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).
Letter detailing dynamometer tests on fuel condensation in an induction pipe and its effects on engine performance during cold starts.
| Identifier | ExFiles\Box 50\3\ Scan152 | |
| Date | 18th August 1921 | |
| X4305 CC Mr. Belnap Mr. Nadin Cyl - G 16821 August 18, 1921 Mr. Claude Johnson, Managing Director, Rolls-Royce Ltd., London, England. Attention; Mr. Royce & Works Committee. Dear Sirs:- Re: Parts on 4-HX - Induction Pipe Mr. Royce's letter R1/G17.6.21 has been replied to in my letters Cyl/G9621 (Att. Mr. Royce & Mr. Hives) and Cyl/G9721 (Att. Mr. Hives - copy Mr. Royce). COPY We have put a chassis on the dynamometer with an induction pipe with 1" through pipe having drain pipes leading down from each inlet bend into bottles. We have found it impossible to "load-up" this car so long as the bottles remain unfilled, and this in spite of the fact that the mornings are now quite cold so that we are beginning to get autumn conditions. We collect about 1/4 of a pint of fuel in the bottles, principally opposite Nos. 3 and 4, every time we start from cold. After the engine gets thoroughly warm, we collect little fuel whether heat is passing through the induction pipe or not; but occasionally one of the inlet bends will start collecting without any apparent reason and will collect perhaps an ounce of fuel and then as suddenly stop. Our fuel consumption in pounds per b.h.p. hour is unaffected by the presence of the bottles, even though the amount collected in the bottles is neglected. The power developed is unaffected. Nos. 1 and 6 collect practically no fuel under any conditions so far met with. We are about to put in hand distillation tests of the fuel collected in the bottles. The pulling of the engine immediately after a cold start is much improved, and misfiring and uneven behavior after a cold start is largely avoided when the bottles are filled. This is on the lines of Mr. Dorris' findings published in the | ||