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 issue of the connecting rod big end no longer passing through the cylinder bore due to a crankpin diameter increase.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan317 | |
| Date | 7th February 1931 | |
| R/C. FROM E.{Mr Elliott - Chief Engineer} C. to SC. R.{Sir Henry Royce} WOR.{Arthur Wormald - General Works Manager} C. to HS.{Lord Ernest Hives - Chair} PY. SECRET. JAPAN 3. CON. ROD BIG END. E2/W7.2.31. x5030. We notice that owing to the increase in dia. of the crankpin over the 25HP. the con. rod big end will no longer pass through the cylinder bore, being 3.5" wide. We are looking into the question of reducing this dimension but we should be glad if you would confirm that the method of assembly by threading rods and pistons through the cyl. block is definitely of use either in the production or the repair departments. E.{Mr Elliott - Chief Engineer} | ||