3 5 Liter Engines Of The M30 Family. BMW M30 Engine

  In 1986, the M30B30 engine began to be installed on a new, at that time, BMW 730i E32. Such a motor had a compression ratio of 9.2 and developed 197 hp. at 5800 rpm A version with a catalyst and a compression ratio of 9 was produced, its power was 188 hp. at 5800 rpm

Later, on the basis of a 3-liter engine, the M30B32, M30B35 and other well-known engines of the M30 series were built.   The M30B30 was discontinued in 1994, along with the BMW 730i E32, and instead began to produce the BMW 730i E38, with a new 3-liter engine with a V8 configuration - M60B30.

Problems and disadvantages of BMW M30B30 engines

The main diseases, problems and malfunctions of the 3-liter M30 are no different from the larger counterpart in the series - M30B35. You can familiarize yourself with them in more detail.

BMW M30B30 engine tuning

M30B30 Stroker

The three-liter M30, by simple manipulations, can be turned into the M30B35. To do this, you need to buy pistons, crankshaft and brains from the M30B35, and also bore the cylinder block up to 92 mm. The connecting rods remain standard, with a 3.5 liter engine pistons with a lower compression height. If you leave the cylinders stock and install only a crankshaft with a stroke of 86 mm, as well as pistons from the M30B32, then the output will be M30B32. There is no big sense in this, because fuss a lot, and an increase of about 10 hp, if you make a stroker, then up to 3.5 liters. (although here do not expect a big increase). After increasing the displacement, it would be nice to buy a cylinder head from the M30B35, with larger intake valves. And if it came to a head, then it is desirable to finalize it, install the Schrick 284/280 camshaft, springs and reinforced rockers, make a normal direct-flow exhaust, a cold inlet and adjust the brain. In the end, the alteration will be very expensive, and you will get an increase in the region of 50-60 hp.   Bottom line: buy the M50B25 or M54B30, save time.   On the basis of the M30B30, you can build a turbo project as well as with the M30B35.

For several decades, he has been driving cars of the fifth series of the iconic BMW brand. We offer a review of the BMW M30 engine

Description

BMW M30 is an in-line gasoline six-cylinder twelve-valve engine with a direct arrangement of cylinders. Various modifications have a working volume of 2.5 to 3.4 liters.

The BMW M30 inherited many of the features of the earlier BMW M10 engine: a cast-iron block, aluminum cylinder heads and a camshaft chain drive. The cylinder heads are unified throughout the BMW engine lineup. The engine is characterized by the transverse movement of gases, the three-spherical shape of the combustion chambers, the V-shaped arrangement of the valves, the upper position of the camshaft.

The M30 engine was a significant success for BMW engineers. Developed in the first versions back in the late 1960s, it was installed on production machines until the early 90s

Features BMW M30

Model	M30B25	M30B28	M30B30	M30B32	M30B34	M30B35
Volume, l / cc	2.5/2494	2.8/2788	3.0/2986	3.2/3210	3.4/3430	3.4/3428
Horsepower / rpm	150/5500	184/5800	188/5800	200/5000	185-220/5400/5700	211/5700
Max. cr. moment, Nm / rpm	215/4000	240/4200	260/4000	285/4300	305-311/4000	305/4000
Injector injection	L-jetronic	L-jetronic	Motronic	L-jetronic	Motronic	Motronic
Bore / Stroke, mm	86/71	86/80	86/80	89/86	92/86	92/86
Compression ratio	9.6	9.3	9.0	9.0	8.0/9.0	9.0

The M30 engine was powerful and heavy. This, on the one hand, predetermined its reliability and throttle response at low speeds, but on the other hand, blocked the road to motorsport. The piston system is too massive, and the piston stroke is too large, which complicates acceleration and increases the load on the bearings.

Nevertheless, on serial "civilian" machines, the motor has proven itself perfectly. It was installed for two decades mainly on cars of the fifth series.

M30B25	BMW 525 (E12 body)	1973-1976
BMW 525 (E12 body)	1976-1981
BMW 525i (E28 body)	1981-1987
M30B28	BMW 528 (E12 body)	1975-1976
	BMW 528 (E12 body)	1976-1978
	BMW 528i (E12 body)	1977-1981
	BMW 528i (E28 body)	1981-1987
M30B30	BMW 530 (E12 body)	1975-1978
	BMW 530i (E12 body)	1975-1978
	BMW 530 MLE (E12 body)	1976
	BMW 530i (E34 body)	1988-1990
M30B32	BMW 533i (E12 body)	1979
	BMW 533i (E28 body)	1983-1984
	BMW 333i (E28 body)	1984-1986
M30B34	BMW 535i (E28 body)	1985-1988
	BMW 535is (E28 body)	1987-1988
M30B35	BMW 535i (E34 body)	1988-1993

