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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).
Engine start test results at low temperatures using different oils with the clutch disengaged.

Identifier  ExFiles\Box 151\3\  scan0338
Date  10th December 1937 guessed
  
37-EX.

WITH MOBILOIL ARCTIC CLUTCH DISENGAGED.

Room Temp. | Oil in Sump. | Remarks | Starts every 20 - 30 mins.
-8°F | 32°F | 2 secs. started, ran evenly immediately | R.P.M. 50
1°F | 23°F | 3 secs. fired for 9-10 secs.
2 secs. Started. ran evenly immediately | R.P.M. 45
-11°F | 14°F | 7 secs. threw out
3 secs. fired for 12 secs.
7 secs. threw out
4 secs. Started & after 20 secs. ran evenly. | R.P.M. 40

WITH CASTROL X.L.

-4°F | 41°F | 2 secs. started & ran evenly immediately | R.P.M. 45
-8°F | 32°F | 2 secs. Started & ran evenly immediately | R.P.M. 40
-11°F | 23°F | 3 secs. threw out
3 secs. started & after 7 secs. ran evenly | R.P.M. 36
-11°F | 14°F | 6 secs. threw out
4 secs. threw out
4 secs. fired for 6-7 secs.
5 secs. Started & after 10 secs. ran evenly | R.P.M. 36
  
  


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