you think Dyanamat might do it, give it a shot. :)

As a lower cost alternative, it might be possible to pull it off with three pads from a Porsche 944, if you don't mind piecing it together with odd shaped/sized pieces. The 944 liners have a bumpy texture instead of a grid, are a bit smaller, and cost significantly less than the 928 piece. 3 944 pads might cover it, 4 definitely would (probably not in the original pattern, though. I decided that I won't miss the extra money spent on three 928 pads, but if I took a shortcut and hodge-podged it together, I'd be looking at it for the life of the time it's on there. I also see an advantage to using only four large pieces per original in that there are fewer edges to start to hang down (not that I think the Porsche stuff will do that).

Tony great thread, thanks for sharing.

Good timing as I was actually thinking of possible/different ways to do reduce the noise coming from the engine.

Could you share the cutouts' dimensions for the alternator and timing belt areas ?

Best.

Hi Hemlock,

I just "eyeballed it" (estimated) from looking at the photograph. The round hole is about 5.5-5.75 inches (sorry, ruler doesn't have cm), and the U-shaped cutout is about 6 inches wide and 7 inches high. I believe I cut them a little bit larger than the originals. I did this intentionally because I knew I wouldn't get them in the exact position, plus my alternator is in a slightly different position due to 454H having air conditioning.

Really, I'm not even sure if the cutouts are necessary or even in the correct location; the thinner material may not interfere. I just cut the pieces out because Lotus had done it, and enlarged them slightly to account for if they might not be in the right place. For what it's worth, after 2500 miles, there are no marks on the foam from anything touching it.

I think that if you just mimic the photo closely, it will be good enough. You might want to sit in the car with the engine cover in place, turn around and look out the bulkhead glass, and note the position of the pulleys while someone lifts/tilts the cover away from the engine.

are you taking orders Tony?

I'd love to find this material in bulk and cut a bunch of them out for everyone . . . . :animier:

Edited by Tony K

Tony K. :)

 

Esprit S1s #355H & 454H

Esprit S2.2  #324J

1991 Esprit SE

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  • 7 years later...

Hi David, 

  It took three 928 insulation pads.   As an update, now seven years and about17K miles later, it is holding up well, only slightly damaged where the coolant expansion tank nearly touches it.   :)

- Tony K

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Tony K. :)

 

Esprit S1s #355H & 454H

Esprit S2.2  #324J

1991 Esprit SE

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  • 2 weeks later...
On 27/04/2010 at 03:55, Paul Coleman said:

Would Dynamat have done the same job and been cheaper? Or would it not stand up to the rather harsh environment?

 

Awesome job Tony!

I'm thinking of doing a similar thing but with Dynamat Hoodliner acoustic foam. It's 3/4" thick, with a cleanable aluminised skin.

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Hi,

I ordered some of that NASI soundproofing from Germany and applied it to the inside of my newly restored S1 engine cover. Looks great and can't wait to test (another 8 months away).

Unfortunately I've hit TLF buffers for uploading photos. Not sure what all that is about. So I've posted them on the Facey B Esprit Group if interested.

@Tony K I sent you a DM from Facey B. Not sure if you realise. Facebook is odd like that.

Thanks for the heads up on this stuff.

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  • 3 years later...
On 26/04/2010 at 08:53, peteyg said:

I really must try it on the S2.

Pete, now that you´ve had about 10 years to put your S2 sound insulation plan in action, how did you get along?

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@marode

Ha, I've not done a single thing about it!! I guess I've just decided to enjoy the noise whilst I still can and if I want to go somewhere in quiet comfort I'll take the wife's car!

Pete

Pete '79 S2

LEW Miss September 2009

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