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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 data for vehicle 12-GIV at Brooklands, comparing S.U. and Standard carburettors.

Identifier  ExFiles\Box 29\3\  Scan341
Date  13th August 1931
  
To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from F.Dodd.

Y788.

13.8.31
X.788.
X.1487.
X.7080.

12-GIV AT BROOKLANDS.

S.U. Carburetter - louvred bonnet (cut out closed).

| Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap mile Time | 1/2 Lap mile Speed MPH. |
|---|---|---|---|---|---|
| 21° | 75° | 2-12 | 75.12 | 24 secs. | 73.17 |
| 21° | 75° | 2-12 | 75.23 | 24 " | 75 |

S.U. Carburetter - louvred bonnet (cut out open).

| Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. |
|---|---|---|---|---|---|
| 20.5° | 70° | 2-10 | 76.27 | 23.4 | 76.92 |
| 20.5° | 73° | 2-10 | 76.62 | 23.4 | 76.92 |

Standard Carburetter - louvred bonnet (cut out closed).

| Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. |
|---|---|---|---|---|---|
| 19.5° | 73° | 2-18 | 71.97 | 24 secs. | 75 |
| 19.5° | 72° | 2-17 | 72.49 | 23 " | 75 |
| 19.5° | 72° | 2.17 | 72.49 | | |

Standard Carburetter - louvred bonnet (cut out open).

| Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. |
|---|---|---|---|---|---|
| 19.5° | 73° | 2-15 | 73.35 | 23 secs. | 77.25 |
| 19.5° | 73° | 2-15 | 73.45 | 23 " | 77.25 |
  
  


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