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).
Suitability of a Peregrine crankshaft for a supercharged engine, comparing it to an Alfa Romeo design.
| Identifier | ExFiles\Box 85\5\ scan0002 | |
| Date | 24th March 1932 | |
| R.{Sir Henry Royce} From HS{Lord Ernest Hives - Chair}/GRY.{Shadwell Grylls} S. to Dr. HOF. C. to F.{Mr Friese} HY.{Tom Haldenby - Plant Engineer} 821F Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}6/HA. 24. 3. 32. BENTSPORT CRANKSHAFT. Replying to your H.1/W.18.3.32. We do not consider the Peregrine crankshaft suitable for the supercharged engine. With a damper hub and supercharger similar to the Alfa Romeo the master periods will be below 3000 R.P.M. and would often be reached on the road particularly on the indi-rect gears. The master period can be raised by using a crankshaft of larger dimensions or by having 5 instead of 3 bearings. The Alfa Romeo 6 cyl 2350 cc engine has a 10 bearing disc web crankshaft with 75 mms journals which would probably put the master period above the speed range of the engine. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||