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Cabin Noise


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#1 Pickwah

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Posted 11 March 2019 - 01:08 PM

Afternoon all

I've done everything I can think possible to quieten the cruising noise of my mini. I run the original air cleaner, a twin box rc40 stainless system. The car is covered in silent coat and has further deadening a full carpet and may set. I have insulation both sides of the dash.

My issue is cruising at 60mph (4000rpm) I have a horrible harmonic drone which makes conversation impossible!

I really can't think of anything else other than fitting rubber subframe mounts to combat this noise!

Any input would be greatly appreciated!

#2 Retroman

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Posted 11 March 2019 - 01:23 PM

Another engine stabilizer ?

Bonnet felt

Roof felt

Door under card membranes + tape

Different exhaust

earplugs....



#3 unburntfuelinthemorning

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Posted 11 March 2019 - 01:37 PM

My van is noisy at all times but I think I know what you mean as I get a similar thing at about the same speed.  I wonder if it is a characteristic of the standard induction setup.  What setup do you have, mine's standard late 70s 998.

 

The article posted in post #10 of the following thread talks about a boom around this speed.

 

http://www.theminifo...1-a-quiet-mini/



#4 Pickwah

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Posted 11 March 2019 - 01:48 PM

Another engine stabilizer ?
Bonnet felt
Roof felt
Door under card membranes + tape
Different exhaust
earplugs....



#5 Pickwah

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Posted 11 March 2019 - 01:48 PM

Another engine stabilizer ?
Bonnet felt
Roof felt
Door under card membranes + tape
Different exhaust
earplugs....


The car is running solid subframe mounts, a top and bottom engine steady with poly bushes. The roof felting is the standard 'strip' from out of the factory. The bonnet has some deadening pads, yet to fit the felt. Annoying thing is if I take the car to say 4500rpm the tone changes and is more bareable

Edited by Pickwah, 11 March 2019 - 01:52 PM.


#6 Retroman

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Posted 11 March 2019 - 02:25 PM

Whatever you do it will never be quiet, its a Mini, designed in the 1950's when folks were more used seat of the pants driving with lower speeds and more noise. Personally I would strip all the sound deadening out of it and go faster....you will then be concentrating on driving more and never notice the noise hahah And with less weight to drag round it will accelerate and stop quicker and give better fuel figures.



#7 luismx123

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Posted 11 March 2019 - 02:48 PM

Whatever you do it will never be quiet, its a Mini, designed in the 1950's when folks were more used seat of the pants driving with lower speeds and more noise. Personally I would strip all the sound deadening out of it and go faster....you will then be concentrating on driving more and never notice the noise hahah And with less weight to drag round it will accelerate and stop quicker and give better fuel figures.

AAAAAAND, when its more noisey, passengers will not want to drive along, so less weight there too ;)

Nah all jokes aside, mine is also fairly loud on the autobahn, but thats part of it. Dont think anymore will help that much.... 



#8 Wiggy

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Posted 11 March 2019 - 05:12 PM

The other alternative is to change the Final Drive Ratio. Might be a bit drastic, but depends on how much it annoys you.

#9 Magneto

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Posted 11 March 2019 - 05:42 PM

I went to a 2:76 in my previous Mini and it made a huge difference - except then you also hear all the road noise and wind noise that the engine noise was covering up!

 

I wear ear plugs now for longer drives, makes things much nicer......



#10 Midas Mk1

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Posted 11 March 2019 - 06:42 PM

It’s a Mini.

#11 Dusky

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Posted 11 March 2019 - 07:47 PM

Sound deadning ( heavy stuff)on the following panels (note :only apply all patches, no need to load the entire panel)
:boot floor
-rear seat backing
-parcel shelf
-bonnet
-inside the doors

Fit sound absorption on the following panels:
Underside of the bonnet
Behind the dash
Boot side of the rear seat back panel.

Make sure all screw holes and grommets are properly closed on the bulkhead.

I spent 50 euro max on materials and it totally transformed the car.

#12 Richie83

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Posted 11 March 2019 - 08:18 PM

solid mounts won't help in this scenario surely? My yellow mini is solid mounted and everything resonates much worse than my saloon. 



#13 Pickwah

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Posted 11 March 2019 - 09:50 PM

Sound deadning ( heavy stuff)on the following panels (note :only apply all patches, no need to load the entire panel)
:boot floor
-rear seat backing
-parcel shelf
-bonnet
-inside the doors

Fit sound absorption on the following panels:
Underside of the bonnet
Behind the dash
Boot side of the rear seat back panel.

Make sure all screw holes and grommets are properly closed on the bulkhead.

I spent 50 euro max on materials and it totally transformed the car.


That's a good idea, at the minute Ive fitted 2mm silent coat sheets to the floor and half way up the bulkhead inside. I then fitted the felt under the carpet. I'm yet to do the rear seats and the boot as I think the majority of the noise is from the front!

I know Minis aren't supposed to be quiet, but my other car was never this loud. I've only just rebuilt the cars Gearbox and really don't fancy changing the f/d.. this would ruin the cars drivability anyway

Edited by Pickwah, 11 March 2019 - 09:54 PM.





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