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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 tests for a 'Bensport' car, including temperature and acceleration data after engine modifications.

Identifier  ExFiles\Box 82\1\  scan0065
Date  25th March 1933
  
To Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}
From GWH.{George W. Hancock - Head Chateauroux}

E
By
Seen By

hotel de France
Chateauroux
Indre
25.3.33.

B E N S P O R T.

The car is running very well with the N°5 piston fitted and the copper asbestos joint washer. The compression ratio being reduced there is now no sign of detonation. We have carried out the following tests:

RUN OF 12 MILES EACH TEST.

Front timing case lagged Radiator shutter held open.

M.P.H. AIR OIL WATER
60 10°C 67°C 43°C
70 10°C *73°C 45°C
80 10°C 76°C 45°C

Lagging removed from timing case Radiator shutter held open.

M.P.H. AIR OIL WATER
60 12°C 62°C 41°C
70 12°C 71°C 46°C
80 13°C 77°C 50°C

Acceleration Tests cutout closed

MPH SEC MPH SEC
10-20 5 10-20 5
10-30 8 2/5 20-30 4 3/5
10-40 13 30-40 3 1/5
10-50 18 2/5 40-50 5 2/5
10-60 23 50-60 5
10-70 31 4/5 60-70 7 2/5
10-80 44 4/5 70-80 11

10-80 through gears 38 sec.

Brooklands figures taken from log book.

MPH SEC
10-40 12.6
10-60 23.2
10-80 43.4
10-60 through gears 15.6 sec.
  
  


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