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 comparing spark plug performance at different magneto speeds.
| Identifier | ExFiles\Box 33\3\ Scan029 | |
| Date | 1st November 1919 guessed | |
| COPY Abbreviations:- M.F. - Misfires at C.F. - Cease fires at S.C. - Short circuit 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.90 lbs. C.F.160" C.F.100" S.C. C.F.180" S.C. S.C. 2. M.F.140lbs. M.F.80lbs. M.F.100" M.F.150lbs. 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" C.F.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" 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} 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. [Hand-drawn sketches of spark plug components] | ||