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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).
Fuel consumption tests for the 1.EX car, comparing different axle and compression configurations.

Identifier  ExFiles\Box 29\3\  Scan109
Date  16th September 1922
  
To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c. to CJ. and BJ.
c. to E.{Mr Elliott - Chief Engineer}
c. to Da.{Bernard Day - Chassis Design}
c. to EY.

X788

hs{Lord Ernest Hives - Chair}3/LG16.9.22.

X788
X3763

CONSUMPTION TESTS TAKEN ON 1.EX CAR.

Comparative tests were taken on this car over the same roads and under the same conditions comparing the 14/15 tooth axles. The car was driven normally and the carburetter adjusted to obtain the minimum consumption.

The tests show that with a 15-tooth axle high compression (23¾) the consumption was 15½ miles to the gallon - with a 14-tooth axle the consumption was 14½ miles to the gallon

Tests taken on 1.EX Car with a 15-tooth axle with high compression (23 cu.ins.) and medium compression (26 cu.ins. otherwise similar conditions, the miles per gallon with high compression (23¾) was 16 M.P.G. - with the medium compression (26) it was 15 M.P.G.

We consider from the average of all our tests that the present standard medium compression car fitted with a 14-tooth axle will consume approximately 7/8% more petrol than the high compression (23¾) fitted with a 15-tooth axle.

Hs.{Lord Ernest Hives - Chair}
  
  


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