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).
Standardisation of Lodge spark plugs type H.R.3 & C.S.2 for a specific compression ratio.
| Identifier | ExFiles\Box 162\6\ img184 | |
| Date | 12th August 1932 | |
| STANDARDISATION of CHASSIS PARTS. S.C.R/61 Date 12.8.32 Chassis No. X 4259 Drawing No. Part No. Description of Part. LODGE PLUGS TYPE H.R.3 & C.S.2 FOR COMPRESSION RATIO Origin. To prevent misfiring on high comp. engines. Road Test Report. Fitted to G.X-31 and ten others in service. There has been no misfire throughout 10,000 miles on these cars. The best results are obtained. Experimental Test Report. A series of plugs have been tested for the above and the Lodge H.R.3 were the most satisfactory. The number of the first chassis on which the new part will be fitted......... 'O' series. Date when chassis will be handed to test. 15th Oct. 1932 Cost of scrapped material, if any....... Nil. Cost of jigs and tools................ Nil. INITIAL | DATE | REMARKS S.G. | 12-8-32 | P. Passed R | 20.8.32 | Agreed H.H. ROW | 12.8.32 | Agreed. C | 12.8.32 | Agreed. RC{R. Childs} | 12.8.32 | Agreed. AC | 12.8.32 | Agreed. BY | 12.8.32 | Agreed. P.S. | 12.8.32 | (Assemble matters and fix existing as reported NOW OK. No. 080. "G" ser.) E | 12.8.32 | Agreed. PH | 12.8.32 | Agreed. H.S. | | Agreed. | ||