Mk I Mini

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1963 Mk I Austin Mini Super-Deluxe

The Mk I Mini (1959–1967) was the first version of British Motor Corporation's Mini. It is characterised by its sliding windows, external door hinges and 'moustache' grill. In England the Mk I was produced between 1959 and 1967.

[edit] Design

A cutaway model of what appears to be an early Mini with hydroelastic suspension.

Designed as project ADO15 (Austin Design Office), the first models were marketed with the names Austin Seven (often written as SE7EN) and Morris Mini-Minor in England. Until 1962, they appeared as the Austin 850 and Morris 850 in export markets. The production model differed from the original prototype (affectionately named "The Orange Box") due to the addition of a front subframe, on which the engine was mounted, and by the engine being mounted with the carburettor at the back, rather than at the front, as in the prototype, due to carburettor icing.

The proposed engine size was originally 950cc. However, Leonard Lord, chairman of BMC thought that the 90mph top speed was excessive and thus reduced the engine size to 848cc to gain a more manageable speed (for the time) of 72 mph. Issigonis' suspension featured the use of rubber cones as springs: the spring rate of rubber changes with compression, allowing the suspension to adapt to passenger load variations (a full passenger load could actually double the tiny vehicle's gross weight). A conventional suspension would have required an increase in height to the design. This unique design was adapted from Issigonis's home-built racer and built for the Mini by Alex Moulton.

The Mini was a genuine four seater. This was possible within such a small bodyshell because the engine was mounted transversely, driving the front wheels via a gearbox which was uniquely incorporated into the sump of the engine. Engine and gearbox thus shared the same oil, which was a significant piece of design in response to the 1953 Suez crisis and the fears of future oil shortages. The overall width of the vehicle was reduced, because there was no need to accommodate a separate gearbox across the width of the car and because there was no transmission tunnel in the floorplan of the Mini, there was more space that could be used to accommodate the passengers thus compensating for the reduced width. Overall length was minimized because of the Mini's two-box design, comprising only a passenger compartment and the engine compartment. There was no third box providing a separate luggage compartment (i.e. a boot) and that inevitably compromised luggage space. To offset that problem, large bins beside each of the four seats provided some useful interior storage and a centrally located instrument binnacle allowed the dashboard to be opened up for storage too. The requirement for storage bins in the front doors effectively determined that the Mini should have sliding windows rather than wind-up windows. The tiny 10 inch wheels helped to reduce the intrusion of wheel arches into the interior of the vehicle and allowed a modest amount of additional luggage space in a "boot" area behind the rear seats. Overall the Mini represents some very clever packaging which has often been imitated but has never been bettered.

[edit] Cooper and Cooper S

1964 Cooper S at the 2004 Watkins Glen SVRA

Issigonis' friend John Cooper, owner of the Cooper Car Company and Formula 1 Champion and rally driver in 1959 and 1960, saw the potential of the little car, and after some experimentation and testing, the two men collaborated to create a nimble, economical, and inexpensive car. The Austin Mini Cooper and Morris Mini Cooper debuted in September 1961.

The original 848cc engine from the Morris Mini-Minor was increased to 997 cc, boosting power from 34 bhp to 55 bhp (25 to 41 kW). The car featured a racing-tuned engine, double SU carburetors, and disc brakes, uncommon at the time in a small car. 1,000 of this iteration were commissioned by management, intended for, and designed to meet the homologation rules of, Group 2 rally racing. The 997 engine was replaced by a shorter stroke 998 cc unit in 1964. By the time production of the Cooper model ended in 1967, 12,274 of these popular cars had been sold to the public. A more powerful Mini Cooper, dubbed the "S", was developed in tandem and released in 1963. Featuring a 1071 cc engine and larger disc brakes, 4,030 Cooper S's were produced and sold until the 1071 model was deleted in August, 1964. Cooper also produced two models specifically for circuit racing, rated at 970cc and a 1275cc, both of which were also offered to the public. The smaller engine model was not well received and only 961 were built with 970cc engines until the model was discontinued in April 1965.

