Specifications for a large bore engine unit (No. U75), detailing the cylinder head, Stromberg carburettor, and jet settings.
| Identifier | ExFiles\Box 20\9\ Scan118 | |
| Date | 12th February 1936 | |
| X1033 To Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} c. to HS {Lord Ernest Hives - Chair} /Bwdl. c. to HS {Lord Ernest Hives - Chair} /CTS. {C. Trot Salt - Carburation} Hs {Lord Ernest Hives - Chair} /CR. {Mr Cra’ster / Mr Chichester} 12/JH.12. 2.36. 18-C-IV. (Large Bore) Unit No.U75. Ex.19456 cylinder head complete with Ex.21111/2 manifolds fitted. Stromberg carb. DB. {Donald Bastow - Suspensions} 42 fitted with automatic device converted to hand control spring loaded choke. E.83210 spring fitted to radiator thermostat. Specification of carburetter, as previously on GOS-5 (L.S.M.) Choke 1 1/2" dia. Main metering jet. .064. Bypass jet .042. Main discharge tube with single feed hole 56. Idle tube jet 64 1/2 Pump jet 75 and set on minimum stroke. Air bleed 70. Leaning .130 Petrol level .625". Hs {Lord Ernest Hives - Chair} /C. Ratcliffe. | ||
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).