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Yup, that was the issue. As I say, now sorted.

If it is the drumming noise you want to get rid of, I would guess it may be best to use self adhesive bitumen based sheets. Like Dynomat.
Then you could put it on the inside rather than the engine bay.
You will learn to love the stuff!

I reckon the triangular sound deadening under the bonnet ois well worth doing. I does cut down on the noise & it also gives the bonnet a good weighty feel.

I have it on nearly all my cars.

If its not an originality thing- would something like dynamat work with the sound deadening situation? It's what it's made for, and pretty durable stuff... just not cheap.

https://www.dynamat.com

Joel Welsh 4769VU wrote: ↑Wed Mar 15, 2023 3:49 am If its not an originality thing- would something like dynamat work with the sound deadening situation? It's what it's made for, and pretty durable stuff... just not cheap.

https://www.dynamat.com

Here is a cheaper alternative to Dynamat
They offer both: Butyl- and felt based insulation.

https://www.heatshieldings.com/en/sound-insulation/

For max sound deadening, combination of anti drum pads and sound insulation might work well ?

Update on the Minispares bonnet triangles… they still fall apart after the first run up the road!!!

That’s odd. I put mine on and have done 800 miles since. No problem and no signs of fatigue at all.

Just fitted the Minispares kit under the bonnet of my Mk1. Had to chop all 4 pieces to make them fit. Very poor Minispares.

snoopy64 wrote: ↑Thu Apr 20, 2023 5:28 pm Update on the Minispares bonnet triangles… they still fall apart after the first run up the road!!!

Oh Great!

I had been assured that they had chucked all the duff stuff out & replaced it with original hardura.

I've always had good reports on Dynamat and companies like CMC - Bridgenorth - top Jaguar restorers use it.

It's very difficult is it not without a 'Which' style report however to make an informed decision, and one that I have to shortly make. However back to the question is it worth doing? and I believe it makes all the difference, noise is very tiring...

But is it original

You could use sound deadening Matt you just peel off the back and stick it on warm up the metal with a heat gun

Did this fall off the bonnet or fall apart ie disintegrate ?

snoopy64 wrote: ↑Thu Apr 20, 2023 5:28 pm Update on the Minispares bonnet triangles… they still fall apart after the first run up the road!!!

rolesyboy wrote: ↑Sat Apr 22, 2023 7:29 am Did this fall off the bonnet or fall apart ie disintegrate ?

snoopy64 wrote: ↑Thu Apr 20, 2023 5:28 pm Update on the Minispares bonnet triangles… they still fall apart after the first run up the road!!!

If you use aerosol adhesive, I suggest you mask up around the intended areas, as you need to give it 3 coats leaving for a few minutes between the coats and wait at least 5 mins before fitting them..or better still use the old dunlop type treacle glue in a tin, but only one coat on each side and wait 10+ minutes before fitting, too much of this glue and it will work through the felt stuff and un glue the black vinyl part...ask me how I know this
Mine where done like this 5 years ago and haven't budged since

Hi

It has separated, the black ‘vinyl’ layer has come away from the thicker layer… it’s well and truly stuck to the bonnet!

mk1 wrote: ↑Fri Apr 21, 2023 9:33 am But is it original

Would I be correct that no minis were supplied from the factory with under bonnet insulation? if it was are there any images available?

My choice would be to fit under the bonnet with something period looking, elsewhere it's not going to be seen once carpets, seats, dash are fitted and dynamat or something with a less shiny finish could be used elsewhere. Fitting certainly does give the car a more solid feel...

Most minis had bonnet sound deadening, it was the fiber stuff that fell to bits

Here's my original 67

Nick W wrote: ↑Sat Apr 22, 2023 12:15 pm Here's my original 67

Thanks Nick that's most useful...

Shorrock supercharger! Wow!!