Self-propelled vehicles; a practical treatise on the theory, construction, operation, care and management of all forms of automobiles (1906)
Homans, James E. (James Edward), b. 1865 · New York, T. Audel & Company · leaf 187
y ports closedby poppet or mushroom valves, held in position bysprings. The exhaust valve is positively operated by camsgeared to the main shaft; the feed valve is generally operated bysuction of the piston, although some motors have it also posi-tively geared. Another important function in a gas… … Fig. 137.—Section through a typical Trunk Piston for a Gasoline Engine. Around the cir-cumference, near the rear end, are three circular grooves for inserting the packingrings. Through the central diameter is a perforation for admitting the piston pin,which is held in place by square-headed…
Automobiles
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