Correct material for stopping vibration in engine bay

[jakesmith]

I’ve located the source of some resonance / I’ve located the source of some resonance / rattle in my R8, it is the carbon engine cover on the right, if I tap it, it rattles, the screws are all tight, so I am planning to stick something to the underside to stop it vibrating.

it’s 100% definitely part as the rattle stopped as soon as I removed the piece.

if it was the interior I’d use felt. But is that suitable in the engine bay due to water / heat? Don’t want to cause a fire.

I have stuff called Silent Coat which is like Dynamat, used for soundproofing doors when including speakers. it’s like sheets of bitumin backed with adhesive and a reflective coating on one size. Says it is designed to stay sticky at temperature but doesn’t mention engine bays. Fear is the bitumen like adhesive could become soft at heat and seep off / make a mess

Or I could buy something designed for heat proofing but not sure how effective that would be stopping vibrating

[droopsnoot]

I know there's stuff that classic owners use on the inside of the bonnet to keep noise down, it's whether your engine bay gets warmer than that.

https://www.woolies-trim.co.uk/c-128-heat-deflecti...

(I haven't tried any of the above, I'm still in the "thinking about it but more important stuff to do" stage)

[InitialDave]

There's sound deadening products that are meant for going under bonnets, yes, I'd imagine they would be fine for this application.

Worth seeing if you can find out if there's meant to be something there anyway, it's quite possible someone removed it and you can get a used one.

[Baldchap]

InitialDave said:

Worth seeing if you can find out if there's meant to be something there anyway, it's quite possible someone removed it and you can get a used one.

I'll bet there's something on from the factory that has fallen off or not been replaced during service.

Any sticky out bits that could have had bungs on previously?

[SturdyHSV]

Should there be a washer or a spacer or something underneath where the screw (bolts?) mount the cover?

If the fittings are tight but there's still movement, I'd be tempted to just put a washer or some such underneath the cover to take up the slack? Or at least space the cover up a bit away from whatever it's rattling against if that's how it's making the noise...

Disregard if I've gotten the wrong end of the stick

[GreenV8S]

Is it moving where the screws are, or is there a part of it that is so far from the screws that it can flex? I doubt it would have left the factory with such an irritating fault so I suspect you're missing a screw/clip/spacer of some sort.

[InitialDave]

Baldchap said:

I'll bet there's something on from the factory that has fallen off or not been replaced during service.

Any sticky out bits that could have had bungs on previously?

I was more thinking that a previous owner removed a sound deadening pad from the underside of the cover,believing they would get more engine noise from doing so, it wouldn't be the first time I've seen it.