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New for 2001

When BMW designs a new engine, it is news. After all, almost anyone can design a car, but what will they use to power it?

The new 3.0 liter straight-six engine, designated as the M54, is the latest design from BMW engineers, replacing the M52 engine.

The new power unit was featured for the first time in the 2001 models including the X5, the 3 Series Coupe, Sedan, Touring, Convertible, Z3 Roadster, and Z3 Coupe.

Click here for a history of BMW Six Cylinder engines.

Here are the details on what make this engine so special:

Question

In an era of V-6 designs, why a straight-six?
  • The laws of physics; a straight-six power unit offers the optimum physical configuration for a six-cylinder engine. 
  • The near perfect inner balance of the straight-six means an absence of free mass forces.
  • The straight-six does not require balance shafts and elaborate engine mounts to overcome the inherent vibrations of other designs.
  • With valve drive systems becoming more complex, there are engineering advantages in having only one cylinder head and only one valve train.

Design

The Design of the Straight-Six

More power, more fuel economy. Here's how:

The M54 has an aluminum crankcase with cast cylinder liners. The engine size has been increased from the 2.8 liters of the M52 model to 3.0 liters by increasing the cylinder stroke from 84.0 to 89.6 mm. With the increase in engine size, engine power has been increased from 142 kW/193 hp to 170 kW/231 hp. The increase in the opening period of the intake valves resulted in an increase of 3.5 kW/4.8 hp in engine output. The intake and exhaust manifolds have been streamlined. This improvement contributed 16 kW/22 hp to the increase in engine output. Other refinements result from reducing piston friction and cutting back the engine's idle speed.

Butterfly

Electronic Throttle Butterfly

The throttle butterfly has now been replaced by a fully electronic version.

The system recognizes the gear in which the car is driving and is thus able to activate an individually programmed throttle butterfly control line for each gear. Cruise control has been integrated within the electronic throttle butterfly. Since there are no conventional mechanical linkage bars, there is a reduction of gas pedal forces. The phrase "step on the gas" takes on a whole new meaning! The controls stored within the engine management system have increased to over 600 different operating modes.

Reliable

Engine Reliability

The M54 is the most reliable BMW engine ever built. Here's why:

  • The camshaft chain drive and the V-belt drive are maintenance-free and designed for the life of the engine.
  • Valve clearances are kept consistent throughout the entire running life of the engine by a self-adjusting hydraulic valve clearance mechanism. There is no need to adjust valve clearances, ever.
  • There is no need to reset the clutch since it is self-adjusting.
  • The air filters and spark plugs only have to be replaced after 100,000 km or 62,000 miles.
  • The oil in the transmission and final drive is a lifetime filling not requiring any replacement.
  • There is no need for any particular running-in service.
  • The BMW Service Interval Indicator informs the driver of the remaining distance until the next oil change. You no longer have to change the oil after a fixed, rigid mileage. 
  • The engine is able to adjust automatically to all fuel grades between 87 and 98 octane.
  • Anti-knock control automatically adjusts the engine's running conditions to the respective fuel grade and quality. 
  • Please note that the engine's maximum output is only achieved when running on 98 octane premium fuel.
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Specs

Specifications
  • Configuration - Straight-six

  • Market launch Year 2000

  • Max output kW/bhp 170 / 231 at 5900 rpm

  • Max torque Nm(lb-ft) 300 (221) from 3500-4750 rpm

  • Combustion process - Intake manifold injection / throttle control / lambda = 1.0

  • Capacity, effective cc 2979.3

  • Compression ratio - 10.2

  • Bore / stroke mm 84 / 89.6

  • Crankcase material - Aluminum (AISi9Cu3) with cylinder liners

  • Height of cylinder block mm 211.0

  • Distance between cylinders mm 91

  • Topland mm 7

  • Main bearing diameter mm 60.0

  • Conrod bearing diameter mm 45.0

  • Conrod length mm 135, crack technology

  • Cylinder head material - Aluminum ((AISi6CU4)

  • Camshafts - 2 chain-driven camshafts running in 7 bearings and with ultra-fine balance

  • Camshaft adjustment - Hydraulically infinitely variable phase adjustment of the intake and outlet camshafts

  • Valve drive Cup tappets with hydraulic valve play compensation

  • Valve diameter intake/outlet mm 33.0 / 30.5

  • Valve shaft diameter intake/outlet 6.0 / 6.0

  • Valve angle intake/outlet 20 o 15' / 19 o 15'

  • Max valve lift, intake mm 9.7

  • Max valve lift, outlet mm 9.0

  • Opening period, intake o CS 240

  • Opening period, outlet o CS 244

  • Intake angle range o CS 86 - 126, infinitely variable

  • Outlet angle range o CS 80 - 105, infinitely variable

  • Intake manifold - Two-chamber resonance intake system with additional turbulence unit

  • Engine weight according to BMW standard kg / lb 170 / 375

  • Engine management / fuel supply - Siemens MS43 / sequential multipoint injection / fully electronic throttle butterfly adjustment / additional turbulence system adjuster

  • Fuel grade RON 87 - 98 (rated output with 98 ROM fuel)

  • Certified emission standard - EU 4 / ULEV

  • Exhaust system - Shell manifold with three-way main catalysts close to the engine; additional secondary air injection in some markets

 

Links

Links

Performance Parts for your BMW M54 engine.

Repair Tips to keep your BMW M54 in top shape.

BMW engine and model codes.

Engine Technology:

Engine Cleaning. Be careful with your BMW M54 engine.

Wallpaper of BMW engines. More...

More engine links.



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