Austin-Healey 100-6

{{Use British English|date=June 2017}}

{{Use dmy dates|date=June 2017}}

{{Infobox automobile

| name = Austin-Healey 100-6

| image = austin-healey 100-6 bn4 vyy420 arp.jpg

| production = 1956–1959

| manufacturer = Austin-Healey (BMC)

| wheelbase = {{convert|92|in|mm|0|abbr=on}}{{cite book |last=Culshaw |author2=Horrobin |title=Complete Catalogue of British Cars |year=1974 |publisher=Macmillan |location=London |isbn=0-333-16689-2}}

| length = {{convert|157.5|in|mm|0|abbr=on}}

| width = {{convert|60|in|mm|0|abbr=on}}

| height = {{convert|50|in|mm|0|abbr=on}}

| predecessor = Austin-Healey 100

| successor = Austin-Healey 3000

| assembly = Abingdon, England
Longbridge, England

| engine = 2639 cc C-Series I6

}}

The Austin-Healey 100-6 is a two-seat roadster that was announced in late September 1956{{cite news | title=New Austin-Healey Sports Car | newspaper=The Times | date=28 September 1956 | page=5 | issue=53648}} and produced from 1956 until 1959. A replacement for the Austin-Healey 100, it was followed by the Austin-Healey 3000; together, the three models have become known as the Big Healeys.

The 100-6 featured a {{convert|2|in|mm|1|abbr=on}} longer wheelbase than the 100, a more powerful straight-six engine in place of its slightly larger inline-four, and added two occasional seats (which later became optional). The body lines were slightly streamlined, a smaller, wider radiator grille placed lower, an air scoop was added to the bonnet, and the windscreen fixed.

The 100-6 was produced in two model designators, the 2+2 BN4 from 1956 onwards and the 2-seat BN6 in 1958–9.

The cars used a tuned version of the BMC C-Series engine previously fitted to the Austin Westminster, initially producing {{convert|102|bhp|abbr=on}} and increased in 1957 to {{convert|117|bhp|abbr=on}} by fitting a revised manifold and cylinder head.{{cite book |last=Robson |first=G. |title=A-Z of British Cars 1945-1980 |year=2006 |publisher=Herridge Books |location=Devon, UK |isbn=0-9541063-9-3 |url-access=registration |url=https://archive.org/details/azbritishcars1940000robs }} The previously standard overdrive unit was made optional.

In late 1957 production was transferred from Longbridge to the MG plant at Abingdon. 14,436 100-6s were produced before production ended in 1959.

A {{convert|117|bhp|abbr=on}} BN6 was tested by The Motor magazine in 1959 had a top speed of {{convert|103.9|mph|km/h|abbr=on}} and could accelerate from 0-{{convert|60|mph|km/h|abbr=on}} in 10.7 seconds. A fuel consumption of {{convert|20.8|mpgimp|L/100 km mpgus}} was recorded. The test car cost £1307 including taxes of £436.{{cite journal |title = The Austin-Healey 100-Six Two-seater| journal =The Motor| date = 8 April 1959}}