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).
Test results of various spark plugs under compression pressure at different magneto speeds.
| Identifier | ExFiles\Box 34\3\ Scan005 | |
| Date | 1st March 1918 | |
| X.2635 Particulars of test of Plugs with compression pressure. Test made after plugs had been run for approximately 20 miles in an engine. X.2514. Abbreviations:- M.F. - Misfires at C.F. - Cease fires at S.C. - Short circuits in plug after this pressure. F.{Mr Friese} - Fails without pressure. Magneto speed 300 R.P.M. Magneto speed 3000 R.P.M. Plug Nos. X.2635. Bosch. X.3641. H.S.C. X.1918. K.L.G. Bosch. H.S.C. K.L.G. 1. M.F. 120 lbs C.F. 150 " M.F. 80 lbs S.C. M.F. 95lbs S.C. M.F.150 lbs C.F.180 " M.F. 80 lbs S.C. M.F. 90lbs S.C. 2. M.F. 140 " C.F. 160 " M.F. 80 " C.F.100 " M.F.100 " S.C. M.F.150 " C.F.175 " M.F. 90 " C.F.120 " M.F.100 " S.C. 3. M.F. 70 " C.F. 85 " M.F. 90 " S.C. M.F. 30 " S.C. M.F. 90 " C.F.110 2 M.F. 90 " S.C. M.F. 50 " S.C. 4. M.F.100 " C.F.230 " M.F.100 " C.F.120 " M.F. 30 " S.C. M.F.210 " C.F.240 " M.F.125 " S.C.135 " M.F. 50" S.C. 5. M.F.130 " C.F.150 " F.{Mr Friese} F.{Mr Friese} M.F.140 " C.F.175 " F.{Mr Friese} F.{Mr Friese} 6. M.F.130 " C.F.155 " M.F.120 " C.F.140 " M.F.100 " S.C. M.F.140 C2 C.F.160 " M.F.135 " C.F.150 " M.F.100" S.C. 7. M.F.160 " C.F.190 " M.F. 80 " S.C. M.F.170 " C.F.200 " M.F. 80" S.C. 8. M.F. 70 " C.F. 85 " F.{Mr Friese} M.F.100 " C.F.120 " F.{Mr Friese} 9. M.F.120 " C.F.140 " M.F. 70 " S.C. M.F.140 " C.F.160 " M.F. 70" S.C. 10. M.F.200 " C.F.220 " M.F. 40 " S.C. M.F.230 " C.F.250 2 M.F. 40" S.C. 11. M.F.100 " C.F.120 " M.F. 40 " S.C. M.F.110 " C.F.135 " M.F. 45" S.C. 12. M.F.260 " C.F.280 " M.F. 30 " S.C. M.F.300 " C.F.325 " M.F. 30" S.C. Hm.{Capt. W. Hallam - Head Repairs} | ||