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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).
Induction pipe tests of the 'Dorris scheme' for vaporizing petrol which clings to the pipe walls.

Identifier  ExFiles\Box 50\3\  Scan180
Date  1st September 1921
  
X4305

To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c. to CJ.
c. to E.{Mr Elliott - Chief Engineer}
c. to Rg.{Mr Rowledge}
c. to Da.{Bernard Day - Chassis Design}
c. to BY.{R.W. Bailey - Chief Engineer}
c. to EP.{G. Eric Platford - Chief Quality Engineer}
c. to EWT. for R.R. Inc.

Hsl/LG1.9.21.

X.4305 - INDUCTION PIPE TESTS.

After a number of tests, we have come to the conclusion that the Dorris scheme of collecting the heavy ends of petrol which cling to the walls of the induction pipe and run them back on to the real hot spot to be vapourized, is a very excellent scheme and one which lends itself very conveniently to our design of induction pipe and exhaust system. We have fitted this scheme up on a 40/50 engine. The sketch below shows how it was carried out. On our tests we arranged a glass gauge tube in each reservoir on the exhaust pipes so that we could see the quantity of liquid petrol which was collected and under what condition of running it was collected and also how long it took to boil away. We found that starting up cold was the very worst condition and according to how cleverly the Pilot Jet was used, governed the amount of liquid petrol which was collected. Frequently, when starting up, the reservoirs were three-parts full. As soon as the engine was running and it was run up by the hand control, the petrol commenced to boil in the reservoirs and in a very short time all signs of liquid petrol had gone. When once the engine was at normal temperature we found that no liquid petrol is collected in the reservoirs. One could notice when running full power 500 revs. full throttle, (which is the worst condition for loading up) that a fog vapour could be seen
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