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).
Progress report on engineering tasks for the 20/25 HP chassis and Spectre 12-cylinder engine.
| Identifier | ExFiles\Box 30\4\ Scan098 | |
| Date | 19th February 1934 | |
| - 13 - 20/25 HP. CHASSIS. N.Sch.3970 Brake Linkage, Direct Pull-up to Four Wheel Brakes. Recd.10.2.34 Detail drawings are in hand. SPECTRECodename for Phantom III 12-CYL. ENGINE. LeC.3728 Connecting Rods for seven bearing Crankshaft with 2.250" dia. crankpins .................. Recd.15.12.33 Detail drawings completed and issued ................. 16.1.34 LeC.3753 Cylinder Head (See LeC.3754) .................... Recd. 8.1.34 Detail drawings completed and issued ................. 8.2.34 LeC.3742 Left and Right Hand Carburetters ............... Recd. 1.2.34 LeC.3750 Automatically Adjusting Tappets & Rocker Cover ... Recd. 24.1.34 LeC.3756 Oil Temperature Regulator ....................... Recd. 27.1.34 LeC.3772 Idler & Dynamo Drive Gears ..................... Recd. 27.1.34 LeC.3778 Water Pump and Drive ........................... Recd. 27.1.34 LeC.3779 Starter Motor Housing & Rear End of Crankcase .... Recd. 27.1.34 LeC.3785 Oil Drain Cock combined with Oil level device .... Recd. 31.1.34 LeC.3788 Oil Gallery Pipe & Crankcase Webs and Joint Face Recd. 31.1.34 LeC.3790 Oil Relief Valves and Pressure Filter .......... Recd. 2.2.34 LeC.3792 Experimental Air Intake Silencer ............... Recd. 1.2.34 LeC.3793 Exhaust Manifold with air cooled fins (inverted plan).Recd.1.2.34 LeC.3794 Spring Drive and Slipper Flywheel .............. Recd. 9.2.34 LeC.3797 Springs for Oil Relief Valves and Pressure Filter (See LeC.3790) .............................. Recd. 6.2.34 Detail drawings will be put in hand as soon as possible. LeC.3754 Cylinder Head and Top Part of Crankcase ........... Recd. 18.1.34 Cylinder Head instructed ............................ 8.2.34 Top half crankcase is in hand. LeC.3760 Valve Lift Calculations .......................... Recd. 24.1.34 Detail drawings not required. LeC.3764 Cylinder Head 6.0 to 1 Comp'n. Ratio ............ Recd. 18.1.34 Detail drawings completed and issued ................. 8.2.34 LeC.3770 Crankshaft & Balance Weights ..................... Recd. 19.1.34 Crankshaft detailed and instructed .................... 2.2.34 Remainder as soon as possible. LeC.3780 Induction System - Carbs. to LeC.3742 ........... Recd. 1.2.34 Detail drawings completed and issued ................. 17.2.34 | ||