75 years of the BMW Roadster. The BMW 315/1 and its Successors

Munich. The style has changed, but not the content: "Many German motorists see
motoring not just as a comfortable and fast means of transport, but also as a
sporting activity. These are people who, once they see an aerodynamic car body
with a long and sleek engine compartment, as well as a speedometer extending
all the way to 150 km/h, feel that strong yearning for wide open roads simply
perfect for driving fast, for Alpine passes just begging to be conquered, and
for ompetitors so easy to overtake."

It was precisely with these words that BMW announced the Company's first
self-engineered roadster in 1934. And indeed, this concept with its
six-cylinder power unit was destined to shape the future of the brand,
extending all the way to the current BMW Z4.

The starting point for this development came at the Berlin Motor Show in May
1934. Here, together with the BMW 315 Saloon, BMW for the first time presented
the prototype of a Sports Roadster with exceptionally attractive lines. Right
behind the long and sleek engine compartment there were two sports seats
tailored to the driver and front passenger protected by the low, raked
windscreen and an mergency roof.

The rear end tapered out in an elegant sweep to the back of the car, adding a
particular aerodynamic touch with excellent streamlining.

The radiator grille on this two-seater was inclined much further to the rear
than on the Saloon, with mighty, sweeping front wheel arches extending on
beneath the doors into the rear wheel arches. To reduce air drag to a minimum,
the rear wheels were fully covered, while the body of the car itself rested on
an electrically welded steel-pipe double frame with three crosswise box
elements.

Front suspension was made up of the upper track spring, wishbones further down
and hydraulic lever-type dampers. The rear wheels, in turn, were mounted on a
live axle incorporating semi-elliptic springs and hydraulic lever-type dampers.

Small but hot: six-cylinder power unit displacing 1.2 litres.
Both the saloon and the sports car were powered by the same outstanding engine:
a 1.5-litre straight-six developed out of the 1.2-litre originally featured in
the former BMW 303. The crankcase and cylinder block of this outstanding engine
were made of one single piece, the engine featured one camshaft beneath the
block, with tappets operating the vertical hanging valves aligned in series via
rocker arms. The intake and exhaust pipes, finally, were on the same side.

A feature quite unusual today is the different distances between the individual
cylinders, with the second and third and, respectively, the fourth and fifth
cylinders being further apart, the space in between being used for the
crankshaft and amshaft bearings.

The crankshaft without any counterweights therefore ran in four bearings, just
like the camshaft.

This was however not the reason for this particular design and configuration,
which was rather attributable to the assembly process at the time, with the
crankshaft being completely pre-assembled together with the connecting rods and
pistons. And since the pistons, as a result, had to be inserted from beneath,
the main bearings for the crankshaft had to remain outside of the cylinders,
not extending into their contour lines. As a result, the main bearings had to
be accommodated between cylinders spaced out at a large distance.

While this power unit delivered maximum output of 34 hp on the saloon with its
two carburettors, maximum output of the six-cylinder in the BMW 315/1 sports
model was 40 hp. And the standard of efficiency offered was quite exceptional,
BMW's engineers proudly stating that "this beautiful and fast sports car
consumes only 10-2 litres of fuel on 100 km, with oil consumption between 0.1
and 0.2 kg. So in terms of running costs, it is no more expensive than a small
car far lower down in the market".

With the public simply falling in love with the BMW 315/1, BMW decided to build
the car in a small series - also because the Company wanted to make a more
powerful entry into the prestigious world of motorsport. Starting in summer
1934, therefore, the very attractive BMW 315/1 was retailed at a substantial
5,200.- reichsmarks. The production model differed from the prototype primarily
through the modified arrangement of the headlights and side ventilation grids
taking the place of the bent openings originally featured on the first model.

Outstanding success in motorsport.
Reaching a top speed of 120 km/h or 75 mph, the BMW 315/1 Roadster was one of
the really serious contenders in the sports car market at its time. Indeed, BMW'
s story of success on the race track quickly took on even greater significance
with this new model, the BMW 315/1 achieving its first significant success in
the International 1934 Alpine Rally.

The starter grid for this rally in Nice was made up of 127 truly outstanding
cars looking at daily race sections of 500-600 kilometres to be covered at a
minimum speed. On the fourth day there was an additional speed test at Stilfser
Joch.

After covering precisely 2,867 kilometres or 1,778 miles, 96 of the 127 cars
which had originally entered the race reached the finish line in Munich - 66
thereof without having lost one point. The five cars entered by the BMW Works
Team were the only cars in their class to complete the International Alpine
Trophy without one single penalty point, the BMW 315/1 Team Richard
Brenner/Albert Kandl/Ernst v. Delius finishing first in their category.

Only 230 units of the BMW 315/1 were completed by mid-1935, many of them going
to private drivers. One of them was Ralph Roese, a BMW works driver for many
years, who built himself a BMW 315/1 Special. This was a complete re-build of
the 315/1, the highly modified engine ultimately developing no less than 136 hp
in a brand-new race car body weighing just 380 kg or 838 lb.

