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).
Comparison of engine specifications between the Lorraine-Dietrich and a standard 20 HP engine.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 131 | |
| Date | 30th March 1927 | |
| GENERAL DESCRIPTION OF THE LORRAINE-DIETRICH ENGINE. (WITH STANDARD 20 H.P. R.R. FIGURES FOR COMPARISON). HEADER: LORRAINE-DIETRICH. | 20 H.P. R.R. BORE.: 75 m/m (2.95 INS) | 3.00 INS. STROKE.: 130 m/m (5.12 INS) | 4.50 INS. TOTAL SWEPT VOLUME.: 3444 c.c. | 3127 c.c. COMPRESSION RATIO.: 5.9 TO 1 | 4.75 TO 1 CONN. ROD / CRANK RATIO.: 3.54 | 3.53 RECIPROCATING WEIGHT.: 1.38 LBS. | 1.72 LBS. MAXIMUM B.H.P. (WITH SILENCER).: 72.5 (2750 RPM) | 50.0 (2750 RPM) MAXIMUM B.M.E.P. (WITH SILENCER).: 107.0 (2200 RPM) | 91.0 (1250 RPM) MAXIMUM COMPRESSION PRESSURE.: 132.5 (2250 RPM) | 94.3 (2250 RPM) MAXIMUM B.H.P. PER LITRE. (WITH SILENCER).: 21.1 | 16.0 MAXIMUM VALVE LIFT. (NO TAPPET CLEARANCE).: .375 IN. | .340 IN. AREA PAST VALVES (FULL LIFT).: 1.61 SQ. INS. | 1.04 SQ. INS. FREE AREA PAST VALVES / PISTON AREA RATIO.: .2354 | .1472 VALVE TIMING (.020" TAPPET CLEARANCE). INLET OPENS.: 13° AFTER T.D.C. | 10° AFTER T.D.C. INLET CLOSES.: 63° AFTER B.D.C. | 34° AFTER B.D.C. EXHAUST OPENS.: 50° BEFORE B.D.C. | 38° BEFORE B.D.C. EXHAUST CLOSES.: T.D.C. | 2° AFTER T.D.C. IGNITION ADVANCE REQUIRED AT MAXIMUM B.H.P.: 33° BEFORE T.D.C. INERTIA OF FLYWHEEL: .3767 LBS. FT² UNITS. | .6911 LBS. FT² UNITS. CARBURETTORS.: TWO ZENITH TRIPLE VENTURI HORIZONTAL TYPE, EACH FEEDING THREE CYLINDERS. NO BALANCE PIPE. | SINGLE R.R. STD. EXPANDING TYPE. | ||