BMW N55 - Valve Timing

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N55 Engine
Valve Timing
N55 valve timing diagram
Note: The N55 has a larger intake and exhaust VANOS adjustment range
as well as larger intake valve lift, and cam duration than the N54 engine.
N54B30O0 N55B30M0
Intake valve Ø
[mm] 31.4 32
Exhaust valve Ø
[mm] 28 28
Maximum valve lift, intake
valve/exhaust valve
[mm] 9.7/9.7 9.9/9.7
Intake camshaft spread (VANOS
adjustment range)
[°crankshaft] 55 70
Exhaust camshaft spread (VANOS
adjustment range)
[°crankshaft] 45 55
Intake camshaft opening angle
(max.-min. spread)
[°crankshaft] 125 - 70 120 - 50
Exhaust camshaft opening angle
(max.-min. spread)
[°crankshaft] 130 - 85 115 - 60
Opening period intake camshaft
[°crankshaft] 245 255
Opening period exhaust camshaft
[°crankshaft] 261 261