BMW N52B25 engine

This engine was produced from 2005 to 2011. It has aluminum and magnesium as the basic material for the cylindrical block. It also has an injector as a power system. The engine type is again inline, but there are 6 cylinders. Each cylinder has 4 valves as standard. The piston stroke is 78.8 millimeters. And the cylinder diameter is 82 millimeters. The compression ratio is 11. The unit has a volume of 2.5 liters, which helps to perform difficult tasks on the road. Power is 177 horsepower at 5800 rpm. At 6400 rpm, it is 204 horsepower and at 6500 rpm, it reaches the 218 horsepower mark. Maximum torque at 3500-5000 rpm is 230 N*m. At 2750-4250 rpm it reaches the 250 N*m mark. 95 gasoline will be the best solution in order to drive comfortably.

The Euro 5 environmental standard helps to protect the environment from excessive pollution as far as possible. The engine weighs approximately 120 kilograms. Gasoline consumption on the highway is 6.4 liters per 100 kilometers, in mixed territory it reaches 9.3 liters. But in the city this figure will be about 12.1 liters per 100 kilometers and this is a very large figure. Oil consumption will reach almost 1000 grams per 1000 kilometers.

5W-40 or 5W-30 oil is an excellent choice for the unit. It holds about 6.5 liters of oil at a time. It is necessary to pour about 6 liters of oil during the replacement period. And the replacement should be carried out every 10 thousand kilometers. The temperature of the device in working condition is about 95 degrees Celsius. The engine resource will be at a mark of about 200-250 thousand kilometers. In the potential tuning will help to achieve 280 horsepower of power. The unit is installed mainly on 323i, 325i, 523i, 525i, X3, Z4.

N52B25 engine specifications

Advantages

The engine from the new series has replaced its equally popular predecessors. The previous evolutions are quite unlike it, because it is completely new. The cylinder block is made of aluminum and magnesium to emphasize the lightness of the design. The Cinder Block has also become lightweight and the crankshaft has received a lot of changes. The cylinder head has been updated by the developers and has again received a system that changes the phases of gas distribution on both shafts. This dual Vanos is meant to refine and improve the performance of the engine.

Valve lift has also received a new system in order to improve fuel economy and add noticeably to the output. The timing drive provides a chain, which got the application of length on the intake itself and applied manifold. The required injectors are also installed in the cylinder head, and the latest system from the global developer Siemens is used to control the unit. The unit is used for cars with the index 25i or 23i. Already after two years, the engine received a replacement in production. And further other versions were also removed from production in connection with the release of the latest models.

Disadvantages

The main problem is that there is a huge oil consumption. The removable rings are too thin and they get dirty very quickly. The caps are almost impossible to remove for cleaning. This happens even up to a mileage of 100 thousand kilometers. The driver should always check the condition of these parts and, if necessary, change the rings and caps. It is also worth checking the crankcase gas ventilation valve. The problem was solved in the very first versions of the engine.

Catalytic converters can become clogged if the driver does not clean the previous parts. New catalytic converters are very expensive, so the problem is solved by buying new flame arresters.

The ticking sound doesn’t even appear while driving and usually happens on 2009 engines. The motor does not get bad effects, but the sounds are very stressful for drivers.

The rpm’s can fluctuate. This is caused by the Valvetronic. Also, the Vanos valves or flow meter may be to blame. This can appear if the owner changes the oil very infrequently. Initially it is worth flushing the Vanos valves, if the problem does not disappear anywhere, then it will have to be replaced. The engine very often overheats, the cooling system should be constantly checked by the driver to avoid problems. The radiator should also always be clean, the electronic pump should always be working, and it should be changed every 80-100 thousand kilometers. To reduce the possibility of danger, you need to pour high quality oil, which is recommended by the manufacturer. Gasoline is also not a place to save money. With this engine, experts do not recommend buying a car.

Modifications

The U1 was produced from 2005 to 2008 and is the base engine of the series. The intake manifold reduces power here to 177 horsepower at 5800 rpm. Maximum torque here is 230 N*m at 3500-5500 rpm. It is suitable for BMWs with the 23i index.

The regular mod was produced from 2009 to 2011, it has a completely different intake manifold. Its output is 204 horsepower at 6400 rpm. The maximum torque here at 2750 rpm is 250 N*m. This version is also available for BMW with the index 23i.

The O1 was produced from 2005 to 2009 and was the most popular version. Power in it was 218 horsepower at 6500 rpm. But the maximum torque in this case at 2750-4250 rpm was equal to 250 N*m, as well as in other versions. This unit is produced for BMW with the index 25i.

Chip tuning

The motor is not much adapted to refinements of various types. It would be better to buy a powerful car. But in case of tuning you can use a Chip. Sport exhaust system is present in the market and it can be bought. Also an air filter will also be a great solution. All these replacements will help to increase the power by about 20 horsepower. In the case of the 23i index, you can buy an intake manifold from the next generation or modifications. This will help to add another 15 to 20 horsepower and get the maximum power.

In addition, the driver can splurge on a brand new supercharger. Compressor kit will improve the power on the stock with pistons almost to 300 horsepower. But this venture is very expensive and installing another engine with more powerful characteristics will cost the user less.

This engine is installed on the following models:

BMW 3-Series (E90)

BMW 5-Series (F10)

BMW X3 (E83)

BMW Z4 (E89)

BMW Z4 (E85)