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).
Continued report discussing cracking issues with porcelain spark plugs due to heat expansion.
| Identifier | ExFiles\Box 79\1\ scan0098 | |
| Date | 30th May 1918 | |
| Contd. -2- EH2/LG30.5.18. trouble with porcelain. We have not yet had a porcelain which will stand up to any excessive heat without cracking. We have not given up, because we think that a lot of the trouble is due to the expansion of the porcelain and the way it is held. The "Lodge" people have also made us up several special porcelain plugs but on these we have had trouble with the porcelain breaking. EH. | ||