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    BMW N55 Engine Overview

    bimmer-merch.com/blogs/articles/bmw-n55-engine-overview-everything-you-need-to-know

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    General Characteristics
    • 2009 turbocharged 3.0L inline-six engine replacing N54
    • Features single twin-scroll turbocharger instead of dual
    • Uses cast iron crankshaft and rods instead of forged ones
    • Includes VANOS variable valve timing system with 15° intake and 10° exhaust adjustment
    Engine Versions
    • N55B30M0 produces 302hp at 5,700-5,800rpm
    • N55B30 delivers 315hp at 4,505-6,000rpm
    • N55B3000 produces 322hp between 4,505-6,000rpm
    • N55HP delivers 335hp from 4,505-6,000rpm
    • N55B30T0 produces 365hp at 6,500rpm
    Common Issues
    • Valve cover oil leaks can occur due to high temperatures
    • VANOS solenoid failure affects engine performance
    • Water pump failure is common across BMW models
    • Oil filter housing gasket leaks can damage engine components
    • High pressure fuel pump issues affect early 2010-2011 models
    Reliability
    • Generally considered BMW's most dependable turbocharged engine
    • Can be tuned to produce up to 400whp
    • Reliability depends on maintenance and vehicle condition
    • Repair costs can increase with frequent service

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