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).
Analysis of an Alfa Romeo engine, comparing its performance and design to internal projects.
| Identifier | ExFiles\Box 124\5\ scan0072 | |
| Date | 18th March 1932 | |
| HS.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence.) X4482 R1/M18.3.32. X.4482. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} C. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} re. ALFA ROMEO. This seems a jolly good little engine, which gives almost exactly our estimate for the Peregrine sized Bensport of 100HP. at 4000 RPM. It rather confirms our wish for this as a model of efficiency. The valve timing is our WW. ideal of rather later exhaust and late closing inlet - in round figures : I.O. 10° E.C. 15° I.C. 60° E.O. 45° With .013 clearance. and agrees with Derby's idea of the same inlet and exhaust cams. With .020 clearance timing equals about 225°, and much less overlap. Since writing the above I have received further particu-lars via Mr. Grylls, and many of the details such as valves, pistons, connecting rods, would not suit our views becuase we should not expect them to remain in good order for a long time. I understand that in the 8 cyl. engine they have adopted a bearing each side of each crank - i.e. 9 or 10 bearings. This is their later work and they must have good reason for departing from the more usual 5 bearing crankshaft for a "straight eight" cylinder engine. Our Peregrine master period may be too low for a supercharged engine. Perhaps Mr. Grylls will report on this. R.{Sir Henry Royce} | ||