Characteristics of the M54B25 engine
| Characteristics | Value |
|---|---|
| Manufacturing | Munich Plant |
| Engine make | M54 |
| Years of manufacture | 2000-2006 |
| Cylinder block material | aluminum |
| Power system | injector |
| Type | row |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 75 |
| Cylinder diameter, mm | 84 |
| Compression ratio | 10.5 |
| Engine displacement, cc | 2494 |
| Engine power, hp/rpm | 192/6000 |
| Torque, Nm/rpm | 237/3500 |
| Fuel | 95 |
| Environmental standards | Euro 3-4 |
| Engine weight, kg | ~130 |
| Fuel consumption, l/100 km (city / highway / mixed.) | 14.0/7.0/9.4 |
| Oil consumption, gr./1000 km | to 1000 |
| Engine oil | 5W-30, 5W-40 |
| How much oil in the engine, liters | 6.5 |
| Oil change is carried out, km | 10000 |
| Engine operating temperature, deg. | ~95 |
| Engine life, thousand kilometers | ~300 (according to the factory), ~300 in practice |
| Tuning, hp (potential/no loss of resource) | 300+ / n.d. |
| The engine was installed in | BMW 325i E46 |
| BMW 525i E39 | |
| BMW 525i E60 | |
| BMW X3 E83 | |
| BMW Z4 E85 | |
| BMW Z3 |
Reliability, problems and repair of BMW M54B25 engine
A very popular 2.5-liter representative of the M54 series (which also included the M54B22, M54B30 and S54B32) appeared in the production line of BMW in 2000 and replaced the M52TUB25. Differences of M54 from M52: the cylinder block of the new engine remained old, aluminum with cast-iron liners and with cast-iron crankshaft, connecting rods were changed (145 mm), lightweight pistons appeared.
The cylinder head remained the same with a double vanos, the long intake manifold was replaced with a new short one (-10 mm from M52TU) with wide DISA channels, which allowed to increase power and let the motor breathe freely. In addition, a 64 mm electronic throttle and Siemens MS43/Siemens MS45 (Siemens MS45.1 for US) control system are used.
This motor was used in BMW vehicles with the 25i index.
Between 2005 and 2006, the M54B25 engine was displaced by the next generation of inline sixes with a displacement of 2.5 liters – N52B25.
Disadvantages, breakdowns and problems of the M54
- This engine is very afraid of overheating, keep an eye on the cooling system
- If the piston rings are too thin, they will quickly seize up and cause oil build-up
- Another source of lubrication loss here is the crankcase vent valve
- The DISA flaps in the intake manifold are often stuck, and the intake manifold itself can crack
- If the oil is of poor quality, it can damage the hydraulic compensators and the Vanos phase control valve
- Electrically, the camshaft and crankshaft position sensors fail most often
- Valve cover leaks with oil leaking into the plug wells
BMW BMW M54B25 engine tuning
Stroker 3L
One of the most common methods of increasing the power on a 2.5 M54, is to convert it into a 3 liter motor (Stroker). To increase displacement, we need to buy the crankshaft, connecting rods, pistons, the entire intake, intake camshaft, injectors and brains from an M54B30. After this stroker kit, the power will increase to 230hp.
For even more power increase, you need to buy Schrick sport camshafts with 264/248 phase and 10.5/10 mm lift, cold intake, equal-length exhaust manifold and full straight-through exhaust. After tuning, we’ll get about 260-270 hp.
M54B25 Turbo
To build the M54B25 Turbo, you need to repeat all the same procedures that were done with the M52B28. Standard M54 pistons and connecting rods will handle about 400 hp.
M54B25 Compressor
An alternative to all of the above can be the purchase of a good compressor kit from ESS, installed on standard pistons and produces ~300 hp. Its huge disadvantage is the price, unaffordable for most owners of M54 motors.
MOTOR RATING: 4+