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    Wastegates

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    Rick Ears

    Posts : 145
    Join date : 2009-02-25

    Wastegates

    Post  Rick Ears on Sun Mar 01, 2009 4:00 pm

    On the exhaust side, a Wastegates provides us a means to control the
    boost pressure of the engine. Some commercial diesel applications do
    not use a Wastegates at all. This type of system is called a
    free-floating turbocharger.
    However,
    the vast majority of gasoline performance applications require a
    Wastegates. There are two (2) configurations of Wastegates, internal or external.
    Both internal and external Wastegates provide a means to bypass exhaust
    flow from the turbine wheel. Bypassing this energy (e.g. exhaust flow)
    reduces the power driving the turbine wheel to match the power required
    for a given boost level. Similar to the BOV, the Wastegates uses boost
    pressure and spring force to regulate the flow bypassing the turbine.
    Internal Wastegates are built into the turbine housing
    and consist of a “flapper” valve, crank arm, rod end, and pneumatic
    actuator. It is important to connect this actuator only to boost
    pressure; i.e. it is not designed to handle vacuum and as such should
    not be referenced to an intake manifold.
    External Wastegates are added to the exhaust plumbing
    on the exhaust manifold or header. The advantage of external Wastegates
    is that the bypassed flow can be reintroduced into the exhaust stream
    further downstream of the turbine. This tends to
    improve the
    turbine’s performance. On racing applications, this Wastegated exhaust
    flow can be vented directly to atmosphere.

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