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BMW M57 Specifications & Data

Core engine specifications for the BMW M57 diesel — bore and stroke, displacement, compression ratio, firing order and power/torque outputs per variant (306D1 to 306D4, M57D30).

Identity & configuration

Engine type: R6 / 4-valve — Engine type / valves per cylinder; original M57 in S1
Engine type: 6-cyl in-line / 4-valve — Applies to both M57D30 TU1 EURO 4 and TU1 TOP in S2

Dimensions & compression

Effective displacement: 2926 ccm — Effective displacement, original M57
Displacement: 2993 cm3 — M57D30 TU1 EURO 4 and TU1 TOP both 2993 cm3 in S2
Stroke × bore: stroke 88.0 / bore 84.0 mm — S1 prints row as Stroke/bore = 88.0/84.0 mm; do not transpose. Bore also confirmed 84.0 mm S1 p.19
Stroke × bore: stroke 90 / bore 84 mm — S2 prints Stroke/bore = 90/84; stroke rises 88.0->90 vs M57. Applies to TU1 EURO 4 and TU1 TOP
Compression ratio: 18 :1 — Compression ratio, original M57
Compression ratio: 17.0 :1 — Compression ratio for M57D30 TU1 EURO 4 (single-turbo TU1)
Compression ratio: 16.5 :1 — Compression ratio for M57D30 TU1 TOP (twin-turbo)

Performance & governing

Engine weight: 210 kg — Engine weight, original M57; not given for any TU1 variant
Power-to-weight ratio: 1.56 kg/kW — Power-to-weight ratio, original M57

Dimensions & compression

Compression pressure: 20-25 bar — Compression pressure at operating temperature; stated as common M57 feature, not carried forward to TU1 in sources
Lambda range: 1.15 <= lambda <= 4 — Air/fuel mixture lambda range; stated as common M57 feature, no TU1 equivalent in S2

Identity & configuration

Combustion system: Common rail, 4-valve with central injector; cooling-duct pistons with central crown bowl — Combustion system

Performance & governing

Governed / cut-off behaviour: cuts out from 4000 rpm, injected volume reduced continuously, cut-out limit approx. 4800 rpm rpm — Governed / cut-off speed behaviour, original M57. Presentation differs from S2 single-figure cutoff; not directly comparable
Governed cut-off speed: 4600 rpm — Governed cutoff speed, M57D30 TU1 EURO 4
Governed cut-off speed: 5000 rpm — Governed cutoff speed, M57D30 TU1 TOP

Turbo & boost

Max boost pressure: 2.85 bar — Max boost pressure, overall two-stage system, TU1 TOP
Max boost (reference): 2.5 bar — Reference: M57TU max boost, quoted in S2 for comparison
Max turbine speed — HP stage: 230000 rpm — Max turbine speed, high-pressure stage, TU1 TOP
Max turbine speed — LP stage: 170000 rpm — Max turbine speed, low-pressure stage, TU1 TOP
Turbine control valve: EPDW, PWM 300 Hz, 12 V nominal — Turbine control-valve actuation, TU1 TOP
Supercharging switch points: both stages up to 1500 rpm; transition 1500-3250 rpm; LP stage only 3250-4200 rpm; nominal-output range from 4200 rpm (wastegate opens) — Supercharging switching points at full load, TU1 TOP

Dimensions & compression

Cylinder spacing: 91 mm — Cylinder spacing, M57
Crankcase height: 225.0 (crank centre to head sealing surface) / 285.0 (overall) mm — Crankcase height, M57
Bore: 84.0 mm — Bore, M57

Valvetrain

Valve diameter: 25.9 mm — Valve diameter, M57
Valve seat angle: 45 degrees — Valve seat angle, M57
Valve stem diameter: 6 mm — Valve stem diameter, M57
Valve V-angle (inlet): 3.75 degrees — Valve V-angle, inlet, M57
Valve V-angle (exhaust): 3.0 degrees — Valve V-angle, exhaust, M57

Crankshaft & con-rods

Con-rod centre distance: 135 mm — Con-rod distance between hole centres, M57
Gudgeon pin diameter: 30.0 mm — Piston (gudgeon) pin diameter, M57
Con-rod big-end bore: 48 mm — Cracked con-rod (big-end) dimension, M57

Valvetrain

Negative cam radius: 67 mm — Negative cam radius, M57

Fluids, cooling & service

Oil pump delivery: 85 l/min — Oil pump delivery capacity, M57
Oil-pump relief pressure: 4.2 -0.2 bar — Oil-pump cutout-valve opening pressure, M57
Thermostat opening temp: 88 degC — Thermostat opening temperature, M57

Electrical & mounts

Starter rated output: 2.2 kW — Starter rated output, M57
Starter rated voltage: 12 V — Starter rated voltage, M57
Starter test voltage: 13 -0.26 V — Starter test voltage, M57

Crankshaft & con-rods

Vibration-damper bolt torque: 45 Nm — Torsional-vibration-damper mounting torque, M57

Electrical & mounts

Engine-mount spring rate: left 180 / right 220 N/mm — Engine-mount spring rate (M57 pin/pin)
Engine-mount switch — engine rpm: 900 (+/-50 hysteresis) rpm — Engine-mount switching: engine speed, M57
Engine-mount switch — road speed: 60 (+/-5 hysteresis) km/h — Engine-mount switching: vehicle speed, M57
Alternator output: 95 A basic / 140 A special A — Alternator, M57

Fluids, cooling & service

Coolant capacity: approx. 9.2 litre — Coolant fill volume, M57 E38/E39
Coolant change interval: every 4 years — Coolant change interval, M57
Inspection interval: 20000 up to max. 25000 km, limited to 2 years km — Average inspection interval, M57

Identity & configuration

Head-gasket selection: Multi-layer steel gasket, 3 thicknesses by piston clearance x: x<=0.92 mm = 1-hole; 0.92<x<=1.03 mm = 2-hole; 1.03<x = 3-hole mm — Cylinder-head-gasket selection table, M57

Performance & governing

Rev limit (under load): 4800 rpm — Rev cut-off raised under load (4000→4800 rpm).

Crankshaft & con-rods

Connecting-rod length: 136 mm — Lengthened from 135 mm (M57); thicker stem for higher ignition pressure (common part with M47TU).

Dimensions & compression

Crankshaft stroke: 90 mm — Extended from 88 mm (M57) to 90 mm (M57TU) — the displacement rise came from stroke.

Performance & governing

Governed (cut-off) speed: 4600 rpm — M57D30 TU1 EURO 4 (single-turbo, 218 PS).
Governed (cut-off) speed: 5000 rpm — M57D30 TU1-TOP two-stage twin-turbo (272 PS).
Peak torque plateau: 560 Nm @ 2000–2250 rpm (500 Nm from 1500 rpm) — Two-stage supercharging gives a broad, early torque plateau.
Peak torque plateau: 500 Nm @ 2000–2750 rpm — M57D30 TU1 EURO 4 single-turbo.