Given qualities of this kind, it is no surprise that this racing car finished
first in its very first race at Nürburgring in 1936, a staggering 17 kilometres
ahead of the competition. Understandably, this special model remained a great
success over the years until finally winning the German Road Racing
Championship in 1939.

Achieving this kind of success, both the drivers and the Company soon started
looking for more: a car in the prestigious category up to two litres. And so it
is no surprise that another, even more powerful version of the BMW Roadster -
the 319/1 - entered the market in late 1934. Identical in its looks to the BMW
315/1 with the exception of the air vent on the engine compartment, the BMW
319/1 was powered by a 1.9-litre tuned to 55 hp and benefiting both from larger
displacement and three larger downdraught carburettors.

Obviously, an engine like this was easily able to cope with a two-seater
weighing just 780 kg, accelerating the roadster in standard trim to a top speed
of pproximately 135 km/h or 84 mph. At the same time this was of course a truly
exclusive car due to its retail price of 5,800 reichsmarks. Production from
1934-1936 therefore amounted to just 178 units, with the BMW 319/1 again
bringing home outstanding success in motorsport.

The climax of the pre-war era: the BMW 328 Roadster.
In the mid-30s, production roadsters and competition cars were still very
similar in technical terms - and motorsport was still the ideal place to prove
the performance and reliability of a production car. But to keep up with the
competition, BMW soon had to build cars with more power and muscle. So BMW's
engineers looked for ways and means to significantly increase engine output
without increasing engine size. And they found the solution - the M328, the
engine powering the legendary BMW 328 sports car in 1936.

Right from the start in its debut at Nürburgring on 14 June 1936, BMW's new
roadster literally pulverised even the most powerful supercharged competitors.
This outstanding success was attributable to the well-balanced combination of
superior engine power and cutting-edge suspension technology characteristic of
BMW roadsters to this day: 80 hp in the regular version and low weight of just
830 kg or 1,830 lb gave this elegant roadster superior performance still
impressive today.

With the BMW 328 Roadster initially being restricted to motorsport as of
mid-1936, production of the series model started in spring 1937. And so this
high-performance sports car was driven not only by BMW's works drivers, but
also by private customers since, over and above racing, it was very well suited
for everyday use. And with its top speed of 155 km/h or 96 mph, this was indeed
one of the fastest cars on the road back then.

But again, the BMW 328 Roadster remained a very rare bird, with only 464 units
of this classic roadster being built up to 1940.

Comfort and elegance for all times: the BMW 507.
While the 328 paved the way for BMW's sporting activities, the Company's next
two-seater sports car set new standards in design and elegance as of the
mid-50s: the BMW 507.

When making its debut in New York in 1955 the 507 left both journalists and the
public absolutely spellbound. The long and sleek engine compartment, the
cockpit perfectly tailored to the driver and passenger, the short and muscular
rear end, stretched side lines and gently sweeping curves gave the car
absolutely beautiful, timeless design.

At the same time the 507 came with a brand-new, but nevertheless clear and
impressive BMW face: The double kidney grille was now vertical instead of
horizontal, sweeping elegantly between the headlights across the entire front
end of the car. And the 507 also had a lot to offer within the engine
compartment, boasting an aluminium V8 acknowledged to this day as the first
light-alloy V8 in the world built in series production.

Finished in brilliant red, the sales brochure proudly presenting BMW's new
eight-cylinder sports car promised truly outstanding performance: 150 hp from
3.2 litres and top speed of 220 km/h or 136 mph. And as an option BMW somewhat
later also offered an upgraded version, delivering approximately 165 hp maximum
output.

This truly exclusive car went to exactly 251 proud owners between 1956 and
1959. And not all of them wanted to enjoy this beauty merely as a café cruiser,
racing driver and the "King of Hill-Climbing" Hans Stuck using a modified 507
in mountain races in Europe and winning a number of events in his
eight-cylinder roadster.

A spearhead in technology built for the road: the BMW Z1.
With the roadster coming under increasing criticism in the '60s and '70s in
terms of both safety and comfort, it took 29 years before the next roadster
bearing the white-and-blue logo entered the market. This was the BMW Z1
launched - ahead of its time in technical terms - in 1988.

The body of the Z1 was a steel monocoque made of pressed and welded metal
panels and with its plastic floor bonded into place. The entire outer skin was
made up of plastic elements and panels likewise bolted on to the car, with the
doors retracting on request into the high side-sills even while driving.

The 170-horsepower 2.5-litre straight-six power unit and most of the car's axle
components came from the 3 Series. With the engine being fi tted behind the
front axle, the BMW Z1 was a front mid-engined car, to use the technical term.

Acceleration from a standstill to 100 km/h came in less than eight seconds and
the car's top speed was 225 km/h or 140 mph.

