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    Journal Bearing vs. Ball Bearing Turbos

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    Rick Ears

    Posts : 145
    Join date : 2009-02-25

    Journal Bearing vs. Ball Bearing Turbos

    Post  Rick Ears on Sun Mar 01, 2009 4:02 pm

    The journal bearing has long been the brawn of the turbocharger,
    however a ball-bearing cartridge is now an affordable technology
    advancement that provides significant performance improvements to the
    turbocharger.

    Ball bearing innovation began as a result of work with the Garrett
    Motorsports group for several racing series where it received the term
    the ‘cartridge ball bearing’. The cartridge is a single sleeve system
    that contains a set of angular contact ball bearings on either end,
    whereas the traditional bearing system contains a set of journal
    bearings and a thrust bearing

    Turbo Response – When driving a vehicle with the cartridge ball
    bearing turbocharger, you will find exceptionally crisp and strong
    throttle response. Garrett Ball Bearing turbochargers spool up 15%
    faster than traditional journal bearings. This produces an improved
    response that can be converted to quicker 0-60 mph speed. In fact, some
    professional drivers of Garrett ball-bearing turbocharged engines
    report that they feel like they are driving a big, normally aspirated
    engine.
    Tests run on CART turbos
    have shown that ball-bearings have up to half of the power consumption
    of traditional bearings. The result is faster time to boost which
    translates into better drivability and acceleration.
    Reduced Oil Flow – The ball bearing design reduces the required
    amount of oil required to provide adequate lubrication. This lower oil
    volume reduces the chance for seal leakage. Also, the ball bearing is
    more tolerant of marginal lube conditions, and diminishes the
    possibility of turbocharger failure on engine shut down.
    Improved
    Rotordynamics and Durability – The ball bearing cartridge gives better
    damping and control over shaft motion, allowing enhanced reliability
    for both everyday and extreme driving conditions. In addition, the
    opposed angular contact bearing cartridge eliminates the need for the
    thrust bearing commonly a weak link in the turbo bearing system.
    Competitor
    Ball Bearing Options – Another option one will find is a hybrid ball
    bearing. This consists of replacing only the compressor side journal
    bearing with a single angular contact ball bearing. Since the single
    bearing can only take thrust in one direction, a thrust bearing is
    still necessary and drag in the turbine side journal bearing is
    unchanged. With the Garrett ball bearing cartridge the rotor-group is
    entirely supported by the ball bearings, maximizing efficiency,
    performance, and durability.
    Ball
    Bearings in Original Equipment – Pumping up the MAZDASPEED Protegé’s
    heart rate is a Garrett T25 turbocharger system. With Garrett
    technology on board, the vehicle gains increased acceleration without
    sacrificing overall efficiency and it has received many rave reviews
    from the world’s top automotive press for it’s unprecedented
    performance.
    avatar
    Rollinx25

    Posts : 4
    Join date : 2009-03-24
    Age : 38
    Location : Oklahoma, OKC

    Re: Journal Bearing vs. Ball Bearing Turbos

    Post  Rollinx25 on Wed Mar 25, 2009 4:34 pm

    Damm... thats a pretty good write up or the different types of turbo's.

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