BMW N54 vs N55: What's the Difference?

The BMW N54 and the BMW N55 differ in compression ratio, factory rating, model years. The table puts the factory specs side by side; each engine's own page has the full specs.

Specs side by side

BMW N54BMW N55
EngineBMW N54 (twin-turbo 3.0L I6)BMW N55 (single twin-scroll turbo 3.0L I6)
Displacement181.8 ci (2.98 L)181.8 ci (2.98 L)
Bore × stroke3.307" × 3.528"3.307" × 3.528"
Cylinders66
Compression ratio9.4:1–10.2:110.2:1
Factory rating300 hp–360 hp300 hp–365 hp
Blockaluminum—
Headsaluminum—
Rod length——
Deck height——
Weight (approx.)——
Fuelgasgas
Model years2007–20162011–2019

Where versions of an engine differ, the table shows the range across them. Ratings are the makers' published figures.

Other differences

BMW N54BMW N55
Factory recall (N55-era vehicles)--NHTSA 14V-176: 2010-2012 BMW inline-six models (incl. 2011 335i, 2011-12 135i, 2011 535i, X5/X6 xDrive35i) - VANOS housing bolts can loosen and break; dealers replace bolts; extended warranty for 170,172 other 2010-2012 I6 vehicles

Which cars got each engine

BMW N54Years
BMW 3 Series / M32007–2013
BMW 1 Series2008–2011
BMW 5 Series2008–2010
BMW Z42009–2016
BMW 7 Series2011–2012
BMW N55Years
BMW 1 Series2011–2013
BMW 3 Series / M32011–2015
BMW 5 Series2011–2016
BMW X52011–2018
BMW Z42011–2016
BMW 6 Series2012–2019
BMW 7 Series2013–2015
BMW 2 Series2014–2018

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