[edit] Upgrades

An Almond Green Mk I Morris Mini Minor

The suspension in all UK models was replaced by a Hydrolastic system in 1964. The new suspension created a softer ride, but it also increased weight and production cost; in 1969 the original rubber suspension reappeared except on 1275 GT, Clubman and Cooper S models. Many other production changes occurred over the life of the Mk I Mini.

In Australia, 1965 saw the release of the redesigned Australian Morris Mini Deluxe. The new model featured redesigned doors with conventional interior handles and wind up windows (with quarter vents), hydrolastic suspension, key operated starter, a remote gearshift mechanism (like the Cooper) and the engine was upgraded to the 998cc version. Producation of the Australian Morris Mini Deluxe continued until 1969 when it was replaced with another Australian only model, the Mini K the "K" stands for Kangaroo. The K received the more powerful 1098cc engine (from the Morris 1100) as well as 4 speed syncro and upgraded instruments. It was claimed that the Mini K was produced with 80% local content. Both of the Australia only round-nosed minis were based on the UK Mk I Mini with the production changes from the Mk II Mini never being used in Australia. Production of the roundnose mini in Australia halted in 1970 with the release of the new Mini Clubman. The Australian Mini Clubman utilised the same locally designed wind up windows and exterior door hinges as the Morris Mini Deluxe. The Australian Mini had wind up windows many years before their British counterparts.

[edit] Mk I Mini production changes for UK built cars

Chassis numbers for production changes are given in italics, where necessary in the format Austin/Morris

[edit] 1959

An eager family buys the first Morris Mini-Minor sold in Arlington Texas. The uniquely designed car was met with widespread public acceptance.

• 26/08/1959 - 101 - The first Mini launched, the Austin Seven and Morris Mini-Minor
• August - 4232/4093 - Split radiator cowl
• August - 5488/5537 - Pivoting quadrant on radius arm for handbrake cable
• August - 10151/11670 - Castor angle changed from 1.5 to 3 degrees
• December - Interior trim changes for the Austin Seven

[edit] 1960

• January - 10502 - Modified window catches
• February - 14215 - Morris Only. Improved trim, Improved dampers, fuel tank drain plug, modified window catches
• March - 19126 - First Countryman
• April - 26590/24831 - Drive shafts modified
• May - Mini van announced
• September - 19101 - Wood framing available on Countryman/Traveller
• October - 58698 - Austin Seven upgraded to Feb Morris spec
• Late 1960 - Recessed panels around front and rear screens introduced

[edit] 1961

• Sep 1961 - Mini Cooper launched
• Late 1961 - Rivitted wheels replaced with welded

[edit] 1962

• 01/01/1962 - Austin Seven rebadged Austin Mini, metal oil filler cap replaced with plastic

[edit] 1963

• May 1963 - Chrome window catches and 10 hole runners replaced with plastic catches and 2 hole runners
• June 1963 - Upper seat belt mounts in the B-pillar lowered 4.5"

[edit] 1964

• Jul 1964 - 'Cutout' front panel added
• Sep 1964 - Courtesy light switches added to A-panel
• Sep 1964 - Hydrolastic suspension introduced
• Oct 1964 - Seat mounting brackets gained 3-point adjustments

[edit] 1965

• Oct 1965 - AP (Automotive Products) four-speed automatic transmission available as an option.

[edit] 1966

• Jan 1966 - Safety boss added to external door handles

[edit] 1967

• Oct 1967 - Mk I replaced by Mk II

[edit] Production date stamps

A typical datestamped component (circled)

The wiper motor is the easiest to date

Certain components fitted to Mk I cars were stamped with the date on which they were made. This is in the format of week/year, like 1/62 for the first week of 1962. These dates can be useful for working out the age of a specific car, or for judging how original it is. The following components are known to be date stamped in this manner:

[edit] See also

• Mini - For details of this and other Mini models

[edit] External links

• http://www.specialistminiforums.com/