M52TUB25

BMW M52 engine
Overview
Production	1994–2000
Combustion chamber
Configuration	Straight-6
Valvetrain	DOHC
Chronology
Predecessor	BMW M50
Successor	BMW M54

BMW S52 engine
Overview
Production	1996–2000
Combustion chamber
Configuration	Straight-6
Valvetrain	DOHC
Chronology
Predecessor	BMW S50B30US
Successor	BMW S54

The BMW M52 is a straight-6 DOHC petrol engine which was produced from 1994-2000. It was released in the E36 320i, to replace the M50.

In 1998, the "technical update" (M52TU) upgrades included adding variable valve timing to the exhaust camshaft.

The M52 was replaced by the M54 in 2000.

The 1996-1999 E36 M3 in the United States and Canada is powered by the S52 engine, a higher performance version of the M52.

The M52 and S52 engines were on the Ward's 10 Best Engines list from 1997 to 2000.

Compared with its M50 predecessor, the M52 uses an engine block made from aluminium. However, cars in the United States and Canada (except for the Z3), use a cast iron engine block, as per the M50. The largest version of the M52 is 2.8 litres, compared with 2.5 litres for the M50.

As per the later versions of the M50, the M52 uses variable valve timing on the intake camshaft (called single VANOS by BMW). The redline is 6,500 rpm.

In 1998, the M52TU ("technical update") was released, adding variable valve timing to the exhaust camshaft (called dual VANOS by BMW). Other upgrades included electronic throttle control (which uses a throttle cable as backup), a dual length intake manifold (called "DISA" by BMW) and revised cylinder liners.

A 1,991 cc (121 cu in) version was introduced in 1994. Bore is 80 mm (3.1 in) and stroke is 66 mm (2.6 in). The compression ratio is 11.0:1.

Applications:

The "technical update" in 1998 included dual VANOS, which improved low rpm torque.

Applications:

2.4 L. For Thai market only. The bore is 84 mm (3.3 in) and the stroke is 72 mm (2.8 in).

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Wikipedia