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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).
Performance test results for chassis 12-GIV and 16-GIV at Brooklands, comparing different axle and carburettor configurations.

Identifier  ExFiles\Box 29\3\  Scan348
Date  26th August 1931
  
To Hs.{Lord Ernest Hives - Chair} from F.{Mr Friese} Dodd.

12-GIV AT BROOKLANDS 26.8.31.

Special engine - 12 tooth axle.

Std. R.R. carb.

Lap Speed. 1/2 mile Speed.
73.6 M.P.H. 75.0 M.P.H. - cut out closed.
73.6 " 76.6 " - cut out open.


12 tooth Axle. S.U. carburetter.

Lap Speed. 1/2 mile speed.
76.39 M.P.H. 80.36 M.P.H. - cut out closed.
78.43 " 80.36 " - cut out open.


16-GIV at BROOKLANDS.

Lap Speed. 1/2 Mile Speed.
65.52 M.P.H. 67.16 M.P.H. - cut out closed.
70 M.P.H. 72 M.P.H. - cut out open.
  
  


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