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5 Series
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  #1  
Old 06-24-2003, 05:13 PM
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WAM WAM is offline
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The History of the BMW 5 Series

The concept originated in the late fifties; its success continues today. At the time, BMW made
the decision to develop an automobile which had not existed in Germany yet: a stylish, mid-sized
four-door car with a sporty chassis and a powerful engine and was comfortable enough for
five passengers and agile enough for fast motoring. The marketing strategists gave it the name
"The New Class" and in 1961, the BMW 1500 was born.

The design of the New Class was neither conservative nor was it influenced by the American
style. Instead, it was more reminiscent of Italian lines - after all Giovanni Michelotti had been
involved in the design. The overhead cam inline 4-cylinder engine was the first German touring
sports engine. With a maximum output of 80 horsepower at 5700 rpm, the BMW 1500
approached a top speed of 93 miles per hour.

The suspension of the new BMW attracted particular attention. The wheel location of the front
wheels was provided by a transverse link, supported by a tension strut and a McPherson strut.
The rear wheel suspension was particularly sophisticated, controlled by a rubber-mounted
semi-trailing arm bolted to the differential. The driving response remained neutral in virtually all
conditions; the suspension was tight but not uncomfortable. The interior provided safety
features such as padded upper and lower edges on the instrument panel and a padded steering
wheel hub.

The BMW 1500 found a very positive response, both among the international automobile press
and customers. Only a year after the start of production, a sibling model with a 1.8-liter/ 90
horsepower engine - the BMW 1800 - was put on the market. In 1964 and 1966 respectively, the
BMW 1600 and 2000 followed. And in 1969 the top model of the New Class appeared in the
form of the BMW 2000tii, the first BMW serial production model to have a fuel injection system.
As early as August 1965, BMW customers could order an automatic transmission for the first
time, as the 1800 model was also available with an optional ZF three-speed automatic
transmission.

Up to the end of production in 1972, the New Class had become the most successful BMW
model series, with 329,626 cars leaving the production line in Munich. BMW had finally achieved
the step of becoming a successful mass producer of automobiles.

Code Name E12: The First Generation of The BMW 5 Series
"The new 2-liter 4-cylinder car of the Bayerische Motoren Werke bears the model designation
BMW 520 ('five-twenty'), diverging from previous designation practice. Here, the first figure
refers to the body type, the second and third to the engine capacity." With this statement, a new
generation of automobiles was presented at the Frankfurt Automobile Show in 1972: the 5
Series.

The appearance of the two models initially presented, the BMW 520 and BMW 520i, was
characterized by a whole new design style: large window areas and a deep waistline were the
most striking features of the new shape, along with the typical double headlights. In the cockpit,
a markedly economical functionality dominated. BMW had created a style, which was to last for
decades, making the brand unmistakable to this day.

In the design of the body, which offered further improved passive safety as compared to its
predecessor, BMW had for the first time made more extensive use of computer technology - still
in its infancy at this time. Computer-calculated front and rear crush zones with controlled,
optimum deformation guaranteed the greatest possible occupant protection at the time, with a
high degree of body stiffness being achieved by means of roll-over bars integrated in the roof
construction.

New 4-Cylinder Engine With Swirl Combustion Chambers
Experience with the new 6-cylinder engines, in production since 1968, was a key in the
development of the revised 2.0-liter 4-cylinder engines, both in the BMW 520 with two
Stromberg side-draft carburetors and the BMW 520i with fuel injection. The combustion chamber
was developed into a triple sphere swirl pan with combustion concentration at the spark plug,
resulting in a high anti-knock index and low fuel consumption. On the chassis side, too,
considerable advancements were made beyond the New Class. The wheelbase and track were
significantly enlarged, the front axle with individual suspension and transverse link, tension strut
and stabilizer now had struts tilted back at an angle of 12 with trail. The sophisticated rear axle
semi-trailing arm developed by BMW remained essentially unchanged. All in all, spring travel was
lengthened by 20 mm and the car displayed easily controllable driving qualities with sporty but
comfortable overall suspension settings.

The new models were well received and as usual the performance-oriented BMW clientele soon
wanted additional, even more powerful models. So only a year passed before BMW brought the
first 5 Series model with a 6-cylinder engine to the market, in the form of the BMW 525. In 1975,
the 165 horsepower 528 followed. Both models were fitted with carburetor engines borrowed
from the big series (2500 and 2800) which promised superior driving performance. In particular
the balanced BMW 525 developed alongside the BMW 520 into the most successful
representative of the series. The BMW 518 with 90 horsepower appeared in Europe in the
summer of 1974 as a relatively economically priced entry model to the upper medium category.

In 1977, the series was revised in terms of visual details, and the BMW 520 was given a
completely new 6-cylinder short stroke engine with double register downdraft carburetor and
an output of 122 horsepower. The new top model was the BMW 528i with 176 horsepower and
from 1978 with 184 horsepower, the first BMW 5 Series to break through the 200-km/h barrier
(124 mph) - still magical for a sedan in this class at the time. The first E12 5 Series available in
the US was the 3-liter BMW 530i, which came out in the autumn of 1974, made especially for the
US market with its increasingly stringent exhaust gas regulations.

