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Hi experts,

I recently had the oil cooler lines replaced with RB's set and I'm hearing a whining sound from the engine bay after getting the car back.

It sounds like a supercharger whine and it changes pitch with engine RPM (confirmed by revving in neutral). I visually inspected the wheels and they seem to be spinning fine. A/C is also running fine.

I suspect it's something with the belts but I'm not that savvy enough to be sure. I'll be bringing it back to the garage to have it fixed but I'm just curious and wondering if it's something easy I could adjust/fix on my own without taking time off work for it.

Thanks.

paimon.soror

iTrader: (15)

bit more information about the whole process to be able to point you in the right direction. How was the install done? Was the engine pulled to replace the lines, or done on a lift? Oil pressure values after the replacement?

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Unfortunately, I don't know the details. The install was done by a private mechanic. I know the engine wasn't pulled for this job, though.

paimon.soror

iTrader: (15)

curious, but did you ask the mechanic to diagnose

VOODOO8

Two wild *** guesses:
1) Something was moved during install of the new hoses and is now coming into very light contact with an RPM sensitive moving part on the engine (like a belt).
2) go with your initial guess about a belt, although it is not absolutely necessary to mess with the belts when installing new oil cooler lines.

Really WAG, there is a small constriction somewhere in the new lines or fittings creating some turbulence which sounds like a whine. Reason this is classed as a real WAG is because it is unlikely there is a 100% direct correlation between RPM's and the rate that oil is moving through the lines (expect that is a more general relationship).

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Thanks for the ideas so far. I had the mechanic look at it this morning but he couldn't figure out where the noise is coming from. He had loosened up the belt a bit but that didn't seem to help.

He couldn't hear it and therefore can't really tell where to look at next. The volume of the whine does get slightly softer as the car warms up. So I'll have to find a time to leave it there overnight to have him try to diagnose it when it's cold.

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Here's a video of the cold start in the morning: http://www.youtube.com/watch?v=HO2u3i_FqLY
I stepped on the clutch pedal before revving it up to remove the throwout bearing noise from the mix. If anyone has heard of it before, please let me know what that sound is.