Mark IV and Austin Sprite
Overview
Also called	Austin Sprite
Production	1966–1971
Body and chassis
Related	MG Midget MkIII
Powertrain
Engine	1,275 cc (1.3 L) A-Series I4
Dimensions
Wheelbase	2,032 mm (80.0 in)
Length	3,492 mm (137.5 in)
Width	1,397 mm (55.0 in)

The next upgrade was presented at the London Motor Show in October 1966.

Besides receiving the larger 1275 cc engine (which disappointed enthusiasts by being in a lower state of tune than that of the Mini-Cooper 'S'), the Mark IV and its cousin the Mark III MG Midget had several changes which were more than cosmetic. Most notable is the change from a removable convertible top, which had to be stowed in the boot, to a permanently affixed, folding top of greatly improved design, which was much easier to use. Separate brake and clutch master cylinders were fitted, as car manufacturers' thoughts began to turn to making their products safer. On US market versions the larger engine sacrificed some of its performance from 1968 on, through the use of smog pumps and other modifications to comply with federal emission control requirements. 1969 was the final year the Sprite was exported to the US.

For the 1970 model year cast-alloy wheels were fitted and the grille was changed to resemble that fitted to the MG Midget. 22,790 Mark IV Sprites were made.

Engine:

• 1966–1971: 1275 cc A-Series I4, 65 hp (48 kW) at 6000 rpm and 72 lbf·ft (98 Nm) at 3000 rpm

The Healey connection was discontinued in 1971, so the final 1,022 Sprites built were simply Austin Sprites. This was a cost-cutting move of Donald Stokes', enabling British Leyland to stop paying royalties to the Donald Healey Motor Company. There was no direct successor, as BL's extensive range already contained the MG Midget, which was identical to the Sprite except for badging, and the similarly dimensioned and priced Triumph Spitfire.

Competition

The Sprite (and its MG Midget sibling) have been successful club level race cars since their launch and continue to race in various events to the present day. International events were entered throughout the 1960s and surprisingly good results were achieved, including a 12th-place finish at Le Mans in 1965. The works cars began with use of a commercially available fibreglass-bodied Sprite (with a Falcon body) before utilising lightweight body panels of standard appearance. By the mid-60s, use was made of the wind-tunnel at Longbridge. Barry Bilbie (the chassis designer) utilised the results to produce a streamlined body, built in Birmabright alloy at Healey's Warwick workshops by Bill Buckingham and Terry Westwood. These cars were powered by BMC's Courthouse Green's tuned engines and eventually produced a reliable 110 bhp, which enabled a top speed of around 150 mph on the Mulsanne Straight. One-off gearboxes were also made at Courthouse Green, with MGB gearboxes modified with an externally mounted 5th gear and overdrive in some cases. BMC works entries recorded class wins at Sebring with drivers including Stirling Moss, Bruce McLaren and Steve McQueen, as well as competing in the Targa Florio and Mugello sports car races.

Australian production

Sprites were imported into Australia in completely knocked down (CKD) kit form and assembled by the Pressed Metal Corporation at Enfield, in New South Wales. Models assembled in Australia included the Mk 1, 2, 2A, 3 and 3A.

Innocenti Spider and C Coupé

At the 1960 Turin Auto Show, BMC's Italian partner Innocenti showed an attractive little Spider built upon Sprite underpinnings. The car was the first design of Tom Tjaarda's, drawn for Carrozzeria Ghia. Ghia's partner firm OSI built the bodyshells, when the car entered production in early 1961. The original Innocenti 950 Spider had the Frogeye's 948 cc engine with 43 hp (32 kW), 624 of these were built. Later in 1961 an uprated 46.5 hp (35 kW) was installed. In February 1963 the 1098 cc "S" model was introduced, this also had front disc brakes to cope with the extra power. The 1100 has 58 hp (43 kW) and could also be fitted with a removable hardtop. The Spider wasn't a mere reshelling, as the entire bulkhead was moved forward to provide longer doors and a more modern look. Unlike the spartan Frogeye, the Spider also had wind-up windows and a permanent windscreen. 4,790 of the 950 Spiders were built, and 2,074 of the 1100 cc Spiders.

The Innocenti Spider originally sold well in Italy, with production running at 13 cars per day in 1962, but it had a hard time competing against the cheaper Sprite in export markets. As more modern competitors arrived and as the British-built Sprite was modernised, sales dropped precipitously, with only 63 cars built in 1965. Thus, Innocenti presented the reworked Innocenti Coupé in September 1966, still with the same 1100 engine as seen in late Spiders. The badging on the car simply read "Innocenti C". The Coupé's all-new bodywork was wider and longer than the Spider's, and the wheelbase was extended by 150 mm to 2,180 mm (85.8 in). The floorpan was reworked to allow for the seats to be mounted lower than in a Sprite, making the cabin less cramped. It was competitively priced in the Italian market, slotting nicely between the smaller Fiat 850 Coupé and the bigger Fiat 124 Sport Spider. Only 794 were built when production ended in 1968.

Lenham GT Coupe

The Lenham Motor Company of Kent, founded in 1960, was, and still is, one of the once many "cottage industry" automotive companies providing specialist conversions based upon commercial brand platforms. Best known for its Spridget coupé conversions and the big-Healey based Lenham Healey (a replica of the Healey Silverstone), the firm also produced hard-tops for Jaguar E-types, Triumphs, the Jensen-Healey, the Lotus Elan and for the MGB.

Tifosi Rana Frogeye Replica

The Tifosi Rana Frogeye Sprite replica retains a significant amount of the character and appeal of the original version by using the MG Midget as its basis. As the MG Midget traces its roots directly back to the original Austin Healey ‘Frogeye’, the Tifosi replica perhaps merits the sobriquet "Spridget" even more than the originals. They are supplied and/or built by Halls Garage near Bourne in Lincolnshire, home of the now defunct BRM Formula 1 racing cars.

The Tifosi Rana replica has a fibreglass body with upgrades such as external door handles and wind-up windows as standard. A "Custom package" allows a purchaser to specify various choices of engine, transmission suspension, paint and trim.

UK 50th anniversary celebration

On 24 May 2008, the official UK golden anniversary of the introduction of the Austin Healey Sprite, "Spridget 50 – The Big Party" was held at the British Heritage Motor Centre at Gaydon, Warwickshire. Up to 1000 Sprites, Midgets and derivatives were in attendance – a record number. The event was jointly organised and promoted by the UK's Midget and Sprite Club, Healey Drivers Club, MG Owners Club, Austin Healey Club and MG Car Club – the first time an event of this size has been supported by all of the marque-representing clubs.