The M 535i was developed by BMW Motorsport GmbH - founded in 1972 - and marked the final
power increase of the first BMW 5 Series in 1979. This car was little changed on the outside
and was powered by a 3.5-liter short stroke engine with 218 horsepower. Unavailable in the
US, it was fitted in Europe with a 5-speed sports transmission. Only 1,410 units of the M 535i
were produced: it was the first model of the category of automobiles derived from serial
production models - a category which has remained a tradition to this day.

With this first generation of the 5 Series, which came to the end of its lifecycle in 1982, BMW
was able to more than double production of automobiles in this class, with over half of all 5
Series being exported. Apart from a small number made between 1972 and 1974 at the Munich
plant, all BMW 5 Series were produced at the new plant in Dingolfing.

Qualitative Lightweight Construction for Lower Weight: The Second
Generation 5 Series (E 28) is Born
BMW had already presented the successor models of the E12 series to the press in the summer
of 1981in Munich. Although it was not entirely recognizable as a completely new automobile at
first sight, it nonetheless reflected a great deal of painstaking work to optimize the body, interior
and technology. By means of 'qualitative lightweight construction' - i.e. improvements in
construction details -and the use of new materials, the weight of the new models was reduced
by 132 to 200 lbs., making the BMW 520i the lightest car of its class. The smoother body and a
slight wedge shape with a raised rear reduced air resistance as compared to the predecessor
model by 12% to 0.385.

This time, BMW immediately put out four models with a broad range of engines: the 518i with 90
horsepower carburetor engine and the three fuel-injected 6-cylinder engines 520i, 525i and 528i
with 125,150 and 184 horsepower respectively. The BMW 520i with a compression ratio
increased to 9.8:1 was regarded as the most economical 6-cylinder of its class. The 528e was
the only 5 Series model offered in the US in 1982, joined by the 533i in 1983. Passive safety
was further improved in the new 5 Series. The completely redesigned interior reduced the risk
of injury by means of new materials and by reducing the sharpness of protruding parts as much
as possible.

Further innovation was provided by a whole range of new electronic systems such as the
service interval display, Energy Control, Check Control and the electronic heater regulation
system. Anti-lock brakes and an on-board computer were optional extras.

The wheel suspension now used the double pivot universal joint strut with angled coil springs
offset to the shock absorber, which had been used in the 7 Series models since 1977. The
well-established transverse link rear axle was completely revised and used for the models 518i,
520i, 525i and 528i in two variations, differing in sweep. All these measures ensured that the
new models were more agile and had greater stability, with at least the same level of comfort.

In 1982 (1983 in Europe), the new 5 Series generation was expanded with an interesting
variation, the 528e. The small "e" in the model designation of the BMW 528e stood for the Greek
letter "eta", the mathematical symbol for the efficiency factor. The aim with this model was to
critically reduce fuel consumption without foregoing characteristic BMW properties such as
superior output and engine comfort. With various measures, which resulted in lower frictional
losses and optimized cylinder charge with air/fuel mixture, this aim was met in the BMW 528e.

BMW 524td: The Diesel Revolution.
A revolutionary decision in the history of BMW was to penetrate the highly competitive market
for diesel automobiles and thus develop a new generation of engines. Finally, in June 1983, the
BMW 524td was presented in Europe (1985 in the US). BMW had faced up to the challenge of
constructing a diesel engine which was to unite the benefits of the diesel principle with
characteristic BMW qualities such as dynamic performance and running smoothness. Thus the
BMW turbodiesel engine was created on the basis of the existing in-line 6-cylinder engines
between 2 and 2.7 liters capacity. With turbocharging and large flow cross sections in the
intake and outlet valves of the 2.4-liter engine; a high output of 115 horsepower was enabled.
The further developed swirl chamber combustion process also offered excellent conditions for
low fuel consumption and combustion noise.

According to DIN norms, BMW achieved a fuel consumption of just 33.1 mpg with this modern
turbodiesel. With a top speed of 112 mph and an acceleration of 13.5 seconds from 0 - 62 mph,
driving performance figures were realized which set new standards in dynamic performance
for diesel automobiles.

A particular highlight of this 5 Series generation from 1984 was the first BMW M5, built in small
series, sold only in Europe until 1988, when it was first offered in the US. With the 286
horsepower 24-valve engine of the BMW M635CSi (256 horsepower in US versions) and a
chassis adapted by BMW Motorsport GmbH to the enormous output, this exclusively fitted
four-door model proved itself to be one of the fastest sedans in the world.

After a production cycle of seven years and a new record with over 722,000 units produced,
this series was replaced by the entirely new vehicles of the third BMW 5 Series generation.

The E 34: A New Dimension
In January 1988, BMW presented a completely new 5 Series, highly sophisticated in every detail.
The larger and much more spacious, strikingly wedge-shaped body not only provided more
interior space but also achieved a much improved air resistance figure of 0.30 - 0.32 depending
on the model

Under its body, the chassis derived from the 7 Series with double tube gas shock absorbers,
double pivot universal joint strut front axle and precision arm rear axle had a positive effect.
Larger brake discs matched the higher output levels of the engines.

