THE FLOW OF THE MIXTURE
Practical experience has proved that the gas flow into an engine is assisted at high speeds when the walls of the parts and passages are polished. One reason is that the petrol mixture is not a true gas but a mechanical mixture of petrol particles of varying size and air. In a small engine burning at 4000-4500 r.p.m. the mixture speed often exceeds 250 m.p.h., and, of course, the flow is of a pulsating character.
The main factor in endeavouring to secure a high volumetric efficiency is to ensure a uniform cross section right through the induction system, but even when this ideal is approximately secured it still seems worth while to polish the surfaces as demonstrated by practical results.
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Evening Post, Volume CXXIV, Issue 15, 17 July 1937, Page 26
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125THE FLOW OF THE MIXTURE Evening Post, Volume CXXIV, Issue 15, 17 July 1937, Page 26
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