Disadvantages of the BMW M30 engine

For the BMW M30 motor, only a few “diseases” are characteristic, which manifest themselves mainly as a result of prolonged intense operation:

• the appearance of cracks in the cylinder blocks from the hole for the head bolt to the cavity of the cooling jacket. This leads to increased consumption of coolant and the appearance of traces of the emulsion in the oil.
• increased noise during wear of the “eccentric washer - end of the valve stem” pair. This also creates problems when adjusting the thermal clearance in the valve drive mechanism.
• high sensitivity to the quality of engine oil. It is not recommended to fill in mineral oils in M30, - he prefers synthetics. And when operating at high engine speeds of 2.8 liters or more, experts recommend installing an oil cooler.

Initially, on the basis of the M30 engine, a model was developed with two camshafts and a double-row chain, as well as 4 valves per cylinder. The cylinder head consisted of two parts: the lower one formed the combustion chambers and the “cooling jacket”, and the gas distribution mechanism was located in the upper one. Fuel was injected individually into each cylinder, through a special Kugelfischer intake manifold, 6 distinctive intake pipes were present on the cylinder head. This version of the engine was installed from 1978 to 1981 on BMW M1 supercars and had a power of 277 hp.   Later, during the fuel crisis, the same engine, with minor modifications and the M88 / 3 coding, was installed on the BMW M635CSi, and later received the marking S38 B35.   The modification of the M88 engine of the M1 sports car, which was intended for racing in the Procar series, was boosted to 470 - 490 hp. This unit was distinguished by new camshafts, larger valves, forged pistons, and solenoid valves were used in the intake system (instead of throttles), in addition, a modified exhaust manifold was installed.   To participate in Group 5 races, the engine power was increased to 850 - 900 hp. by additional installation of two turbochargers. Such a power plant received an index - M88 / 2.   From 1985 to 1987, the M88 was used in the BMW M5 and from 1983 to 1989 in the BMW 6 Series - the M635CSi. This engine modification had an index of M88 / 3 and developed a power of 286 hp.

So, there were the following options:

BMW M88 / 1 engine

The M88 / 1 engine was the first iteration of the M88 and was installed on the BMW M1. Engine displacement is 3453 cc. He produced 277 hp. (207 kW) at 6500 rpm and 324 Nm at 5500 rpm. It was produced from 1978 to 1981.

BMW M88 / 2 engine

Engine displacement is 3453 cc. For the 5th race group, the M88 engine was turbocharged and became known as the M88 / 2. This racing engine produced up to 900 hp. (670 kW).

BMW M88 / 3 engine

The M88 / 1 engine also known as S31B35ME has been modified for use in the BMW E24 M635 CSi and BMW E28 M5, this engine was known as the M88 / 3. Engine displacement is 3453 cc. The Kugelfisher fuel injection was replaced by Bosch Motronic and the engine produced 286 hp. (213 kW) at 6,500 rpm, and the torque was 340 Nm at 4,500 rpm. The M88 / 3 engine was also installed on the South African model BMW E23 745i, due to problems with turbocharged packaging in the M102 engine, which was used in other markets. The BMW M88 / 3 engine was produced from 1983 to 1989.

BMW M90 engine

A smaller M90 engine with single overhead camshaft (SOHC) of 3453 cc, which was based on the BMW M88 engine. It uses the same M88 unit and maintains the same bore and stroke, but uses Bosch Motronic to inject fuel instead of the Bosch L-Jetronic. Produced from 1978 to 1982. Used on the BMW E24 635CSi, BMW E12 M535i and BMW E23 735i.

Specifications:   Modification: M88 / 1   Volume 3453 cm3   Bore, 93.4 mm   Stroke 84 mm   Compression ratio 9.0: 1   Power @ RPM [email protected]   Max. Torque @ RPM [email protected]   Injection Type: Kugelfischer

The engines of the BMW M30 series are representative of the old people. This is a large inline six that the world saw in 1971. From 1971 to 1975, the engine was equipped with carburetors, after which the injection system became an injector.

Characteristics and features of motors

The M30 engine received a volume of 3.0 liters. Cast iron block paired with an aluminum head, without modern bells and whistles. The gas distribution mechanism has a chain drive.

BMW E21 with M30 engine

The carburetor model M30B30 appeared together with the injection model in 1971, had a compression ratio of 9 and developed 180 hp. at 6000 rpm The injection model came with a Bosch D-Jetronic injection and a compression ratio of 9.5, which made it possible to remove 200 hp. at 5500 rpm

Since 1976, Solex Zenith 35/40 INAT carburetors have been replaced with Solex DVF-4A1. The power of such engines increased to 184 hp. at 5800 rpm, and since 1979, instead of carburetor M30B30, injector M30B28s were installed.

