BMW Isetta




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Manufacturer Iso Autoveicoli
Production Iso Isetta (1953-1956)
BMW Isetta (1955-1962)
VELAM Isetta (1955-1958)
Romi-Isetta (1956-1961)
Layout RR layout

The Isetta is an Italian-designed microcar built in a number of different countries, including SpainBelgiumFranceBrazilGermany, and the United Kingdom. Produced in the post-World War II years, a time when cheap short-distance transportation was most needed, it became one of the most successful and influentialcity cars ever created. Because of its egg shape and bubble-like windows, it became known as a bubble car, a name later given to other similar vehicles, including the AMC Pacer.

The BMW Isetta was in 1955 the world’s first mass-production 3-Liters/100km car.[note 1] It was the top-selling single cylinder car in the world, with 161,728 units sold.[1]



[edit]Iso Isetta (Italy)

Iso Isetta
Manufacturer Iso Autoveicoli
Production Iso Isetta (1953-1956)
Body style Cabriolet
Layout RR layout
Designer Ermenegildo Preti

The car originated with the Italian firm of Iso SpA. In the early 1950s the company was building refrigerators, motor scooters and small three-wheeled trucks. Iso’s owner, Renzo Rivolta, decided he would like to build a small car for mass distribution. By 1952 the engineers Ermenegildo Preti and Pierluigi Raggi had designed a small car that used the scooter engine and named it Isetta—an Italian diminutive meaning little ISO.

The Isetta caused a sensation when it was introduced to the motoring press in Turin in November 1953, it was unlike anything seen before. Small (only 2.29 m (7.5 ft) long by 1.37 m (4.5 ft) wide) and egg-shaped, with bubble-type windows, the entire front end of the car hinged outwards to allow entry. In the event of a crash, the driver and passenger were to exit through the canvas sunroof. The steering wheel and instrument panel swung out with the single door, as this made access to the single bench seat simpler. The seat provided reasonable comfort for two occupants, and perhaps a small child. Behind the seat was a large parcel shelf with a spare wheel located below. A heater was optional, and ventilation was provided by opening the fabric sunroof.

Power came from a 236 cm3 (14.4 cu in), 7.1 kW (9.5 hp) two-cylinder two-stroke motorcycle engine. The engine was started by a combination generator-starter known as Dynastart. A manual gearbox provided four forward speeds and reverse. A chain drive connected the gearbox to a solid rear axle with a pair of closely spaced 25 cm (10 in) rear wheels. The first prototypes had one wheel at the rear; this made the car prone to roll-overs, so they placed two rear wheels 48 cm (19 in) apart from each other.

A 1958 Spanish built Iso Autocarro pick-up truck

This narrow track eliminated the need for a differential. The front axle was a modified version of a Dubonnet independent front suspension. The Isetta took over 30 seconds to reach 50 km/h (31 mph) from rest. Top speed was only about 75 km/h (47 mph). The fuel tank held only 13 litres (3.4 US gal; 2.9 imp gal). However, the Isetta would get somewhere between 50 mpg-imp (5.6 l/100 km; 42 mpg-US) and 70 mpg-imp (4.0 l/100 km; 58 mpg-US) depending on how it was driven.

Two models were offered — the little egg-shaped Turismo with narrow 50 cm (20 in) rear track, and the Autocarro, a commercial version with full-width rear axle. The Autocarro was offered in several body styles, a flatbed pickup, enclosed truck, a tilt-bed, or even a fire engine. The Autocarro was an extremely popular type of vehicle in Italy, and numerous manufacturers produced some variant of the type. Iso had previously produced a motorcycle-type Isocarro. The Iso Autocarrowas larger than most, with its four-wheel layout, conventional rear axle with differential and leaf springs, and a large tubular frame. It was good for a 500 to 600 kg (1,100 to 1,300 lb) load. The name Isetta Autocarro was also used.

In 1954, Iso entered several Isettas in the legendary Mille Miglia where they took the top three spots in the economy classification. Over a distance of 1,600 km (1,000 mi) the drivers achieved an average speed of over 70 km/h (43 mph). In view of its maximum speed, which was just 15 km/h (9 mph) higher, this was an almost incredible figure. However, despite its initial success, the Isetta was beginning to slip in popularity at home. This was mainly due to renewed competition from Fiat with its 500Cmodel.

