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).
Removing and weighing a Hispano engine unit, comparing its weight to an EAC engine ahead of power curve testing.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan81 | |
| Date | 1st February 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} Expl. No. 4214 / 9771 REF: Hs{Lord Ernest Hives - Chair}1/LG14 2. 24. EXPERIMENTAL REPORT. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CH. RG.{Mr Rowledge} c. to PN.{Mr Northey} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} S E C R E T. HISPANO. <- EAC HP's COMPARED We have removed the engine unit from the car we have and are fixing it up on the bench test. We shall then be able to obtain accurate power curves and full particulars of the engine. We have weighed the complete unit as we removed it from the chassis - the weight includes - Complete engine, gearbox, servo, starter, generator, clutch, carburetter, exhaust pipes, oil in engine and gearbox, water pipes, controls - WEIGHT - 844 lbs. This does not include change speed and brake levers. In comparing this weight with EAC. engine only 940 lbs., we should take into account that the EAC. is 16% larger engine. Also the Hispano has no detachable head. On the other hand, the design of the Hispano crankcase does away with the necessity of engine guards. After we have completed the power curves, we propose to weigh the units separately. We have already had the Hispano on the road wheel dynamometer but at the high speeds, a pistons seized. This has since been replaced. contd:- | ||