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 Phantom cylinders to reduce engine knock.
| Identifier | ExFiles\Box 48\1\ Scan174 | |
| Date | 12th March 1926 | |
| Y4190 To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} to MX.{John H Maddocks - Chief Proving Officer} c. to EP.{G. Eric Platford - Chief Quality Engineer} Hm{Capt. W. Hallam - Head Repairs}3/LG12.3.26. X8050 Y4190 PHANTOM CYLINDERS. Attached is a blue-print of the Phantom cylinders marked to shew the extra thickness on the trunks which we have found on experimental tests to greatly reduce the knocks which are at present troubling them on production cars. We recommend that this extra thickness is added to the cylinder blocks at once. We think it might be advisable from a Works point of view to push ahead with several sets of these modified cylinders so that when they have a car rejected for piston knocks they can change the blocks. We hope it will not be imagined that this is going to be a cure for all piston troubles. We anticipate we shall still have piston knocks of the usual type. The Expl: Dept: would like an opportunity of listening to any knocks which are reported when these new cylinders are fitted which can be heard with the bonnet closed. We are not interested in knocks which can only be heard by means of a rod or by putting ones ear over the breather. Hs.{Lord Ernest Hives - Chair} | ||