Production recommendations following a test of crankcase and breather modifications on 20 HP and Phantom models.
| Identifier | ExFiles\Box 103\2\ scan0210 | |
| Date | 20th August 1930 guessed | |
| -4- through the crankcase annulus into the crankcase. A most noticeable feature was the lowering of the compression in the crankcase when the throttle was opened, whereas previous to the alteration to the breather no difference could be observed. The pressure readings were taken behind the flywheel and at the filler pipe. We have run the car 100 miles at all speeds with the alteration stated and no oil leak can be observed. We recommend the following for production :- NY scheme of larger annulus round the end bearing. Breathers in rocker cover deleted. Breather pipe to extend into inner intake of carburetter. Bottom drain holes in flywheel and gear case deleted plug if necessary. Slot cut in gear case under cover 1.00" wide .500" deep. This should be applied to 20 HP. and Phantom. Hs {Lord Ernest Hives - Chair} /GWH. {George W. Hancock - Head Chateauroux} | ||
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).