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).
Tests on an exhaust heated throttle and the collection of liquid petrol.
| Identifier | ExFiles\Box 50\3\ Scan158 | |
| Date | 18th August 1921 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to Rg.{Mr Rowledge} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to EWT. for R.R. Inc. X4305 Hs{Lord Ernest Hives - Chair}4/LG18.8.21. X.4305 - EXHAUST HEATED THROTTLE. In connection with our tests on exhaust heated throttles, we have found it very useful and instructive to fix a glass bottle at each bend on our induction pipe to collect any liquid petrol which is passing into the cylinders. By this means we can see which cylinders are getting the most liquid petrol and in what quantity. The idea of this test was sent to us by OY. from Springfield. We attach to Mr. Royce's copy of this memo. a paper written by Mr. Dorris which describes the tests that were carried out in U.S.A. We arranged in our induction pipe a weir so that we have a better chance of collecting all liquid in the bottles. The tests with the bottles have proved very interesting and in shewing the difference on the road with a non-heated and exhaust-heated throttle and also varying degrees of exhaust heat. For instance, with normal mixture and the engine running full throttle with the speed reduced to 10 M.P.H. by the brakes, without heat on the throttle, in one mile we collect six teaspoonfuls of liquid in the bottles. If we run the same test with a temperature at the throttle of 140°C, we get less than half-a-teaspoonful in the bottles. Under ordinary conditions of running with the exhaust heated throttle, we collect practically no liquid petrol, after 200 miles, the total contd:- | ||