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 HD.3 spark plugs for 5.0 & 5.25 compression ratio engines to prevent pre-ignition.
| Identifier | ExFiles\Box 162\6\ img183 | |
| Date | 12th August 1932 | |
| RR 755 (10M) (30405. 21-4-32) BM. 3/5362/4. X4435. COMPLETED 30.9.32. STANDARDISATION of CHASSIS PARTS. Date 12.8.32 Description of Parts. LODGE PLUGS TYPE HD.{Mr Hayward/Mr Huddy}3 FOR 5. & 5.25 COMPRESSION RATIO. Origin. To prevent preignition on high comp. engines. X No. 4425 No. 7970 Drawing No. Part List Experimental Test Report. A series of plugs have been tested for the above, and the Lodge HD.{Mr Hayward/Mr Huddy}3 type were the most satisfactory. Road Test Report. Fitted to 19-EX and ran 10,000 miles in France. There has been no sign of preignition throughout the tests. Mag. setting .020", Coil .025", gave the best results. Weight of Old Part. Cost of Old Part. £ - Weight of New Part. Cost of New Part. £ - Difference per Car. Difference per Car. £ - none Signature from Cost Dept. that above is correct. ARL 28/9/32. GS 29/9/32. Cost of Parts in Works which will be scrapped if commenced on:- Series.........£....... Series.........£....... Series.........£....... INITIAL, DATE, REMARKS SG.{Arthur F. Sidgreaves - MD}, 29-9-32, Agreed SG.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce}, 20.8.32, Agreed FHR. WOR.{Arthur Wormald - General Works Manager}, 15.8.32, Agreed Wor.{Arthur Wormald - General Works Manager} C., 15.8.32, Agreed C. RG.{Mr Rowledge}, 16.8.32, Agreed Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design}, 18.8.32, Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer}, 16.8.32, Agreed BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer}, 15.8.32, Agreed EP.{G. Eric Platford - Chief Quality Engineer} (Assume misfires and oxidizing as reported now OK at .020" gap.) AP E.{Mr Elliott - Chief Engineer}, 19.8.32, Agreed AE. PN.{Mr Northey}, 31.8.32, Agreed PN.{Mr Northey} Hs.{Lord Ernest Hives - Chair}, , Agreed Hs.{Lord Ernest Hives - Chair} [STAMP: PLANT] [STAMP: RECEIVED 29 SEP 1932] | ||