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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).
Temperature and carburation tests conducted under various driving conditions.

Identifier  ExFiles\Box 94\3\  scan0117
Date  8th December 1936
  
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(a) Touring conditions.

(b) Full speed conditions.

(c) Dense traffic conditions.

The corresponding tests were carried out on the same pieces of road at similar speeds (and as far as possible under similar conditions of weather etc.) on 36-EX car (this car has the latest standard MK.VI matrix and a standard "flip-flap" bonnet - "flip-flaps" closed during tests.) Temperatures were recorded at the following points:-

(1) In neighbourhood of petrol pump body.

(2) Directly behind fan.

(3) In petrol supply pipe close to pump.

(4) At rear of cylinder head - standard thermometer pocket position.

(5) Atmospheric temperature in front of car.

(B) A P.III car was fitted up with by-pass thermostats in the top water pipes and the shutters were fixed open - this gave a water running temperature of, approximate-ly 70°C - the carburation with this system was then compared with a standard car.

Results of Tests.

(A) Under-bonnet temperatures - these are shown in attached sheet, and are all reduced to a common atmospheric temperature of 10°C.

(B) Carburation. When the first comparison between the by-pass control system and the shutter control system was made, the atmospheric temperature was, approx-imately, 10°C. Under these conditions no difference could be detected in the carburation at any speed (the minimum air intake temperature was 30°C while the average was 34°C under cruising conditions.) The test was repeated, however, on a day when the air tempera-ture was -1°C. Under this condition a very slight weakness of mixture could be detected when snap opening the throttle from low speeds, i.e. 10-15 m.p.h. in top gear - however this was slight enough not to be notice-able unless one were looking for the fault, once the engine was thoroughly warmed up.
  
  


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