Renzo Rivolta wanted to concentrate on his new Iso Rivolta sports car, and was extremely interested in doing licencing deals. Plants in Spain and Belgium were already assembling Isettas and Autocarros using Italian made Iso components. BMW began talking with Rivolta in mid-1954 and bought not just a licence but the complete Isetta body tooling as well. Rivolta did not stop with licencing the Isetta to BMW. He negotiated similar deals with companies in France and Brazil.

After constructing some 1,000 units, production of the Italian built cars ceased in 1955, although Iso continued to build the Isetta in Spain until 1958. It is thought that some 4,000 Autocarros were built.

[edit]VELAM Isetta (France)

Velam Isetta in the Musée automobile de Vendée.

In 1954, VELAM acquired a licence from Iso to manufacture a car based on the Isetta. Since Iso had sold the body making equipment to BMW, VELAM developed their own body but used the original Iso engine. The VELAM body was rounder and more egg-like than Iso’s Isetta and was known by the French as the ‘yogurt pot’. Instead of a chassis like the Italian and German versions, there was a sub-frame bolted to the body at the rear, which held the rear tires, engine, and transmission. The front suspension was bolted to the front of the body. The front door was opened by push button instead of a handle, and the speedometer was mounted in the center of the steering wheel.

VELAM started production of the car in 1955 at the old Talbot factory at Suresnes, France and the car was introduced at the 1955 Paris car show. All told, five versions of the car were built: the standard Isetta, a convertible version, a luxury version, a one-off “Sport” version, and a race car. Due to competition from the Renault Dauphine, production ceased in 1958.

[edit]Romi-Isetta (Brazil)

In 1955, Iso licenced the Isetta to Romi, a machine-tool manufacturer headquartered in the city of Santa Bárbara d’Oeste, in the State of São Paulo. The Isetta was chosen because it was considered an ideal vehicle for use in the cities by virtue of its size and economy. Released on September 5, 1956, it was the first car produced in Brazil.

Some 3,000 of the Romi-Isettas were manufactured from 1956 to 1961. They kept the Iso design and used Iso engines until 1958; in 1959 they switched to the BMW 300 cc engines.


[edit]BMW Isetta (Germany)

BMW made the Isetta its own. They redesigned the powerplant around a BMW one-cylinder, four-stroke, 247 cc motorcycle engine which generated 10 kW (13 hp). Although the major elements of the Italian design remained intact, BMW re-engineered much of the car, so much so that none of the parts between a BMW Isetta Moto Coupe and an Iso Isetta are interchangeable. The first BMW Isetta appeared in April 1955.

1955 BMW Isetta 250, BMW Museum,MunichGermany.

In May 1962, three years after launching the conventionally modern-looking BMW 700, BMW ceased production of Isettas. A total of 161,728 units had been built.

[edit]BMW Isetta 250

While it retained the “Bubble Window” styling, it differed from the Italian model in that its headlamps were fixed separately to the sides of the bodywork and it carried the BMW badge below the windscreen. The car was also redesigned to take a modified version of the 250 cc four-stroke engine from the BMW R25/3 motorcycle and the front suspension was changed. The single-cylinder generated 9 kW (12 hp) at 5800 rpm. The crankcase and cylinder were made of cast iron, the cylinder head of aluminium. However, the head was rotated by 180° compared with the motorcycle engine. The twin-bearing crankshaft was also different in the Isetta power unit, being larger and featuring reinforced bearings. One of the reasons for this was the heavy Dynastart unit which combined the dynamo and self-starter. The fuel mixture was provided by a Bing sliding throttle side draft motorcycle carburetor. In addition to further changes of detail, the BMW engineers enlarged the sump for installation in the car and cooled the engine by means of a radial fan and shrouded ducting.

The power train from the four-speed gearbox to the two rear wheels was also unusual: fixed to the gearbox output drive was something called a Hardy disc, which was acardan joint made of rubber. On the other side of it was a cardan shaft, and finally a second Hardy disc, which in turn was located at the entrance to a chain case. A duplex chain running in an oil bath led finally to a rigid shaft, at each end of which were the two rear wheels. Thanks to this elaborate power transfer, the engine-gearbox unit was both free of tension and well soundproofed in its linkage to the rear axle.

