BMW M30B28LE engine

The line of power units BMW M30 was completed on cars of the German concern from 1968 to 1992. It was produced en masse and in different modifications. Internal combustion engines received six cylinders with two valves on each of them. As of 2018, this powertrain is considered obsolete both from the moral side and from the technical side, but despite this it confidently pushes some cars forward to this day. This powertrain is considered one of the most successful in the history of the BMW concern. This is noted not only by us. Most foreign journalists, technical experts and engineers consider this engine to be the most perfect for its time, naturally. It is unpretentious in service, due to its simple design.  The engine has no serious maintenance problems and has an incredible service life. Today we will talk about the modification of m30 with the index b28. From 1976 to 1979, this engine, as well as m68 was supplied with Solex 4A1 carburetor. Despite this modification, the engine did not get new horsepower and torque increase. But this carburetor corrected the problems that were associated with the synchronization of the dual system. In 1977, Bavaria Motors engineers introduced an injector version for North America, which had 177 horsepower on board. After 2 years, the motor receives a modern, for those times, electronic injection system L-Jetronic. And in 1980, engineers decided to replace the double camshaft chain and install a conventional chain.

If we talk about dry technical characteristics, the engine was produced from 1968 to 1992. It possessed a cast-iron cylinder head. As for the power supply of the power unit, an injector is used. This is a six-cylinder inline engine. There are a total of 12 valves, two per cylinder. The piston stroke is 86mm in a cylinder with a diameter of 92mm. Many versions of the m 30 were produced, so the compression ratio depends on each specific version. In our case, this value is equal to 8. Power from 210 horsepower. Torque 218 Newton meters at 4000 rpm. As for the fuel consumed, from the factory it is recommended to use 92 gasoline. The mixed fuel consumption of these internal combustion engines is about 10 liters per 100 km. In view of the technical imperfection of the engine, (the first types appeared in 1968) from has a serious oil consumption of up to 1 liter per 1000 km. By the way, the full volume of oil in the engine is about 6 liters.

The operating temperature is about 90 degrees Celsius and the resource is more than 600,000 kilometers. Cars on which this power unit was installed are limited to BMW models from 5 to 7 series. The protagonist of our review was put on these cars of the earliest years of production. M30B28 is a power unit with a volume of 2.8 liters. It has a serious, at those times, power of 170 horsepower. Cars with this power unit reach the first 100 km per hour in 10.5 seconds. It is found on sedans from the concern BMW 5 and 7 series. The huge resource of this internal combustion engine is justified by the high power and unpretentiousness of the design. Strong and powerful engines are less loaded with calm and measured urban driving. This is the main reason for their durability.

The M30B28 engine has an exact displacement of 2,788 cubic centimeters. Depending on the manufacturer and the condition of the powertrain, the maximum power with which the engine left the factory was 184 horsepower. The driver, in order to get this power would need to reach a whopping 6,000 rpm. But, in order to get the maximum 240 Nm of torque you need to accelerate the engines to just 4200 rpm. This is an injector engine with l-jetronic power system. Zenith 35/40 INAT carburetor

M30B28LE engine specifications

Advantages

It is a motor with 6 cylinders, which are arranged in a row. It is based on a cast iron block. There is only one camshaft in the cylinder head. The main vulnerability of the design is the lack of hydrocompensator. That is why, after every 7-10 thousand kilometers it is mandatory to adjust the valves. Instead of a timing belt, a chain with a huge resource is used.

Disadvantages

Despite the high life and incredible power reserve, the motors in this series have certain problems. The first one is related to high operating temperature. But in most cases, the problem is solved in the deficiencies of the cooling system. The radiator has small honeycombs, due to which it can be trivially contaminated with frozen dirt. If you fry the engine above the operating temperature, the main cylinder block will simply lead.

The next problem faced by owners of M30 motors is cracks in the cylinder block, which form exclusively near the bolt threads. They come out of the factory with this problem. And the main reason is that the master, who assembled the engine, did not remove grease from the thread wells. This problem is rarely repaired, so it is necessary to replace the cylinder block.

But we must also take into account the fact that by the end of 2018, these engines are technically and morally obsolete. Their resource is banal rolled out. Modern owners meet with interruptions in the operation of the distribution mechanism, valves are banally worn out, as well as crankshaft bushings.

This engine is installed on the following models:

BMW 5-Series (E28)

BMW 5-Series (E12)

BMW 7-Series (E23)