Hopefully i can help..
Which side roughly as far as you can tell does this noise come from on the engine?
Does it change pitch at any point when revving the engine etc?
I asume this noise happens too when the cars stationary and the engine idling?
What sort of mileage does it have and work and service history?
while driving the knocking gets louder but when you slow down there is m,ore wirring.sounds like something going round .its done 123000.noise doesnt happen nwhile stationary.the wirring changes pitch.when you change gear its easy but you cant rev to much between gears as it seems to be harder to change gear if it revs to much .hope this makes sense
Hi..there thanks for getting back..
Ok..So its more of actual driving issue this noise is heard - well without hearing it - i can say the engine is most likely ruled out anyway as far as your description goes - if it was still heard even if the car was stationary for example coming to lights etc then you could be looking at something maybe driven off the belt side for example..However as you say the gears are becoming difficult to change - so the issue could well be a drivetrain issue as far as the transmission is concerned or the clutch assembly bearing/ pressure plate even..might also be worth inspecting the shift linkages as per from the gearstick to transmission for any obvious wear etc..other areas to maybe check off would be for transmission/engine mount issues for any wear aswell as any issues in regards XXXXX XXXXX driveshafts too.but as above if there is gear selection trouble with the whirring as you describe then it may well be clutch assembly related..only way to listen for sure is to get the car up in the air "usually on 2 post lift" - put it in gear and listen carefully around the transmission/bellhousing to see if the noise can be pin pointed to one or the other and might help narrow it down.I do hope this helps