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 an ignition coil with reversed primary connections to reduce plug voltage.
| Identifier | ExFiles\Box 164\5\ img295 | |
| Date | 17th June 1937 | |
| RR 755B (10H) 88620 12-8-35 W.H.K. 21800 COMPLETED 23.8.37. BENTLEY STANDARDISATION OF PARTS. Date 17.6.37 Drawing No. X No. 6013. Description of Parts: IGNITION COIL WITH REVERSED PRIMARY CONNECTIONS. Origin: To reduce plug voltage. Report of Experimental Test. Tests on Exptl. Phantom III cars shew that misfiring which occurs when the plug gaps erode beyond a certain amount can be improved by reversing the coil polarity. There is no electrical difference in the coil from an insulation point of view warrenting endurance tests. MATERIAL: £ s. d.{John DeLooze - Company Secretary} LABOUR: £ s. d.{John DeLooze - Company Secretary} CHARGES: £ s. d.{John DeLooze - Company Secretary} TOTAL: £ s. d.{John DeLooze - Company Secretary} Cost of Old Part Cost of New Part Nett Increase: No Difference Signature from Cost Dept. that above is correct. G/RL 28.7.37. INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 20-8-37 | Agreed Sg.{Arthur F. Sidgreaves - MD} WGR.HS{Lord Ernest Hives - Chair} | 6.8.37. | Agreed Hs.{Lord Ernest Hives - Chair} C. | 6.8.37. | Agreed C. DA.{Bernard Day - Chassis Design} | 12.8.37. | Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 3.8.37. | Agreed By.{R.W. Bailey - Chief Engineer} SET.RHC{R. H. Coverley - Production Engineer} | 3.8.37. | Agreed RHC.{R. H. Coverley - Production Engineer} MX.{John H Maddocks - Chief Proving Officer} | 2.8.37. | Agreed Mx.{John H Maddocks - Chief Proving Officer} HS.{Lord Ernest Hives - Chair} Rm{William Robotham - Chief Engineer} | 2.8.37. | Agreed Hs.{Lord Ernest Hives - Chair} STAMP: C.A.C.U. 14 AUG 1937 | ||