BMW M52B25TU Engine

This engine was produced from 1995 to 2001. The cylinder block was made of aluminum, and the injector was still used as the power system. The inline type of arrangement was present here, which was a common standard. There were 6 cylinders, and 4 valves were available for each of these cylinders. The piston stroke is 75 millimeters in this case, but the cylinder diameter is 84 millimeters. The compression ratio of this version will be 10.5. The volume of such an engine is 2.5 liters, which makes it possible to feel the full power of the part.

At 5500 rpm, the power of the apparatus was 170 horsepower. And the maximum torque at 3500 and 3950 rpm remained unchanged and amounted to 245 N*m. The weight of the engine is approximately from 165 to 175 kilograms. Gasoline consumption in the city is 13 liters per 100 kilometers, on the highway this figure falls to 6.7 liters per 100 kilometers, and in mixed territory it is equal to 9 liters per 100 kilometers. Oil consumption in this case is again equal to almost 1000 grams per 1000 kilometers. For the engine are suitable oils 10W-40, 5W-40, 0W-40, 5W-30, 0W-30. At the same time in the engine is about 6.5 liters of oil. Replacement is recommended every 7-10 thousand kilometers.

Specialists consider 95 degrees Celsius to be the approximate operating temperature of the device. In practice, it turns out that the resource of the product is about 250 thousand kilometers. With proper tuning, you can achieve more than 500 horsepower in potential.

M52B25TU engine specifications

Advantages

This engine comes from a fairly new family. It was introduced in 1995 and was at first a replacement for its predecessor. The lower geometry did not change at all, and the developers replaced the cast iron block with an aluminum block. In addition, they put a nickasil coating for all cylinders, improved connecting rods and pistons. The length of the new connecting rod was 140 millimeters, the compression height of the pistons is about 32.5 millimeters. The exhaust system was completely changed, the cylinder head was used in the style of similar models. But the system for gas distribution and its phases became used on all engines. The injectors were also improved to achieve better production results.

A technical change in 1998 greatly influenced the series in the future. It introduced cast iron liners for the cylinder block. And a second phase rotator was now used on the exhaust shaft. Some lift camshafts, connecting rods and pistons received quality upgrades. A disa intake manifold, the latest cooling system and an electronic throttle slide couldn’t fail to please experienced drivers.

This unit emphasized torque over power from the other series. After 2000, the engine was superseded by newer members of the series and sixes, and in 2001 production of the parts was completely ended.

Disadvantages

First, the engine is prone to overheating. Along with the previous series, it deteriorated the HGB. Often a good radiator cleaning, running air, checking the pump, radiator cap and thermostat helped. Huge oil usage occurs with weak piston rings. In the case of intact cylinder walls, the user can only change the rings. But if the walls are worn out, it is necessary to liner the block and check the HVAC in the service.

Ignition is sometimes missed. Hydraulic compensators tend to coking and severely reduce cylinder performance. And the ECU, in order to prevent bigger accidents, shuts down the system. You have to buy new hydraulic compensators.

The oil cap can sometimes light up. The tumbler or pump is to blame, a good third party check is needed. Vanos can carry power drops, floating revs or characteristic sounds. All of these will be dangerous, as it will wear out. Therefore, the purchase of a vanos repair kit will be necessary.

Crankshaft position sensors can break, and camshaft parts are not entirely reliable. The threads on the mounts are not good enough, the resource is also less than previous versions. This motor will not be the best option, and for swap with tuning professionals often choose other apparatuses. Although experts give good marks to this engine.

Modifications

The M52TUB25 was produced from 1998 to 2001 and received an updated gas and phase distribution system. Another phase rotator was also added and the system even had a name change. The cast iron liners in the cylinder block did a great job of helping to handle the stress, the piston and connecting rod group changed quite a bit. Other camshafts helped with improved compression ratio, power and torque.

The M52B25 was produced from 1995 to 1999 and was a completely basic version. Compression ratio, power and torque were standard in this version.

Chip tuning

A new cold intake, intake manifold from other versions will work to increase power. Distributor shafts with small phases and lifts will improve the tuning perfectly. This will help make 210 to 220 horsepower.

The displacement can also be increased to 2.8 liters by installing a stroker whale for the cylinder block. This will be accomplished by purchasing a crankshaft and connecting rods from other models. You will also need to get updated firmware, and the pistons can be left in. The intake, camshafts, and exhaust will need to be tuned and matched to the motor’s resources.

Turboing often doesn’t give the same result as the above mentioned features, but for supercharging you can try repeating all the procedures from previous versions.

This engine is installed on the following models:

BMW 3-Series (E46)