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).
Comparative table of component specifications for various Bentley and Peregrine models.
| Identifier | ExFiles\Box 3\4\ 04-page004 | |
| Date | 21th December 1931 guessed | |
| SECTION | COMMON TO 3 LIT BENTLEY AND PEREGRINE | SPECIFICATION OF PEREGRINE | SPECIAL TO BENTLEY ENGINE. | Crankshaft, con rods, and pistons. Valves, springs, fittings & guides. Water and oil pumps, oil relief unit. Petrol pump & other small accessories. | Scaled down from J.{Mr Johnson W.M.} 3. Bore 69.5mm Stroke 105mm Tax £18. (2.73 L 4.125. RR. Carburetter. | Overhead camshaft with engine in front driv on oil crank shaft. Carb: Bentley CLUTCH AND FLYWHEEL. | Clutch & casing including operating shaft. | Single plate scaled down from J.{Mr Johnson W.M.} 3. except shaft. | Stronger clutch spring load. PROPELLER SHAFT. | Mechanic's joints. Common shafts, different lengths. | Same as J.{Mr Johnson W.M.} 3. except shaft. | Shorter shaft. GEARBOX (1st. suggestion.) | Wheels & shafts only. | Synchro mesh 3rd. speed scaled down from J.{Mr Johnson W.M.} 3. with no servo & with side lever. | Another box with same wheel but central levers. GEARBOX (2nd. suggestion.) | Complete box with central levers & no servo scaled down from J.{Mr Johnson W.M.} 3. | Synchro mesh 3rd. speed scaled down from J.{Mr Johnson W.M.} 3. No servo, & with central levers. | Position of levers. REAR AXLE AND TUBES. | Whole axle and tubes except gears. | Scaled down J.{Mr Johnson W.M.} 3. 4.75 to 1 ratio. | Higher ratio gears 4.1 to 1 ratio. REAR BRAKES. | All parts. | Single set of shoes, 12" drums, 2 ropes to shoes rest scaled down from J.3. | --- RADIATOR & SHUTTERS | Thermostat and shutter mechanism. | Scaled down from J.{Mr Johnson W.M.} 3. & J.{Mr Johnson W.M.} 3. shutter mechanism thermostat. | Bentley radiator sloping. | ||