22 replies to this topic

[Will16]

Curious to see how loud other's Mini's are. I've changed mine and would like to compare it to a stock 998.

Just a list of mods and a decibel reading if possible would be great!

[mr cooke]

1000cc 1275 head, twin carbs , lcb manifold,  RC40 exhaust with only 1 silencer.

can't hear my self think

 

 

 

 

 

[Tommyboy12]

A lot of it is down to the amount of sound insulation installed. That is none in my case so with a single box playmini exhaust its exceptionally noisy! I also suffer a nasty harmonic vibration of the exhaust at exactly 60mph...

[cal844]

With my 998(stripped out, no sound deadning) its loud, my 1275 has sound deadening behind the dash and carpets its alot quieter

Both cars are standard as far as i know, with stage one kit, full exhaust.

998 has a 2 inch full system with DTM back box

1275 has a
1.75 inch maniflow manifold
2.25 link pipe
3 inch piped back box

HTH

[Will16]

Just went out and measured mine with an decibel meter app.

103dB at idle! I need to test it when it's going, much louder!

[mab01uk]

BL launched the 'Quiet Mini' in the Summer of 1980. It incorporated extensive sound-deadening in the floorpan, front bulkhead, dashboard, roof and boot, plus a new headlining material. The effect was to produce what could more accurately be called a 'quieter Mini'. Over the years it was slowly reduced under cost reductions and in the front floorpan area it seemed to promote rust by trapping the water leaks

 

Motor Magazine - July 5th 1980

 

 

[Dr s]

Mine runs a single box rc40, but you can't here that over the induction through the speedo aperture..

[BronkoMini]

Straight cut drop gears, blowing exhaust and just carpet = very loud

[Pauly]

Mine measured 117db in a sound off

[racingbob]

mines nice and quiet as far as the exhaust goes got a maniflow

 

BUT has a larger mid pipe and a 10" wide rear tail pipe

 

has a nice noise from the itg and substack tho

 

but has a nasty harmonic resinance at 3500 ( 60mph )

 

but goes as you rev more

[Dr s]

Did you mean 10 inch tail pipe? Photos please!

[Tommyboy12]

 

but has a nasty harmonic resinance at 3500 ( 60mph )

 

but goes as you rev more

 

I feel your pain on that one. Mine does exactly the same!

[racingbob]

 

 

but has a nasty harmonic resinance at 3500 ( 60mph )

 

but goes as you rev more

 

I feel your pain on that one. Mine does exactly the same!

 

is it like a drone that comes in then goes as you go thro it as go bit quicker

on mine its around 3300 to 3500

I don't know what to do to get rid of it

all I done is put plenty sound deadening and sound proofing to help

and it does help

[666junky]

121 db with a 1330 engine straight through to a 2.5inch exit cherry bomb exhaust ;)

Edited by 666junky, 02 November 2014 - 05:37 PM.

[Cooperman]

My rally car is 95 Db at 5000 rpm at 0.5 metres from the exhaust outlet and at 45 degrees to the centre-line of the car. Thus it meets MSA requirements for historic road rallying. That is with a Maniflow 'cherry-bomb' as the centre box and a reinforced RC40 rear box, all 1.75" diameter in order to achieve optimum power and torque from a 1310 cc engine