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Smoke levels
Page 58
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A Leyland technical spokesman told me that specifying the gross rating of a unit is greatly preferable to giving the net output: it eliminates discrepancies arising from differences in auxiliaries employed and total power they absorb.
Leyland states that the smoke levels governing the new gross ratings represent an entirely new range of levels based individually on engine size. No details of these levels are available.
A gross rating that is lower than the previous net rating, or is equal to it, indicates that there has been a reduction in useful output to achieve the new smoke level.
Examples of the new ratings include a ,rating of 57.5 b.h.p. for the Leyland 0.160 engine, which had a net rating of 60 b.h.p.; 151 b.h.p. for the AEC 505 (154 b.h.p. net).