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).
Testing Chrysler balance weights on a 25 HP engine to eliminate flywheel vibration.
| Identifier | Morton\M9\ img008 | |
| Date | 21th September 1931 | |
| To R.{Sir Henry Royce} from.Hs{Lord Ernest Hives - Chair}/Cry c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager}..E. C. Ds. PV. Hs{Lord Ernest Hives - Chair}/Cry.1/AD21.9.31. X.634. X.5810. BALANCE WEIGHTS 25 HP. We can now report on a test of Chrysler balance weights to LeC.2936 on a car which, without balance weights, had a considerable flywheel vibration at 3100 R.P.M. The effect of the balance weights giving about 95% balance of crankshaft and big end was almost entirely to eliminate this vibration. From our previous test on R's eight weight scheme (the big weights in each case being identical) we consider that either scheme of balance weights is equally beneficial in removing the flywheel vibration. We therefore have to choose between the two. The Chrysler scheme having 4 more small weights than R's scheme must necessarily produce the lower torsional period of the two. Which scheme is the better for the bearings would need a very long test to determine, but the efficiency of the eight weight scheme is proved on the R.{Sir Henry Royce} engine. Taking into account the manufacturing difficulties of the Chrysler scheme we suggest that for the present engine we use the crankshaft to LeC.2948 which can be made from the existing forging in conjunction with 4 big weights as shown on LeC.2948 and should therefore like W.W. to send us a design for the half weights Nos. 3, 4, 9 and 10 opposite to the crankpin to complete the balance of the crankshaft to the eight weight scheme. Hs{Lord Ernest Hives - Chair}/Cry. | ||