A visual photographic study of cylinder lubrication

Shaw, Milton C Nussdorfer, Theodore
naca-report-850
1946


A V-type engine provided with a glass cylinder was used to study visually the lubrication characteristics of an aircraft-type piston. Photographs and data were obtained with the engine motored at engine speeds up to 1000 r.p.m. and constant cylinder-head pressures of 0 and 50 pounds per square inch. A study was made of the orientation of the piston under various operating conditions, which indicated that the piston was inclined with the crown nearest the major-thrust cylinder face throughout the greater part of the cycle. The piston moved laterally in the cylinder under the influence of piston side thrust.

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http://naca.central.cranfield.ac.uk/reports/1946/naca-report-850.pdf