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).
Modifications to the 20 HP crankshaft and connecting rod, increasing the crankpin diameter and oval web width.
| Identifier | ExFiles\Box 103\2\ scan0195 | |
| Date | 10th December 1927 | |
| BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} +5800 c. to BJ. Hs.{Lord Ernest Hives - Chair} E1/M10.12.27. 20 HP. CRANKSHAFT AND CONN. ROD. X.5010 X.5030 X.5000 ------------------------------- We send you herewith LeC.2498 shewing modific- ations to the new 20 HP. crankshaft whereby the dia. of the crankpin is increased from 1.5 to 1.75, and the width of the oval web is increased from 3" to 3 1/4". As a new conn. rod is necessitated by the larger crankpin we have produced one of the tubular pattern. This type of rod has a somewhat neater end and the banjo goes into the crankchamber with a little more clearance. A drawing shewing particulars of the piston will follow. The modified piston is required on account of the lubrication of the little end. E.{Mr Elliott - Chief Engineer} | ||