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The Cooper S engine from that era is not quiet by any measure. My car, for example is sensitive to oil level. It is noticeably smoother and quieter with the oil topped off than if it is even a little low on the dipstick. So I would make sure the oil level is good to rule out the valvetrain.
Hopefully, its not something like the waterpump, which is driven off the supercharger.
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Paul
82 911SC - 3 yrs of fun (traded-in)
2011 Cayman (simply amazing, smiles for miles)
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