In Germany, the Isetta could even be driven with a motorcycle license. The top speed of the Isetta 250 was rated as 85 km/h (53 mph).

The first BMW Isetta rolled off the line in April 1955, and in the next eight months some 10,000 of the “bubblecars” were produced.

[edit]BMW Isetta 300

BMW 300 (Isetta)
BMW 300 (Isetta)
Manufacturer BMW
Also called BMW Isetta
Production 1956-62
161,360 produced[2]
Predecessor BMW 250
Successor BMW 600
Layout RR layout
Engine 298cc cc single cylinder 4-stroke (53 mph (85 km/h) top speed)
Transmission 4 speed manual

In 1956, the government of the Federal Republic of Germany changed the regulations for motor vehicles. Class IV licences issued from that time onward could only be used to operate small motorcycles and could no longer be used to operate motor vehicles with a capacity of less than 250 cc. At the same time, the maximum capacity allowed for the Isetta’s tax category was 300 cc. Class IV licences issued before the change in the regulations were grandfathered and allowed to be used as before.[citation needed]

BMW Isetta 300 interior

BMW Isetta 300 – Sliding Window 4 wheel LHD version

This change in regulations encouraged BMW to revise their Isetta microcars. In October 1956, the Isetta Moto Coupe DeLuxe (sliding-window Isetta) was introduced. The bubble windows were replaced by longer, sliding side windows. The engineers had enlarged the single cylinder to a 72 mm (2.8 in) bore and 73 mm (2.9 in) stroke, which gave adisplacement of exactly 298 cc; at the same time, they raised the compression ratio from 6.8 to 7.0:1. As a result, the engine power output rose to 10 kW (13 hp) at 5200 rpm, and the torque rose to 18.4 N·m (13.6 ft·lbf) at 4600 rpm. The maximum speed remained at 85 km/h (53 mph), yet there was a marked increase in flexibility, chiefly noticeable on gradients.


[edit]BMW 600

BMW Isetta 600: the largest of the BMW Bubble Cars

The BMW 600 was intended as an enlarged Isetta with more power and a more conventional four-wheel configuration.

BMW Isetta 600, showing hinged steering wheel, next to 5’3″ (160cm) boy

The front end of the 600 was virtually unchanged from the Isetta, but the 600’s wheelbase was stretched to accommodate four seats. A conventional rear axle was added. BMW introduced the semi-trailing arm independent suspension on the 600. This suspension would be used on almost every new model for the next four decades. Because of the increased size and weight, the 600 had a more powerful engine than the Isetta. The 600 had the 582 cc twin engine from the R67 motorcycle. Top speed was 103 km/h (64 mph).

In two years, only 34,000 600s were produced, partly due to price competition with the entry-level VW Beetle. In the late 1950s, consumers wanted cars that looked like cars, and they had lost interest in economy models. Sales of the 600 were, however, aided by the energy crisis of 1956–1957.

[edit]BMW Isetta (United Kingdom)

British registered LHD 3 wheeled Isetta

With space for two and their luggage, the Isetta was perfect for the UK’s urban and rural roads. The first motorway, the M1, did not open until 1959, and more conventional cars such as early models of the Morris Minor could barely top 97 km/h (60 mph).

At one point, the British National Health Service started providing these vehicles for wheelchair users so they could drive while in their wheelchairs. Although noble in intent and many of these cars were made available free, the project was not deemed successful and was terminated.

In 1957, Isetta of Great Britain began producing Isetta 300 models at their factory in the former Brighton railway works under licence from BMW. The factory had no access by road, with components being delivered by rail, and finished cars being shipped out the same way.[3]

The British cars had right-hand drive with the door hinged from the right hand side of the car and the steering column moved across to the right as well. Right-hand drive meant that the driver AND the engine were on the same side, so a 27 kg (60 lb) counterweight was added to the left side to compensate. Dunlop tyres were used, andLucas electrics replaced the German Hella and Bosch components, with a different headlamp housing being used. Girling brake components replaced the ATE brake parts.

