Harmonic Balancer
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This is a discussion on Harmonic Balancer within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; The crank pulley/harmonic balancer on my 03 wrx seems to be done for. The OE part is 8 but I ...

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    Registered User subcon's Avatar
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    Harmonic Balancer

    The crank pulley/harmonic balancer on my 03 wrx seems to be done for. The OE part is $288 but I have found lightweight crank pulleys from perrin and cobb for less than half the price. I am trying to catch myself up to speed on how the harmonic balancer works exactly (I know their purpose, just not how they physically work) and am curious what problems could come from simply bolting on a lightened crank pulley on a daily driven car. Any input is helpful. Thanks.

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    He simply abides. SD_GR's Avatar
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    Follow the link, but how do you know there is a problem with your existing pulley, and what caused that problem?
    Pulley FAQ: Read if you are thinking of buying one! - NASIOC
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    UnBanned Sinister's Avatar
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    Quote Originally Posted by subcon View Post
    The crank pulley/harmonic balancer on my 03 wrx seems to be done for. The OE part is $288 but I have found lightweight crank pulleys from perrin and cobb for less than half the price. I am trying to catch myself up to speed on how the harmonic balancer works exactly (I know their purpose, just not how they physically work) and am curious what problems could come from simply bolting on a lightened crank pulley on a daily driven car. Any input is helpful. Thanks.
    Luckily for you, the WRX does not have or need a harmonic balancer. The Crank Pulley is not a harmonic balancer. There are quite a few threads on here explaining that, including the one that Dan (SDGR) just gave you.

    If you don't have a lightweight flywheel, then a lightweight pulley from cobb, or perrin would be a great addition. It'll reduce gas mileage, reduce rotational inertia on the crank, which allows for a quicker acceleration of the engine!
    Kevin
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    Registered User subcon's Avatar
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    After a trip on a trailer to the shop I work in, and about 30 minutes worth of turning wrenches have determined that the crank pulley is fine but long story short, spun a bearing, metal shavings, ruined crankshaft. Bottom end rebuild is starting tomorrow. Thanks anyway for the speedy responses.

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    UnBanned Sinister's Avatar
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    Quote Originally Posted by subcon View Post
    After a trip on a trailer to the shop I work in, and about 30 minutes worth of turning wrenches have determined that the crank pulley is fine but long story short, spun a bearing, metal shavings, ruined crankshaft. Bottom end rebuild is starting tomorrow. Thanks anyway for the speedy responses.
    If you have to rebuild... get forged pistons
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

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