BMW M30B30 engine

The main hero of this article is the M30B30 engine from Bavaria Motors. The M30 lineup was the most successful in the history of the entire concern. The engine has a single camshaft, which was installed on the engine for 30 years. It was a successful technical decision of the BMW concern. This line of engines was honored with several prestigious engineering awards. Among them – the Best Engine of the XX century. Among car enthusiasts, this line of engines was nicknamed “Big Six”

BMW cars with the index 30 and 30i, which were produced from the early seventies to the end of the eighties, had this power unit on board. It is a large inline six, with a working volume of 3 liters. The basis of the engine is a cast-iron cylinder block. Absolutely identical engine m30 28 index. The only difference is the enlarged cylinders, with a diameter of 89mm. The crankshaft of the engine runs 80mm long and the connecting rods are 135mm long. This is a true old-school engine. The cylinder head is simple to the point of impossibility.  There are no phase shifters or hydrocompensators. The timing is not a belt, but a chain.

M30B30 engine specifications

Disadvantages

As for problems, they are pretty much the same for the M30 series. The most important problem was overheating. Very often high operating temperature led to the fact that the master cylinder simply drove. But, in order for this not to happen, it is enough to clean the radiator in time, monitor the coolant level, and change the pump in the cooling system in time.

Cracks in the cylinder block are the second most common problem. It came from the factory. The cracks were formed because there was oil in the threaded wells. They tried to fix this problem, but nothing good came out of it. The most rational way out was to buy a used cylinder block.

Injector and carburetor

As for mixing the mixture to the combustion chamber, engineers from Germany used both injector and carburetor model M30 with the index B30. But these two models appeared in 1971. The carbureted version of the engine had 180 horsepower under the hood, but to get it, you need to accelerate the engine to 6000 rpm.

The injector had Bosch D-Jetronic injection and produced 20 more horsepower at 5500 rpm. After 5 years, carburetors brand Solex Zenith 35/40 INAT significantly improved, and began to install a more advanced Solex DVF-4A1 as a result, engineers were able to squeeze out an additional 5 horsepower, at 5800 rpm.

Injector engines were also subjected to changes. In 1975, engineers decided to modify the m30 b30, reducing the compression ratio to 9 units. This had a direct effect on the engine’s output, which was reduced by 5 horsepower. Therefore, in order to develop 195 horsepower, the engine had to be cranked an additional 300 revolutions more. The protagonist of our issue was removed from production in 1994.

Chip Tuning

As for tuning, the m30 with index b30 can be turned into a b35 version in terms of performance. The addition of about 10 horsepower is achieved by boring the cylinder block and pistons, replacing the crankshaft and brains from. Therefore, tuning b30 to the performance that is in the engine with the index b32 makes no sense. As for the turbos, from the factory they have a lowered compression ratio. It makes absolutely no sense to manipulate the stock snail. On the Chinese market, especially in 2018, Chinese Turbo-kits are sold, along the lines of the Garret G35. This cochlea is capable of inflating one bar. As a result, the engine will get about 400 horsepower. It’s a cheap way to do it. In order for the system to be not only productive, but also reliable, you need to put the original Garret. Preferably at a profiled service station.

This engine is installed on the following models:

BMW 5-Series (E34)

BMW 7-Series (E32)

BMW 7-Series (E23)