The Isetta was not popular in the UK until a three-wheeled version was introduced, and although three-wheelers were more prone to rolling-over, there was a financial advantage: if the reverse gear was not installed, they could evade automobile legislation and taxation by being classed as three-wheeled motorcycles, and could be driven with a motorcycle licence. Isetta of Great Britain continued to produce four-wheeled Isettas, but only for export to Canada, New Zealand, and Australia.

In 1962, Isetta of Great Britain also stopped production of the little cars but continued to produce Isetta engines until 1964.

[edit]Isetta replica kits

The now defunct British firm Tri-Tech, under the model name “Zetta”, sold a kit car or even an assembled complete BMW Isetta lookalike replica from modern parts, including Honda CN 250 cc single-cylinder water-cooled engines with automatic transmission (standard) or Kawasaki 500 GPS two-cylinder water-cooled motorcycle engines with optional manual transmission.

Some parts, new or used, were from “donor” vehicles. Front suspension and steering were from (General Motors) Bedford (later sold under the Vauxhall name) “Rascal” or the original and almost identical SuzukiSupercarry” light duty van or pick-up trucks. Drum brakes and wheels were from Morris and the subsequent British Leyland Motor Corporation “Mini“. Prices ranged from c. £2650 for the kit up to c. £9450 for a complete version.

It could be legally registered for use under British laws. Tri-Tech also supplied some body parts which can be used for running non-exact restorations of BMW Isettas.

[edit]Motorrad Isetta

A new version [4] of the BMW Motorrad Isetta has been rumoured since 2007. Currently (November 2011), this is thought to be the concept vehicle for the BMW Mega City Vehicle project.[5][6]

[edit]Popular Culture

In the TV series Family Matters, the character of Steve Urkel drove a BMW Isetta.

In the original movie Bedazzled (1967 film), you can see Margaret getting into a Isetta with another man while Stanley (Dudley Moore) sees her off and proceeds to attempt suicide.

In season 1, episode 8 of the TV series American PickersMike Wolfe and Frank Fritz found two Isettas in a large junkyard.

In the science fiction TV series Charlie Jade, episode 17 “Spin”, there is a right hand drive sliding window Isetta driving through the scene in the Blade Runner-esque “alphaverse” at minute 29.

The Depeche Mode video ‘Never Let Me Down’ features an Isetta being driven whilst the follow on video ‘Behind the Wheel’ begins with the car being towed away by a tractor.

BMW Iseta was found in a storage unit in the “Railroad Roulette” episode of the Storage Wars reality TV series.

In Genesis of Aquarion, Tsugumi Rosenmeier is shown driving an Isetta.

In “Weird Al’s” music video Whatever You Like (Parody of “Whatever You Like” by T.I.) after he says “yeah you like my Hyundai” an Isetta is seen driving by.

Guido, a custom forklift in the Pixar/Disney films Cars and Cars 2, resembles an Isetta. This, apparently, is an Italian-built model, since he talks in that language and the few English phrases he employs are markedly accented.

[edit]See also


  1. ^ “Isetta: Ein Auto bewegt die Welt”(Authors = Andy Schwietzer & Manfred Seehusen)
  2. ^ “1957 BMW ISETTA (300)”Lane Motor Museum. Retrieved 2010-06-12.
  3. ^ Robson, Graham (March 2007). Elliott, James. ed. “Anorak’s Corner”. Classic & Sports Car (Teddington, Middlesex, UK: Haymarket Publishing) 25 (12): 226. ISSN 3183 0263 3183.
  4. ^ “”i-Setta” – The next BMW brand” Retrieved 2007-08-04.
  5. ^ “Is this BMW’s Megacity iSetta logo?” Retrieved 2010-12-28.
  6. ^ “The concept for the BMW Mega City vehicle is the iSetta” Retrieved 2010-12-28.
  1. ^ In this context, 3-Liter refers not to engine size but to the fact that its low-friction 1-cylinder engine and low weight gave it a fuel efficiency of 3.3 litres per 100 kilometres (86 mpg-imp; 71 mpg-US)(manufacturer information).

[edit]External links



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