Langy

As i hit 100mph on my UK MY97 (private road, of course ) there is a rumbling coming from the car, it is quite loud and doesn't get any better as you go faster. It's always 100mph it happens at, i would describe it as a wheel bearing but why only above 100??

Could it be anything else?

And if it's a wheel bearing how do i know which one it is?

2fuknfast4U

try getting your wheels balanced!!?

Marky-San

I think if you get the wheel off the ground and spin it you can hear the grumble - you should hear it at most speeds though.

Langy

Nope, only seems to be after 100moh, never hear it any other time. Hard to work out cos of the speeds concerned but as you can imagine, fairly annoying quite a lot of the time

nom

Err, this private road - is it always the same one? Some roads just make a rumbling noise above a certain speed.
Just a thought!

silver-sub

couldn't agree with you more nom, was paranoid myself until i took it on some nice clean motorway

Gedi

Could be due to resonance. Its an engineering term regarding vibrations of parts crossing frequencies. Maybe somebody with a little more engineering backgrround could elaborate.......or toss my theory in the bin

hades

If it comes at 100mph and is still there at 110mph, then it's bin time, I'm afraid Resonance is normally fairly well tuned to a certain frequency (or in this case speed). If it is gone by 105mph, something is probably resonating. I won't elaborate though!

As an example, a common thing on some cars is to discover a resonant vibration at about 80mph due to wheel balance being out. At 70 and 90, the vibration will be there but much less bad.

Langy

Thanks for the input guys
Again, tested it on 'the private road' again last night and it rumbles from just over 100 to... well, you can imagine

Could it possibly be tracking?

It defo ain't resonance though

TonyBurns

iTrader: (3)

Are you sure its just not tyre noise?
Some road surfaces are designed to "rumble" at higher speeds so you know your going fast

Tony

ozzy

Langy,

I don't get any rumbling going past Strathy Park (at any speed ). If it was wheel balance, you'd feel the vibration right through the steering wheel.

You get loads of rumbling on the M74 heading south, but that's just the **** road surface

Stefan

Vanker

Resonnance is actual the natural frequency of an object. Crossing frequencies would be reverberation.

hades

No - resonance is actually where the amplitude of a wave or vibration increases in amplitude, caused when the excitation matches the resonant (or natural) frequency of the object, if we want to get technical.