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).
Test report investigating crankshaft bending in an experimental engine.
| Identifier | ExFiles\Box 127\4\ scan0027 | |
| Date | 14th April 1936 | |
| CHEV. 164 Chevr Vans hall File 1097 TECHNICAL TEST REPORT Messrs. J.{Mr Johnson W.M.} M.{Mr Moon / Mr Moore} Crawford, J.{Mr Johnson W.M.} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Wood, E.{Mr Elliott - Chief Engineer} S. MacPherson, H.{Arthur M. Hanbury - Head Complaints} B. Shoemaker, P. A.{Mr Adams} Collins, A.{Mr Adams} J.{Mr Johnson W.M.} Underwood, E.{Mr Elliott - Chief Engineer} H.{Arthur M. Hanbury - Head Complaints} Kelley, A.{Mr Adams} Taub. ENG. CHEVROLET DEPT. DETROIT, MICHIGAN SHEET NO 1. NO. OF SHEET 4. WORK ORDER 6205-3. DATE 2-13-36. FILE NO *6. Reported 4-14-36. Requested by E.{Mr Elliott - Chief Engineer} H.{Arthur M. Hanbury - Head Complaints} Kelley. INVESTIGATION OF CRANKSHAFT BENDING IN EXPERIMENTAL ENGINE #5050-28-H.{Arthur M. Hanbury - Head Complaints} CrankShaft OBJECT OF TEST: - To investigate the crankshaft bending in Experimental Engine #5050-28-H.{Arthur M. Hanbury - Head Complaints} MATERIALS TESTED: - One Experimental Engine #5050-28-H, 6 cylinders, 3-1/2" bore, 3-3/4" stroke, 216.45 cu.in. displacement. This engine incorporated the following parts: - Cylinder and Case #0-58571 (10-24-35). This case had four crankshaft bearings. Crankshaft #0-58266 (12-19-35). Harmonic Balancer Assembly #0-58934 (11-19-35) except the drive pin diameter was increased to .592". This is the assembly developed under set up #9 of Work Order #5050-98, File #5. Cylinder Head Assembly #0-60545 (12-2-35). The compression ratio of the engine incorporating this head was measured under Work Order #5050-77, File #5, and found to be 6.29:1. CONCLUSIONS: - The crankshaft bending as measured at the front end of Engine #5050-28-H was considerably less than that of an early engine of the 7002 Series (Model #1951, G.M. Research Report #S-1101). The index of crankshaft bending under full load operation in the former was 44% of that of the latter at 500 R.P.M. and at 4000 R.P.M. but 16%. There was no indication of any resonant periods. METHOD OF TEST: - Crankshaft Bearings Front, Front Intermediate, Rear Intermediate, Rear Whenever an engine is operating the harmonics of the combustion curve cause the crankshaft to vibrate laterally between its supports as shown by the dash line in the adjacent sketch. The shape that the longitudinal axis of the shaft assumes is known as its elastic line. The measurement of the actual amplitude of the elastic line between the crankshaft bearings would be rather difficult, but it can be indirectly obtained from the slope of the elastic line at the front crankshaft bearing. The changes of slope are indicated by the movement of the outer end (A) of a light stiff shaft attached to the front of the crankshaft. A sketch of the G.M. Research Crankshaft Bending Indicator, which operates on the above principle, is shown on sheet #4. The distance from the free end of the extension shaft to the center line of the front crankshaft bearing was 10". This was the standard | ||