Graph comparing B.M.E.P. versus Piston Speed for various engines, with tables for valve timings, compression ratios, fuel, and engine specifications.
| Identifier | ExFiles\Box 144\4\ scan0076 | |
| Date | 19th April 1940 guessed | |
| B.M.E.P. S.183 DATA ① ASPIN 4.125 BORE 6" STROKE ② ASPIN 2.913 BORE 3.189 STROKE ③ RUDGE 3.346 BORE 3.464 STROKE ④ R.R 3.5 BORE 4.5 STROKE NORMAL CAR ENGINE ⑤ R.R 3.5 BORE 4.5 STROKE WITH SIX AMAL CARBS. NORMAL CAR ENGINE TUNED FOR RACING VALVE TIMINGS I.O. I.C. E.O. E.C. ① 5 BT {Capt. J. S. Burt - Engineer} 50 AB 35 BB 6 AT ② 20 BT {Capt. J. S. Burt - Engineer} 50 AB 55 BB 25 AT ③ 4° BT {Capt. J. S. Burt - Engineer} 50 AB 50 BB 7 AT ④ 2° BT {Capt. J. S. Burt - Engineer} 28 AB 51 BB 7 AT C/R ① 13.6:1 ③ 8:1 ④ 6.25:1 FUEL ① 65% POOL 35% BENZOL (73 OCT ALLEGED) ② 65% POOL 35% BENZOL (73 OCT ALLEGED) PISTON SPEED (FT/MIN) CORRESPONDING R.P.M. FOR R.R. ENGINES (4.500" STROKE) | ||
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).