Specification revision for the Peregrine.ll. No.4 Unit, detailing changes to the camshaft and pistons.
| Identifier | ExFiles\Box 169\4\ img162 | |
| Date | 1st June 1933 | |
| To Hs {Lord Ernest Hives - Chair} , from RHC {R. H. Coverley - Production Engineer} /WSC. {W. S. Cassel} P.d unit [REDACTED] RHC {R. H. Coverley - Production Engineer} /WSC. {W. S. Cassel} 6/AP.1.6.33. Peregrine(Experimental Bentley car never produced / Aero Engine).ll. No.4. Unit. Specification of the above Unit is revised as follows:- Passed to test. 1.6.33. Camshaft IOP.E.100112. Valve timing set one tooth earlier i.e. - I.O. 1° A.T.D.C. E.C. 1° B.T.D.C. Pistons IOP.E.100158. The following New piston rings fitted:- Hs. {Lord Ernest Hives - Chair} 945 Scraper rings -.015 Chamfer. Hs. {Lord Ernest Hives - Chair} 949 Gas rings-next above scraper rings. RHC {R. H. Coverley - Production Engineer} /WSC. {W. S. Cassel} | ||
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).