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What causes bottom end noise

Discussion in 'Engine Building' started by Canuck 93 Civic Si, Jul 11, 2003.

  1. Canuck 93 Civic Si

    Canuck 93 Civic Si Senior Member

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    I started getting some bottom end noise a little while ago and decided to pull the mains to measure them.

    This is what i found...

    [​IMG]
    :eek:
    [​IMG]

    [​IMG]

    Im actually kinda suprised they didnt make more noise. I think that the owner before me overheated the engine and cooked a few of the bearings, what do you guys think?
     
  2. B16

    B16 Super Moderator VIP

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    what does this bottom end noise sound like? and at what rpms?
     
  3. Canuck 93 Civic Si

    Canuck 93 Civic Si Senior Member

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    You can hear this noise at any rpm, it gets louder as you start to load up the engine. Basicly what you are hearing is a knock that is made when the crank shaft is banging around in the main bearings because they are too loose or its the rod bearings banging around the crank journal because they are too loose. Either way its just a knocking sound
     
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