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).
Specification for a Large Bore Engine unit, detailing components and part numbers.
| Identifier | ExFiles\Box 83\1\ scan0033 | |
| Date | 31th August 1935 | |
| -5- Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}1/KW.31.8.35. ENGINE. B.19 Large Bore Unit, to the following specification :- Crankcase & Bearings. Ex.18383 crankcase with spread stud centres and stiffened casting incorporating 1 1/2 : 1 ratio dynamo and geared starter motor. White metal main bearings. ? Crankshaft. Standard production. Spring Drive. Increased inertia type to Hs.{Lord Ernest Hives - Chair}1894 as fitted to B-4-A unit. Connecting Rods. Standard production "drilled up" type. RR. lead bronze centi-cast big end bearings. Large bolts EB.2222 and nuts 2220. Pistons. Aerolite 3.500 bore with strengthened gudgeon pin bosses. Cylinders. EB.2561 cylinder block, incorporating LeC.4538 and having spread stud centres. EB.2560 cylinder head, 109 c.c's, giving 6.8 : 1 compression ratio; Cylinder head gasket to suit large bore with spread stud centres. | ||