morris minor burble

[green123]

hello my Morris minor has the standard exhaust. the one thing the car doesn't do is burble could anyone explain why my car doesn't do it. the car was parked up for 20 years before I had it. I just like the noise and would like my car to do it. the exhaust has also been painted at some point and looks quite black many thanks

[MarkyB]

It does vary between cars for some reason.
I was concerned that fitting a stainless exhaust might stop it but it didn't.
If the car is standard I'd look at the carb to be sure the piston falls with a good clunk.
The burble happens on the over run so this may play a part.

[chrisryder]

It seems to be that new exhausts do it best, and as they build up with carbon inside in time, this muffles and mutes it.

My sisters Minor had a new stainless system when restored, and burbled like a trooper. My dads Minor has had a stainless system on since we got it (1994) and hasn't given a hint of burbling in my memory (...I was 5 when we got it though).

[73 XTX]

I'm no expert but have heard that it has something to do with how far the end of the exhaust pipe sits from the back bumper.
It could relate to pressure differentials around the rear of the car.

Rob.

[bmcecosse]

Nothing to do with bumper........

[JOWETTJAVELIN]

Apparently the trademark noise can be tuned out completely by increasing the length of the tailpipe. So the question is what length exhaust do you have fitted for one thing.

[green123]

the exhaust length is original length and looks to be the original exhaust but was painted to protect it from rust and looks full of carbon inside the exhaust perhaps its time for a new exhaust

[mike.perry]

I have a 6in chrome extension on the end of the stainless steel exhaust on my Series MM which finishes just beyond the back bumper. It makes the exhaust a lot quieter from inside the car.
Travellers and vans seem to have the noisiest exhausts despite having different systems, maybe it is because of the body shapes

[chrisryder]

Travellers and vans seem to have the noisiest exhausts despite having different systems, maybe it is because of the body shapes

That would be because there's little to insulate you from the rear doors. On a saloon, the boot area (where the exhaust will echo) is closed off by the back seat - just drive around with the back seat down and you'll notice the difference!

[mike.perry]

I will reword my last statement.
Travellers and vans appear to have noisier exhausts when heard from the outside.
My Series MM seemed to be quieter from the inside after fitting the extension

[chrisryder]

Oh, right. I can understand vans (and pickups) sounding different, as their system is shorter in overall length, but travellers... no, you've lost me! Their exhausts are identical to the saloons!

[mike.perry]

I know that travellers have the same exhaust as saloons but for some reason they have more of a rasp. Can't check on my traveller as I have an LCB two box silencer system. I would be interested to hear what it sounds like with the back box swapped for a normal tail section

[bmcecosse]

Probably just the noise reflecting off the flat rear doors of the Trav.

[MarkyB]

And the shape of the traveller rear bumper, it makes a very effective noise reflector if the exhaust finishes before it.
I improved matters on my friends traveller by fitting a tailpipe extension to move it outboard past the bumper.

[green123]

how do I sort the problem out I heard to put paraffin down the exhaust of the car and set fire to it many thanks

[Dean]

If the exhaust isn't blowing, save your money and keep as is. The rasp isn't critical and I wouldn't recommend setting fire to anything. No going back if you can't put it out.

[lambrettalad]

OMG NO! Why risk your motor by setting it on fire

[MarkyB]

Daft idea.
Have you checked the carb piston yet?
Is everything standard or do you have a pancake air filter or some such fitted?

[mike.perry]

Burning parafin mixed with petrol fumes - interesting

[green123]

obviously I would of took the exhaust of the car but some one told me if you set fire to the exhaust of the car with paraffin in gets rid of all the carbon in the exhaust.