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).
The performance and modifications of radiator, engine coupling, and frame components.
| Identifier | ExFiles\Box 92\3\ scan0284 | |
| Date | 26th January 1937 guessed | |
| ( 17 ) Radiator & Fittings. LOP. E.87239. Complete to the above LOP incorporating:- Mark IV. Lightened Matrix. Ex.25119 Steam Chamber Ex.25120 Outlet Ex.25121 Filler Cap. Lec.5258 Rad. Yoke with rear cross bracing. Radiator Shutters LOP. E.87306 Standard Production. Loss of water as a result of deleting the steam valve was not serious. Under normal conditions, it was necessary to add 2 pints every 2500 miles. With more violent driving in hilly country, it was shown that two gallons could be lost in 6250 miles, after which boiling occurred. No structural weaknesses were observed. Top Water Hose Connections. Leyland Petrol & Oil resisting rubber hose. Specification 1633 K.{Mr Kilner} This piping has covered over 25,000 miles and is thoroughly satisfactory. Engine Coupling. LOP. G.8847I N.S.4537. Existing complete to the above LOP. The following new parts fitted:- NS.{Norman Scott}4908 Increased Flexibility of Engine Coupling. The engine coupling was free from vibration, and no trouble was experienced. The flexible steel coupling discs are a good thing. Frame & Fittings. LOP. F.87515. Strengthened Side Guards. Ex.25941-2-3 Side Guards. The special side guards were not effective in keeping the engine clean under very muddy conditions. They were improved by extending them 10" further back along the chassis, and were then satisfactory for all normal conditions such as would be met in England, but were still not effective against really bad mud. It was necessary to increase the clearance between the front transverse shield and the exhaust pipes and brake rope. (contd) | ||