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).
Extract detailing the performance and reliability of American Bosch ZR-6 magnetos on pre-war and post-war cars.
| Identifier | ExFiles\Box 172\3\ img043 | |
| Date | 5th March 1921 | |
| Extract from CY3/G 5.3.21. ---- American Bosch ZR6 Magnetos have been fitted to 5 or 6 pre-war cars and have given complete satisfaction This represents a total mileage of over one hundred thousand miles at the least. We have fitted one post-war car with American Bosch ZR.-6, which was last seen after running with this machine for about a thousand miles. It was quite satisfactory. In addition, about ten post-war customers have removed the Watford and fitted American Bosch at their own expense, which represents a mileage of about twenty thousand. All report complete satisfaction. We therefore feel that the American Bosch ZR-6 has been well tried out on post-war cars. OY. | ||