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Q & A: Drumming Noise at Cruising Speed

John :
What do you know about the drumming noise (vibration?) that gets set up at 70-ish MPH an an MGB GT?
It is at a practically legal cruising speed and I would like to loose it, any ideas?
Hope all is well with you
TTFN John

John : Thanx for your suggestion (Interesting that many other people were copied on the reply - do they have a drumming in their ears at 70 MPH too ?)

1. Exhaust : I have already had it replaced 2 years ago to a standard muffler/silencer and noise did diminish somewhat. Maybe it has not got rid of it completely and some engine/exhaust harmonics (more like cacophonics) still exist. I will try out your rev. test standing still.

2. Tyres (notice correct spelling ! ...Cheeky) : This is worth looking at again though I did have all 4 balanced (on the car) a little while back, this is not to say that it was done perfectly - there may still be vibration generated - I have another set of wheels I can use that are on my 79 LE which dont create a noise. I will swap them and hear what happens.

NB Whole back end was changed a few years ago ( the diff. went ) which made very little difference, I thing it changed the pitch.
If you think that it is possible that there is something in the GT design that may cause this in some cars would you let me know ?

I don't know how long it will take me to get rid of the noise, but I will keep you posted on the results of your well appreciated suggestions.

John!

Some noises are set up by harmonics from the engine and exhaust, some by the rotation of the tires. Sit in your driveway and rev the engine to 3500-4000 and see if you can duplicate the noise. If you can, then the problem i... read more