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 report on the compression pressure performance of various spark plugs after a 20-mile run.
| Identifier | ExFiles\Box 58\3\ Scan014 | |
| Date | 28th May 1919 | |
| R.R. 63 (100 T) (S.F. 69a. 28-5-19.) Bm. 2/322/2a. X1918e X3641 X2514 2 Particulars of test of Plugs with compression pressure. Test made after plugs had been run for approximately 20 miles in an engine. 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 Magneto Speed 300 R.P.M. 3000 R.P.M. Plug Nos. Bosch. H.S.C. K.L.G. Bosch. H.S.C. K.L.G. 1. M.F.120lbs. M.F.80lbs. M.F. 95lbs. M.F.150lbs. M.F. 80lbs. M.F. 90lbs C.F.160 " S.C. S.C.. C.F.180 " S.C. S.C. 2. M.F.140 " M.F.80 " M.F.100 " M.F.150 " M.F. 90 " M.F.100 " C.F.160 " C.F.100" S.C. C.F.175 " C.F.120 " S.C. 3. M.F. 70 " M.F.90 " M.F. 50 " M.F. 90 " M.F. 90 " M.F. 50 " C.F. 85 " S.C. S.C. C.F.110 " S.C. S.C. 4. M.F.190 " M.F.100" M.F. 30 " M.F.210 " M.F.125 " M.F. 50 " C.F.230 " C.F.120" S.C. C.F.240 " S.C.135 " S.C. 5. M.F.130 " F.{Mr Friese} F.{Mr Friese} M.F.140 " F.{Mr Friese} F.{Mr Friese} C.F.150 " C.F.175 " 6. M.F.130 " M.F.120" M.F.100 " M.F.140 " M.F.135 " M.F.100 " C.F.155 " C.F.140" S.C. C.F.160 " C.F.150 " S.C. 7. M.F.160 " M.F. 80 " M.F.170 " M.F. 80 " C.F.190 " S.C. C.F.200 " S.C. 8. M.F. 70 " F.{Mr Friese} F.{Mr Friese} M.F.100 " F.{Mr Friese} C.F. 85 " C.F.120 " 9. M.F.120 " M.F. 70 " M.F.140 " M.F. 70 " C.F.140 " S.C. C.F.160 " S.C. 10. M.F.200 " M.F. 40 " M.F.230 " M.F. 40 " C.F.220 " S.C. C.F.250 " S.C. 11. M.F.100 " M.F. 40 " M.F.110 " M.F. 45 " C.F.120 " S.C. C.F.135 " S.C. 12. M.F.260 " M.F.30 " M.F.300 " M.F. 30 " C.F.280 " S.C. C.F.325 " S.C. Hm.{Capt. W. Hallam - Head Repairs} | ||