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).
The Lincoln car's power unit, detailing crankshaft dimensions, firing order, and bearing specifications.
| Identifier | ExFiles\Box 127\2\ scan0035 | |
| Date | 12th February 1934 | |
| COPY OF REPORT FROM Rs.{Sir Henry Royce's Secretary} IN U.S.A., DATED 1.2.34. To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Ds. c. to Hly. X3929 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KW.12.2.34. LINCOLN CAR. There is a considerable amount of interest attached to this power unit, particularly as they have this year changed from a seven bearing forked big end construction, to a side by side four bearing type. The four bearing shaft is fully balanced. The balance weights are forged integral with the shaft. The engine is now 3-1/8 x 4-1/2. Firing order 1-4-9-8-5-2-11-10-3-6-7-12 Angle between the cylinders 67° Crankshaft dimensions: Journal dia. 2.625" Pin dia. 2.5 Pin length 1.995 (less than 1"/Fsd.) Main bearings A - 1.629" long " B - 3.5" " C - 1.875" Front Distance between adjacent cylinders 3.9" approximately " " " 2 & 3, etc. 5.125" Over-all length of crank from flywheel flange to front of main bearing C 31.7" Finished crank weight 80 lbs. Worst period presumably 6/rev. without damper load (they have a fair hub) 2,200 r.p.m. | ||