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Homepage. This page: Identify the correct spark plug to use in 1950's/1960's car engines.
Vintage & classic car reference section

AC Spark Plugs.

Applications list for AC plugs
This AC spark plug application chart was acquired, by person(s) unknown, at the 1959 Earl's Court Motor Show, according to a pencil-written note on one of its sides. Presumably it was destined for maybe a small garage, or the workshops of a vehicle operator, with the intention of them requesting AC plugs whenever a change was due. In addition to the application chart, two sides of the leaflet are given over to photographs of plugs that demonstrate a range of engine conditions and maladies. Tips were given on how to correct the faults, and the information given is as relevant now as it was then, for anyone who has a car from this era. Hopefully someone will find this fault-finder-cum-application-chart of interest, and maybe even a little use. Elsewhere on OCC there is a leaflet describing AC "Plugpaks", which were boxed sets of plugs designed with garages and trade sellers in mind. It can be found here.
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AC "Hot Tip" Spark Plugs.

  • Published by AC.
  • Date: 1959.

AC spark plugs application chart 1

Spark plug application chart.

Car manufacturers listed are as follows: Armstrong-Siddeley, Austin, Bentley, Citroen, Daimler, Fiat, Ford (England), Hillman, Humber, Jaguar, MG, Morris, Renault, Riley, Rolls-Royce, Rover, Standard, Triumph, Vauxhall and Wolseley.
AC spark plugs application chart 2

Spark plug fault finder & diagnosis.

Spark plug condition guide
Fault finder

Please note.

Information presented in this section is provided as an aid to classic and vintage car owners only. It shouldn't necessarily be taken as gospel, more of a useful series of pointers. It may be that since these period instructions were created, better ways have since evolved to tackle work on the components being considered. Tips and advice may be given in these period articles, but inclusion doesn't necessarily suggest that anyone involved with OCC endorses the methods portrayed. A certain level of mechanical know-how will be required in undertaking work as described in these pages, and anyone unsure of their own abilities is advised to seek further assistance. Delve into your car's inner workings only if you feel confident in your own abilities, after all - a little knowledge can be dangerous, as the old saying goes.
No-one at OCC can be held responsible for breakages and injuries that might occur, while working on a vehicle following a read of pages hosted on the site. Dabble at your own risk. Where possible, the source(s) for the data shown will be given. If the accreditations are incorrect, or contravene your copyright, please let me know.
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