Editing Engine tuning (section)

==History==
{{expand section|date=May 2024}}
[[Image:Igniscope Ignition Tester 1.jpg|thumb|right|'Igniscope' ignition tester, with display tube and outer case missing]]

Modern engine tuning was spawned by the combination of racing advances, the hands-on post-war [[hot-rod]] movement, and then-advanced electronics and technologies developed during World War II. 

===Tools===
The 'Igniscope' electronic ignition tester was produced by [[English Electric]] during the 1940s, originally as 'type UED' for military use during [[World War II]].<ref>Instruction manuals published by The English Electric Company Ltd., Industrial Electronics Department, Stafford.</ref> The post-war version, the 'type ZWA' electronic ignition tester, was advertised as "the first of its kind, employing an entirely new technique".<ref>Advertising brochure, page 2</ref>

The Igniscope used a [[cathode-ray tube]], giving an entirely visual method of diagnosis. It was invented by [[D. Napier & Son]], a subsidiary of English Electric.<ref>Edit by Mr. J. B. Roberts, May 1948, to note on page 7 of the brochure for the Model ZWA</ref> The Igniscope was capable of diagnosing latent and actual faults in both [[Ignition coil|coil]] and [[ignition magneto|magneto]] ignition systems, including poor battery supply bonding, points and condenser problems, distributor failure and spark-plug gap.<ref>Early military and later commercial instruction manuals</ref> One feature was a "loading" control that made latent faults more visible.

The UED manual includes the spark plug [[firing order]] of tanks and cars used by the British armed forces.<ref>Manual for the "Igniscope" UED tester, Appendix 1</ref>