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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 car 1.EX, a 4-seater open touring body, under various engine and exhaust configurations.

Identifier  ExFiles\Box 29\3\  Scan104
Date  13th September 1922 guessed
  
Particulars of car 1.EX - 4-seater open touring body - windscreen and hood - all accessories - weight complete 46½ cwts. during tests.
15 X 52 axle ratio.
Tests were taken to prove that ignition and mixture were set to give the best results.

TESTS.
High compression. 23¼ cu.ins. Exhaust cut-out.
Open. closed.
Low compression. 26 cu.ins. Exhaust cutout.
Open. closed.

Max. speed for one lap.
m.p.h. 69.66
m.p.h. 68.85
m.p.h. 68.76
m.p.h. 64.8

Max. speed for ¼ mile.
69.23
66
67.67
66.7

Acceleration.
secs.
secs.
secs.
secs.

10 m.p.h. to 65 m.p.h. 44½ 58 50
20 " " 65 " 41½ 53½ 47
30 " " 65 " 37¾ 46½ 35
40 " " 65 " 31¼ 35 34

10 " " 60 " 33¼ 37½ 37 41
20 " " 60 " 29½ 32 32 37
30 " " 60 " 25 26½ 29 32
40 " " 60 " 18½ 21½ 22 26

10 " " 50 " 23 25 24½ 26
20 " " 50 " 18 20 20 25
30 " " 50 " 14 14 17 19
40 " " 50 " 7½ 8 10 11½

¼ mile acceleration test
starting at 10 m.p.h. 41½ 43 46 48½
20 " 39 40 40½ 43
30 " 36 37 39 40

Hs.{Lord Ernest Hives - Chair}
  
  


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