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).
Graph showing average cylinder wear per 30,000 miles on a Bentley 6 1/2 Litre engine, comparing Smith-Bentley and Twin SU carburetors.
| Identifier | ExFiles\Box 132\4\ scan0134 | |
| Date | 9th April 1938 | |
| FITTED WITH 'SMITH-BENTLEY' CARBS FITTED WITH TWIN 'SU' CARBS .015 .010 .005 WB{Mr Brazier/Mr Bell} TB FW WK TW BX DH{D. Henderson - Showroom} KD PR RR MD FA WT KF LB BA FR KR SB{Mr Bull/Mr Bannister} NH LR{Mr Ellor} HM{Capt. W. Hallam - Head Repairs} 1925 1926 1927 1928 1929 1930 1931 SERIES & APPROX: YEAR OF PRODUCTION GRAPH SHOWING AVERAGE CYLINDER WEAR PER 30,000 MILES OF BENTLEY 6 1/2 LITRE ENGINE. MEASUREMENTS TAKEN OVER 3 YEARS 1933-4-5 | ||