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).
Engine modification to a 3.5 litre engine and subsequent road test results.
| Identifier | ExFiles\Box 131\2\ scan0021 | |
| Date | 19th August 1937 guessed | |
| -2- We are waiting for another car under the same conditions to confirm these results. ------- B.169.BL. R.H.Winn. We have had the first case of carrying out the modification C. to a 3 1/2 litre i.e. drilled crankshaft, main bearings grooved, large oil pump, new piston rings (lapped in). (Wear of cylinder bore .006" to .004") These bores were at the limit before re-boring was necessary. New conn. rod bearings. No holes in conn. rods. (old type.) Test on road 100 miles. No oil used. Oil pressure hot 12 lbs. idling 30 lbs. 80 M.P.H. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||