Si Constant humming/"grinding" at idle, goes away with clutch fully pressed

Veradian

Member
First Name
Coleman
Joined
Feb 10, 2019
Threads
3
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Location
Michigan
Vehicle(s)
2018 Civic Si Sedan
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Hey all,

So this is my first post, figured I'd ask here and see what you guys think. To start,I have a 18' Si with an FX350 + aluminum flywheel, 27Won RMM, PRL DP, and full acuity shifter. Car has 21k miles and the clutch has 15k miles. Like the title says, there's a constant humming at idle that goes away when I press the clutch all the way in. I'm hard pressed to describe the sound as grinding because that just doesn't fit the sound. It's almost like a "shhhh" noise. I've had several people tell me it's likely the throw out bearing, but my worry is that it's something like the input shaft bearing.

The car seems to drive like it always had. Clutch feels about the same stiffness as when I finished breaking it in, gear shifts are the standard 10th gen Si mechanical feeling. If you have any input, advice, questions I'd greatly appreciate it. :)
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