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I own a 2008 Euro Civic Type-R which has almost the same engine as the US Civic Si (K20Z3 vs K20Z4).

Since a bit of time I have a really annoying high pitched noise coming from the engine. It's constantly present, completely tied to revs, and persists when clutch is disengaged (so it's not coming from the gearbox). It sounds a bit like an electric motor from a radio-controlled toy car.

About six months ago (maybe a year) the sound could not be heard inside the cabin when cruising unless windows were open, but started being heard when opening the windows, especially in an underground parking lot. I brought it to the dealer who said it was normal engine noise, and that "fixing" it would require a new engine (quotes meaning that it was, to him, not requiring being fixed).

The sound is stronger now as I can hear it in the cabin when cruising with windows closed, to the point of being distractive, if not painful on long journeys, so I don't really buy it that this is normal.

THe car is completely stock. I'm running on 0w40 oil, am regularly pushing the car but have always respected warm up time, and since I bought the car new, did (to the best of my knowledge) proper break-in. FWIW the K20 engine has a chain transmission and an accessory belt.

Here is a video recording where I rev at a standstill, with clutch disengaged (watch in 720p HD for clearer sound).

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I would go to the dealer and ask if they have a similar 2008 you can test drive or at least start and rev to see if it makes the same noise. –  mikes May 20 '12 at 10:37

2 Answers 2

Have you checked the Power steering pump/fluid level? I own a 2003 stream and heard a slightly heavier whining noise similarly tied to engine speed. You could try turning the steering end to end while engine is idling and listen. In my case it turned out to be a defective power steering hose.

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Can you hear where in the engine it's coming from or at least what area? Since the noise is tied to engine revs, I'd suggest checking anything that increases with increased RPMs. Power steering pump/fluid levels, timing belt/chain, tensioners, AC compressor, alternator, etc.

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