From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on three different AC short reach spark plugs, detailing their performance and suitability.
| Identifier | ExFiles\Box 162\2\ img012 | |
| Date | 4th August 1950 | |
| AC. AC-K11. Short reach plug as used on Vauxhall "25" Set on 4-8-50 30-G-VII Not sufficient running for report. AC-K9V. Short reach plug as used on Vauxhall "10" Set on 4-8-50 - Removed after 692 miles. Unsuitable for B80 - running too hot. AC-46. Short reach plug obtained for trial on B80. These appear to be running too cool in B80. Slight misfiring on pick up noticed on 33-G-VII after 3,158 miles. | ||