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Thread: sounds like a slight rod knock

  1. #26
    Join Date
    Jul 2005
    Location
    California
    Posts
    758
    My Cars
    Bima
    let me tell you a story.

    After rebuilding my block.
    it started up smoooooth. fkn super smooth. sounded awesome.
    I got the cam broken in. Everything was perfect by the book. then it started to knock.

    it would now only knock when it warmed up.
    The knock would go away if i kept it in a no load cruising situation, but decel.... on decel it would clack clack clack clack HARD.

    Took that big ass beast out and looked inside
    it actually turned out one of the clips that hold the rod pin was missing!
    #6 had a massive scratch running up the cyl wall from the pin and the hole was wallowed out.
    the bearings on it also had some accelerated wear. so...

  2. #27
    Join Date
    Oct 2016
    Location
    San Leandro
    Posts
    43
    My Cars
    2008 535i, 2004 328i
    Any chance of detonation? Mine was caused by detonation, it rattled the spring clip right out.

  3. #28
    Join Date
    Jun 2001
    Location
    hell
    Posts
    1,568
    My Cars
    turbo e36 m3/ stock s50/e30 m3
    Quote Originally Posted by Robocop View Post
    let me tell you a story.

    After rebuilding my block.
    it started up smoooooth. fkn super smooth. sounded awesome.
    I got the cam broken in. Everything was perfect by the book. then it started to knock.

    it would now only knock when it warmed up.
    The knock would go away if i kept it in a no load cruising situation, but decel.... on decel it would clack clack clack clack HARD.

    Took that big ass beast out and looked inside
    it actually turned out one of the clips that hold the rod pin was missing!
    #6 had a massive scratch running up the cyl wall from the pin and the hole was wallowed out.
    the bearings on it also had some accelerated wear. so...
    thats my next step to check those pins


    96 M3, GT4094R, Arrow Rods, CP Pistons, Elring HG, cutring 87mm, 10 mm ARP studs,MS3pro, EMC Intercooler, n54 6 speed with Motiv twin disk, ZT-2 wideband, Zionsville Radiator, X-brace, H&R springs with bilstien shocks, QTP electronic cutout, Line Locks, stock exhaust 455rwtq, 453rwhp at 14 psi 91 octane.......684rwtq, 681rwhp at 24 psi running flex fuel E60 at time of dyno tune.

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