Nominal and Developed H.P.
MOTORISTS are sometimes perplexed by the relationship of the nominal horsepower of an engine to its cylinder capacity. In many instances, the best indication of the probable power output is the capacity. The customary formula, used to determine nominal horsepower ignores the stroke of the pistons, and in countries Where registration. ta;x is based (Silt rated horsepower there has naturally been a tendency for manufacturers lo increase the stroke in proportion to the bore, so as to secure greater power without incurring a higher flat-rate of taxation. According to The Motor, the average engine will develop about. 2 h.p. for every 100 e.c. capacity; in other words, the output of a 2000 c.e. unit, for example, should bo about 40 b.h.p., but that ratio cannot 1)0 applied universally since racing engines, specially tuned jobs, or supercharged types may give a superior performance.
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Bibliographic details
Poverty Bay Herald, Volume LXI, Issue 18503, 15 September 1934, Page 9
Word Count
146Nominal and Developed H.P. Poverty Bay Herald, Volume LXI, Issue 18503, 15 September 1934, Page 9
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