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

  1. Veradian

    Veradian Member

    Joined:
    Feb 10, 2019
    Posts:
    9
    Thanked:
    3
    Location:
    Michigan
    First Name:
    Coleman
    Car(s):
    2018 Civic Si Sedan
    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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