In terms of passive safety, the vehicle front structure was designed to exceed the requirements
of the stringent US safety norms: up to an impact speed of 35 mph, the passenger cell largely
retained its shape.

For the first time in the history of the medium BMW series, the series was launched only with
6-cylinder engines, with the spectrum ranging initially from the European 524td with 115
horsepower to the 535i with 218 horsepower, but other variations were quickly developed. It
started in the summer of 1988 with the new M5 with a 315 horsepower 4-valve high
performance engine with Bosch Motronic, from 1992 tuned up to 340 horsepower with a longer
stroke and higher compression. From 1994, the M5 was even available with a newly developed
6-speed transmission and also in a touring (Sports Wagon) version. In 1991, a more powerful
European turbodiesel version appeared with 2.5-liters capacity, charge air-cooling and 143
horsepower.

From the model year 1986 in the US and 1992 for the rest of the world, BMW fitted all
automobiles as standard with ABS. With the new 525iX, permanent all-wheel drive, which had
seen its debut in 1985 in the 3 Series, was now available in Europe in the upper middle category
too. The introduction of Wagon models to this class was completely new - with BMW using the
designation 'touring'. On request, these models could also be ordered with a special variable
double slide/tilt roof.

One year later, the standard of this series was significantly raised with the option of two V8
engines from the BMW 7 Series. These completely new engines made of light alloy and with
three or four liters capacity, 4-valve technology and 218 and 286 horsepower respectively
guaranteed outstanding output potential with maximum running smoothness and comparatively
low fuel consumption.
With over 1.3 million units produced, this model series became one of the outstanding success
stories in the history of BMW automobiles.
With Light Alloy Suspension: The E 39.

In 1995 the fourth 5 Series generation had its debut at the Frankfurt Auto Show. The sedan had
grown in every dimension and showed a unique level of static and dynamic torsional stiffness
within its class. A particular highlight of the new series was the suspension, however: this 5
Series was the world's first large-scale serial production automobile to have was the
suspension made almost entirely of light alloy. In order to convert the reduced weight effectively
into optimum driving response, the front axle was for the first time a combination of front
rack-and-pinion steering and double pivot universal joint axle with tension struts. The patented
integral rear axle was optionally available with a new pneumatic suspension.

For the first time in the history of the 5 Series, BMW no longer offered a 4-cylinder version with
the exception of the 520d from 1999. In the US, a 6-cylinder 528i and a V8-powered 540i were
offered as of the 1997 model year. (There were no 1996 model year 5 Series offered in the US.)
From the beginning, the 6-cylinder gasoline and diesel engines were used, at the end of 1996
there followed the two V8 engines in Europe. The top model came out in 1999 (1998 in Europe):
the new M5, with the most powerful serial production BMW engine of all times. Among other
things, the 5-liter power unit with 400 horsepower has oil supply with centrifugal control and
electronically controlled individual throttle valves. For the first time, BMW used a tire pressure
warning system in this high-performance vehicle.

In 1997, BMW offered the 540i Protection model - the first standard light armored security car in
Germany. The sedan was protected with aramid and armored glass against small arms and
weighed only 365 lbs. more than the standard version. In the same year, numerous 5 Series
variations were available in the popular touring version.

This much is certain: this BMW 5 Series will once more have set a new production record with
over 1.4 million vehicles - in spite of tougher competition - when the successor generation
shortly lines up for the start. All in all, BMW has created for itself a crucially successful pillar of
company success with the 5 Series. In the sum of its qualities, the middle BMW series has
always set standards. From 2003, the innovative new generation of 5 Series models, the E60,
will continue this tradition as successfully.
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  #2  
Old 06-24-2003, 06:50 PM
JEM JEM is offline
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Yeah, the mid '90s were so spotty for BMW in the US that they actually did without a 5-series for a year.

How times have changed - if they did something like that now, the dealer body would go after BMW AG with knives drawn.
  #3  
Old 06-24-2003, 10:20 PM
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Jimmy540i.com Jimmy540i.com is offline
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thanks
  #4  
Old 06-24-2003, 10:30 PM
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Jon Shafer Jon Shafer is offline
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Quote:
Originally posted by JEM
Yeah, the mid '90s were so spotty for BMW in the US that they actually did without a 5-series for a year.

Well, it wasn't like that exactly. When I started with BMW in 1995
we had an I-6 525i, a V-8 530i (yes, a 3 liter V-8), and a V-8 540i.
If I can recall correctly, there were Touring Wagon versions of
all 3. The E39 5 Series launched as a 1997 model in the summer
of 1996. The Olympics were a big part of the promotion.

They extended the production run of the previous 5 Series
a few extra months. There was even a super-rare limited
edition "Olympic Package" on the 525i, right before the E39
528i was launched.
  #5  
Old 06-24-2003, 10:38 PM
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SONET SONET is offline
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Good read, thanks for posting it.

--SONET
  #6  
Old 08-17-2006, 08:46 PM
V_RocKs V_RocKs is offline
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Always a history buff, thanks for posting!
 

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