engine noise

J

johnuk

New Member
1968, 2000 sc auto.

I have had this car for many years, it has a "drooning", sort of inbalanced noise that comes in at 60 mph and levels out at 80 mph. I changed the engine and gear box many years ago for a 1976 2200 sc auto unit. This may have been when the noise started but I cant remember if the original made the noise or not. Since then I have changed all of the following parts, engine mountings, engine for a 1977 2200 tc, auto gearbox, flex drive plate, ring gear, torque convertor, diff and diff mounts, de dion tube, trailing arms and bushes, all four wheel bearings, rear springs, all four shock absorbers, balanced prop and half shafts, removed fan and belt. Is there any thing else? Please help as I am going mad, (not joking!. The car has visited many specialists including MGM motors (Carlisle), Paul Atkinson (Birmingham) and Vibration Free, (Oxford), and many hours in my own garage where the car was sold new, to name a few. As you can see many of us have tried and failed to stop this noise, so if you can suggest anything that fixes it you will get a very large feather in your cap,
Many thanks, J C Gates

P.S this topic has already been posted by myself. I am still struggling to beat this noise and wonder if anyone has any fresh ideas. It seems to be in the left hand rear (could it be a fault from the factory in the shell?)
 
I am guessing that this phenomenom is NOT going to go away with the replacement of parts and fine tuning. I suspect that the shape, weight, and contour of the vehicle along with all
its moving parts create the sound at these speeds.
All objects have a resonant frequency related to a specific wavelength.
I think you have found the one for your Rover.

Dick West
 
mine does exaclty the same, but from around 55ish up to 70ish, by the time she gets to 75 its gone and by the time, 2 days later the speedo says 90, its a quiet as a mouse!
Maybe all the 2000sc auto's do this?
Perhaps we could get dispension for having to drive at 90 :D

My car is all original, 70K miles (overhauld rear bushes but only because they were shot) I did fit extra sound deading material under the dash and it helped a bit.

Here's hoping someone has a solution ! as we all seem to suffer from it?
 
It could be the exhaust as mk1 fiestas do exactly the same between 40 and 65 mph..and that is the exhaust that makes them do it..
 
Would be easier to test with a manual gearbox as you could select a lower gear to change the rpm hence the exhaust note. Although just backing off the throttle a bit should change the exhaust note enough to tell if its that.

If your pocket can stand it, try taking it for a rolling road session and see if the noise appears whilst on the rollers, this would basically remove wind-noise as a factor, and also any front wheel noise (these wont be moving). Plus you can stand next to the car while its doing 80mph on the rollers and listen to the engine screem !
Its actually quite a scary experience the first time you do it, I was stood next to a 4x4 car doing effectively 150mph on the rollers at > 6000rpm what a noise !

Richard
 
I think it is a difficult thing to pin down without seeing the car in the flesh.

Do I understand that your car has a twin carbs and an auto box?

How does the car drive generally. I am curious have never heard of a tc auto and wondered if it would make a difference.

Colin
 
Check the rear upper valance panel for any looseness. For such a small panel they can make a lot of niose if the bolts are not tight. Somtimes they rattle, sometimes they buzz.
 
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