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The N51 engine is a SULEV version of the N52 that was sold in parts of the United States that had SULEV legislation. [25] Differences to the N52 versions include a variable-length intake manifold ("DISA") with three stages instead of one, and a compression ratio lowered from 10.7:1 to 10.0:1. [26]
Other upgrades included a new design throttle body with the ASC (traction control) motor built in and throttle cable override, revised coolant passages with an additional drain back passage and a new cooling system with push fit hoses and a separate expansion tank plus [5] a dual length intake manifold (called "DISA") and steel cylinder liners ...
BMW — DISA (DIfferenzierte SaugAnlage – "Differential Air Intake"), two stage: M42, M44, M54, N62TU, three stage: N52; DIVA (continuously variable length runners): N62, is the world's first continuously variable length intake manifold. [2] Citroën — XM 3,0 V6.24 (200 hp) used during 1991 to 1997, ZX Coupe 2.0 16v XU10J4 engine.
The BMW M54 is a naturally aspirated straight-6 DOHC petrol engine produced from 2000 to 2006. It was released in the E53 X5 [1] and is the replacement for the M52 engine. The S54 is the equivalent high performance engine, used in the E46 M3, the Z3 M Coupé/Roadster and the E85/E86 Z4 M.
The exhaust manifold design, called Cylinder-bank Comprehensive Manifold (CCM) by BMW, aims to reduce the pressure fluctuations to reduce throttle lag and exhaust back-pressure. [8] The twin-scroll turbocharger uses 2 sets of exhaust duct to turn 1 turbine wheel, with cylinders 1–3 and 4–6. [9]
The intake manifold vacuum, with wide open throttle, is lower in these conditions, which causes the PCV valve to open and the crankcase gases flow to the intake system. [13] The greater flow rate of intake air during these conditions means that a greater quantity of blow-by gases can be added to the intake system without compromising the ...
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