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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).
List of weights for the components of a 2-litre type JGS engine with a fully counterweighted, completely machined crankshaft.

Identifier  ExFiles\Box 134\2\  scan0172
Date  1st December 1934 guessed
  
COVENTRY CLIMAX ENGINES LTD. SHEET No.........

WEIGHTS OF COMPONENTS FOR 2 LITRE TYPE JGS.ENGINE FITTED
WITH FULLY COUNTERWEIGHTED COMPLETELY MACHINED CRANKSHAFT.

B. C.C.
1. Cylinder Block and Crankcase combined casting. 220 155 lb
(Liners are not fitted), completed with bearing
caps, white metal bearings and all studs.

2. Cylinder Head, including three rocker covers, 27.75 45.50 "
rocker cover joints and cylinder head gasket.

3. Crankshaft as specified above fitted with Starter Jaw. 53.50 61.50 "

4. Six Connecting Rod and Piston Assemblies. 18.5 14.25 "

5. Flywheel. 52.5 27.25 "

6. Sump, Oil Filter, Oil Pump and Drive. 22.75 28.25 "

7. Timing Cover with Auxiliary Cover Plates and Setscrews. 3.50 5 "

8. Rocker Feed Oil Pipe and Oil Suction Pipe, the latter 2.00 1.50 "
in Sump.

9. Cooling System including Water Inlet and Outlet Pipes, 15.75 15.75 "
Water Pump Assembly complete, Crankshaft Pulley and
Dynamo Pulley.

10. Induction Pipes and Exhaust Manifold. 16.50 17.75 "

11. Carburetters. (2 S.U. Down Draught). 13.00 9.25 "

12. Front Engine Supports and Flywheel Housing. 20.50 20.50 "

13. Clutch (Borg & Beck). 31.25 11.50 "

14. Valve Gear comprising Inlet and Exhaust Valves, Inlet 13.50 9.25 "
Rockers and Rocker Brackets, Inlet and Exhaust Springs,
Tappets and Push Rods.

15. Tappet Blocks. 1.75 3.25 "

16. Camshaft including bearings and cam chain wheel. 17.25 11.50 "

17. Electrical Parts i.e. Dynamo, Starter and Vertex Magneto.56.50 46.75 "

18. Front Engine Plate. - 3.50 "

19. Damper Complete. 16.75 14.75 "

20. Timing Chain and Crankshaft Chain Wheel. 3.00 2.25 "
  
  


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