FRICTIONAL LOSSES IN INTERNAL COMBUSTION ENGINES. 497 
THE DISTRIBUTION OF FRICTIONAL LOSSES IN 
INTERNAL COMBUSTION ENGINKS.? 
By H. P. TAYLOR, B.E. 
(Communicated by Professor 8S. H. BarracLouGs.) 
[Read before the Royal Society of N. S. Wales, December 2, 1914. | 
1. Introductory.—Though a great deal has been published 
concerning the friction of steam engines, very little seems 
to have been written on the subject of Internal-Combustion 
Engine Friction. Apart from certain investigations carried 
out at the University of Sydney,* the writer could find no 
record of any attempt to separate the total friction of such 
an engine into its component parts; that is, the friction at 
the main bearings, connecting-rod bearings, piston, layshaft 
and valve gear, and the frictional resistance of the gas 
through the valves and passages. 
An interesting account of experiments made on a 12 H.P. 
gas engine by Professor C. H. Robertson is given in the 
“Transactions of the American Society of Mechanical 
Engineers,”’ 1902, Vol. xxiv. Noattempt was made in this 
case to separate the component frictions, but from curves 
obtained it was shown how the total power lost in friction 
varied with different factors such as speed, power, tem- 
+ This research was carried out by the author in the Mechanical 
Engineering Laboratory of the University of Sydney during his tenure 
of Science Research Scholarship given by the Government of New South 
Wales, 1913-14. The author desires to record his great indebtedness to 
Professor 8. H. Barraclough, for much valuable advice, and for the 
assistance rendered him by the Engineering Staff at the University, 
and particularly for the personal assistance of Mr. B. S. Dowling during 
part of the research. 
2 Report to the Engineering Seminar by Mr. W. J. Sachs, on the 
results of some experiments made on a 40 H.P. National Gas Engine. 
Fr—December 2, 1914. 
