m54 engine - BMWClub.lv

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RESONANCE/TURBULENCE INTAKE SYSTEMOn the M54, the intake manifold is split into 2 groups of 3 (runners) which increases lowend torque. The intake manifold also has separate (internal) turbulence bores which channelsair from the idle speed actuator directly to one intake valve of each cylinder (matchingbore of 5.5mm in the cylinder head).Routing the intake air to only one intake valve causes the intake to swirl in the cylinder.Together with the high flow rate of the intake air due to the small intake cross sections, thisresults in a reduction in fluctuations and more stable combustion.MAIN MAINIFOLDRAM TUBERESONANCE TUBEMS42.0MS 43.0MAGNETICVALVEVACUUMUNITMDKEDKHFMIDLE AIR CONTROL VALVE(ZWD)RESONANCE MANIFOLDTURBULENCE MANIFOLDTURBULENCE BORE 0:5.5mmCRANKCASE VENTILATION____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________42M54engMS43/ST039/3/17/00
RESONANCE SYSTEMThe resonance system provides increased engine torque at low RPM, as well as additionalpower at high RPM. Both of these features are obtained by using a resonance flap (inthe intake manifold) controlled by the ECM.During the low to mid range rpm, the resonance flap is closed. This produces a long/singleintake tube for velocity, which increases engine torque.During mid range to high rpm, the resonance flap is open. This allows the intake air to pullthrough both resonance tubes, providing the air volume necessary for additional power atthe upper RPM range.When the flap is closed , this creates another “dynamic” effect. For example, as the intakeair is flowing into cylinder #1, the intake valves will close. This creates a “roadblock” for thein rushing air. The air flow will stop and expand back (resonance wave back pulse) with thein rushing air to cylinder #5. The resonance “wave”, along with the intake velocity,enhances cylinder filling.The ECM controls a solenoid valve for resonance flap activation. At speeds below 3750RPM, the solenoid valve is energized and vacuum supplied from an accumulator closesthe resonance flap. This channels the intake air through one resonance tube, but increasesthe intake velocity.When the engine speed is greater than 4100 RPM (which varies slightly - temperature influenced),the solenoid is de-energized. The resonance flap is sprung open, allowing flowthrough both resonance tubes, increasing volume.43M54engMS43/ST039/3/17/00
Page 1: Table of ContentsSubjectPageM54 Eng
Page 4 and 5: M54 ENGINEMechanical ChangesIn addi
Page 6 and 7: M54B30 ENGINE293225ART-HPCHARTB30.6
Page 8 and 9: REVIEW QUESTIONS1. What is the majo
Page 10 and 11: SYSTEM OVERVIEW I-P-OServiceEngineS
Page 12 and 13: MS 43 NEW FUNCTIONSACCELERATOR PEDA
Page 14 and 15: MS 43 NEW FUNCTIONSEDK THROTTLE POS
Page 16 and 17: MS 43 NEW FUNCTIONSMAIN RELAY MONIT
Page 18 and 19: MS 43 NEW FUNCTIONSDM-TL (DIAGNOSIS
Page 20 and 21: DM-TL (DIAGNOSIS MODULE - TANK LEAK
Page 22 and 23: LEAK DIAGNOSIS TESTPHASE 1 - REFERE
Page 24 and 25: TEST RESULTSThe time duration varie
Page 26 and 27: OXYGEN SENSOR SIGNAL INFLUENCE ON I
Page 28 and 29: CRANKSHAFT SENSORThe crankshaft sen
Page 30 and 31: EMISSIONS RELEVANT:During an interv
Page 32 and 33: MASS AIR FLOW SENSOR HFMThe Siemens
Page 34 and 35: NOTE: With extremely hot oil temper
Page 36 and 37: The dual VANOS in conjunction with
Page 38 and 39: SECONDARY AIR INJECTIONThis ECM con
Page 40 and 41: ENGINE/VEHICLE SPEEDLIMITATIONFor e
Page 44 and 45: #1 Cylinder Intake Valve openLow to
Page 46 and 47: IDLE SPEED CONTROLThe ECM determine
Page 48 and 49: PURGE VALVEThe purge valve (TEV) is

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