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).
Summary of total running times for various components of a B-4 Unit.
| Identifier | ExFiles\Box 90a\3\ Scan099 | |
| Date | 1st July 1935 | |
| B-4 Unit - Total running time to date July 1st 1935. | | Number or Type | Running Time - Total | Running Time - Full Throttle | Specification | |---|---|---|---|---| | Bearings:- Main. | EB612/3/4 W/Mt. | 225 hrs 30 mins | 63 hrs. | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}5/EP{G. Eric Platford - Chief Quality Engineer}6.9.34. | | Big End. 50/50 | E55612/3 .0018 clnce. Lead Bronze | 117 hrs 30 mins | 38 hrs. | RHC{R. H. Coverley - Production Engineer}/CP6/EP{G. Eric Platford - Chief Quality Engineer}4.3.35. | | Con. Rods | EB1603/4 | 117 hrs 30 mins | 38 hrs. | RHC{R. H. Coverley - Production Engineer}/CP6/EP{G. Eric Platford - Chief Quality Engineer}4.3.35. | | Pistons | "Aerolite" G-4 | 167 hrs 45 mins | 49 hrs. 35 mins | RHC{R. H. Coverley - Production Engineer}/CP6/BC11.1.35 | | Cyl.Block | EB.1752 .002 o/s. | 167 hrs 45 mins | 49 hrs. 35 mins | RHC{R. H. Coverley - Production Engineer}/CP6/BC11.1.35. | | Crankshaft | LOP.EB.1211 Std. Prod. type. | 198 hrs 45 mins | 52 hrs. | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}5/EP{G. Eric Platford - Chief Quality Engineer}29.11.34 | | ||