M30 engine

In 1975, the injection M30B30s were modified: the compression ratio was reduced to 9, the injection was replaced by the Bosch L-Jetronic and this affected the power, which dropped to 195 hp. at 5800 rpm

In 1986, the M30B30 engine began to be installed on a new, at that time, BMW 730i E32. Such a motor had a compression ratio of 9.2 and developed 197 hp. at 5800 rpm A version with a catalyst and a compression ratio of 9 was produced, its power was 188 hp. at 5800 rpm

Consider the main technical characteristics of the motors of the M30 series:

Service

Maintenance of M30 motors is no different from standard power units of this class. Maintenance of motors is carried out at intervals of 10,000 km. Recommended maintenance should be carried out every 7,500 km. So, consider a detailed technical service chart:

TO-1: Oil change, oil filter change. Carried out after the first 1000-1500 km of run. This stage is also called break-in, since grinding of the motor elements occurs.

TO-2: Second maintenance is carried out after 10,000 km. So, again changing the engine oil and filter, as well as the air filter element. At this stage, the pressure on the engine is also measured.

MOT-3: At this stage, which is carried out after 20,000 km, a standard oil change procedure, replacement of the fuel filter, as well as diagnostics of all motor systems are carried out.

TO-4: Fourth maintenance is perhaps the easiest. After 30,000 km, only the oil and oil filter element change.

TO-5: The fifth TO for the engine, like a second wind.

Typical malfunctions

In principle, all motors are similar in design and performance. So, let's consider what common problems can be found on the M30:

The process of repairing a BMW M30 motor

1. Oil leak. It occurs as a result of the breakdown of one of the gaskets.
2. Overheat. A common cause of a BMW malfunction. In this case, it is worthwhile to diagnose the cooling system - the thermostat, water pump or radiator.
3. Does not start. The problem may be hiding in a gasoline pump or candles. It is worth checking the remaining elements of the fuel system.

Output

The M30 engine is an old man worthy of respect. Maintenance and repair of the power unit can be carried out independently. Many motorists of the late 80s - early 90s remember this power unit, and are aware of its reliability.

BMW M30B35 / M30B34 engine

Characteristics of the engine M30V35

Production	Munich plant
Engine make	M30
Years of release	1982-1992
Cylinder block material	cast iron
Supply system	injector
Type of	in-line
Number of cylinders	6
Valves per cylinder	2
Piston stroke mm	86
Cylinder diameter mm	92
Compression ratio	8.09.0 10.0(see description)
Engine displacement, cc	3430
Engine power, hp / rpm	185/5400 211/5700 218/5500 (see description)
Torque, Nm / rpm	290/4000 305/4000 310/4000 (see description)
Fuel	92
Environmental standards	-
Engine weight kg	~145
Fuel consumption, l / 100 km (for E34 535i)   - city   - track   - mixed.	17.38.0 9.8
Oil consumption, gr. / 1000 km	up to 1000
Engine oil	5W-30   5W-40   10W-40   15W-40
How much oil is in the engine, l	5.75
Oil change is carried out, km	7000-10000
Engine operating temperature, deg.	~90
Engine resource, thousand km   - according to the factory   - on practice	- 400+
Tuning, hp   - potential   - without loss of resource	800+ n.d.
The engine was installed	BMW M535i E28   BMW 535i E34   BMW 635 CSi E24 BMW 735i E32   BMW M535i E12   BMW 735i E23

Reliability, problems and repair of the BMW M30B35 / M30B34 engine

Until the 1992 appearance of the M60 series, with the configuration of the V8, its place was occupied by large-volume in-line sixes, called the M30. Despite the fact that the M30 was produced simultaneously with the M20 (also in-line 6-cylinder), the 30th model has more in common with the younger four M10. The first M30s appeared almost 50 years ago, and over time they were constantly being developed and modernized. One of the top options called the M30B35 / M30B34 was released in 1982 and was intended for BMW cars with the index 35i.

The BMW M30B35 / M30B34 engine is a straight six in the cast iron cylinder block, the same as the M30B30, but the crankshaft has a piston stroke of 86 mm (versus 80 mm for the M30B30), the cylinder diameter is increased from 89 mm to 92 mm. The height of the cylinder block is no different. The length of the connecting rod is 135 mm, the compression height of the piston is 39.85 mm.   The cylinder head M30B34 / B35 is single-shaft with 12 valves,