Through its extremely harmonious combination of materials and technologies, the
BMW Z1, weighing just 1,250 kg or 2,756 lb, was a truly dynamic roadster still
thrilling today in terms of stiffness, its low centre of gravity, and stability
in bends. The first units of the car built largely by hand were delivered to
customers as of January 1989, the base price of DM 80,000.- ensuring lasting
exclusivity. Production of the BMW Z1 finally ended in June 1991, after a
production run of exactly 8,000 units.

Sheer driving pleasure in large numbers: the BMW Z3.
The BMW Z1 was the breakthrough. More and more enthusiasts now showed
growing interest in an open BMW two-seater - and in response BMW launched
a roadster in 1995 built in large numbers for customers the world over. Very
soon this compact performer became the epitome of BMW's classic virtues,
offering well-balanced technology within a truly attractive body and with a
clear focus on driving pleasure.

The BMW Z3 entered the market with a choice of two engines. Featuring a
1.8-litre four-cylinder two-valve power unit developing maximum output of 115
hp, the "regular" model accelerated to 100 km/h in 10.5 seconds and reached a
top speed of 194 km/h or 120 mph. The other option was a four-valve 1.9-litre
four-cylinder delivering maximum output of 140 hp for acceleration to 100 km/h
in 9.5 seconds and a top speed of 205 km/h or 127 mph.

With the Z3 proving to be a huge success, BMW was able in the course of time to
offer a whole range of different engines meeting all kinds of different
demands. Ultimately, therefore, the portfolio extended from the original
1.8-litre four-cylinder all the way to the 3.2-litre six-cylinder
high-performance power unit carried over from the BMW M3, delivering up to 325
hp in the M Roadster and giving BMW's compact sports car truly outstanding
performance on the road.

A fascinating milestone in automotive technology: the BMW Z8.
Entering the new millennium, BMW proudly presented a very special new model:
the BMW Z8. With its sleek proportions, classic lines and soft folding roof,
the Z8 was truly one of the most outstanding cars of its time through its looks
alone. Measuring 4.40 metres or 173.2" in length, 1.83 metres or 72.0" in
width, and 1.31 metres or 51.6" in height, this was indeed a modern
interpretation of the former BMW 507.

Like its classic role model, BMW's new roadster offered the very best
technology available at the time in automobile production. Within the outer
skin bolted on to the car, a monocoque aluminium frame, that is spaceframe
technology, provided the load-bearing structure and gave the driver and
passenger an extremely direct feeling of the road and the driving experience.

Within its engine compartment the BMW Z8 featured a high-performance five-litre
V8 sports engine delivering no less than 400 hp. Combined with a manual
six-speed gearbox, this supreme engine enabled the driver to enjoy the utmost
in performance at all times and under all conditions. Indeed, this superiority
translated into equally clear facts and figures, the ambitious driver being
able to lap the 20-km Nord-schleife of Nürburgring in the Z8 in a remarkable
8:15 minutes.

An unmistakable athlete to this day: the BMW Z4.
The latest member of the BMW roadster family is the BMW Z4 presented for the
first time at the Paris Motor Show in September 2002. From the start, this open
two-seater not only marked a further highlight in BMW design language, but also
set new standards in its class. The exciting design of the car was determined
by the highly attractive interplay of convex and concave surfaces, hard edges
and smooth, sweeping curves.

Available from the start with a choice of two high-torque straight-six power
units, the Z4 - either in the guise of the 231-hp Z4 3.0i or as the 192-hp Z4
2.5i - guaranteed roadster motoring at its best.

The outstanding agility of the BMW Z4 is ensured by the car's wide track, an
extremely low centre of gravity, optimum 50:50 axle load distribution, and the
very precise electric power steering. Fading-free high-performance brakes,
runflat tyres featured as standard, and Dynamic Stability Control (DSC III)
with an add-on traction mode finally, guaranteed supreme driving safety under
all conditions.

Style and performance: the new BMW Z4.
The modern interpretation of the classic roadster launched in spring 2009, the
new BMW Z4, combines more power with more style than ever before. Indeed, this
is the only car in its segment to combine classic roadster proportions with the
seating position moved far back close to the rear axle, rear-wheel drive and a
fully automatic retractable hardtop.

The new BMW Z4 offers all the driving pleasure of a BMW roadster in
particularly refined style. Driving with the roof down, this outstanding
two-seater provides a refreshing experience of the sun shining in and the wind
rushing by, with the hardtop closed it ensures the same level of all-round
comfort as a sporting coupé in the premium segment. So through its wide range
of diverse qualities alone, the new BMW Z4 is indeed the re-birth of the
roadster.

Here again, it is certainly appropriate to quote the "BMW Blätter", the
original BMW Leaflets in their description of the BMW 315/1 back in 1934: "In a
nutshell you can describe BMW's new sports car as the fast, beautiful and
reliable car bound to give the ambitious sports driver one exhilarating
experience after the other, at the same time combining all the advantages of an
economical touring car."

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If you have any questions regarding this press release, please contact:
BMW Group
Manfred Grunert
Tel.: +49-89-382-27797
Fax: +49-89-382-23927
e-mail address: manfred.grunert@bmw.de