Strangeasitmayseem，multiplicityofcylindersdoesnotalwaysaddproportionateweight.Becausea4—
cylindermotorweighssay100pounds，itdoesnotnecessarilyfollowthatan8—cylinderequipmentwillweigh200pounds.Thereasonofthiswillbeplainwhenitisunderstoodthatmanyofthepartsessentialtoa4—
cylindermotorwillfilltherequirementsofan8—cylindermotorwithoutenlargementoraddition.
Neitherdoesmultiplyingthecylindersalwaysincreasethehorsepowerproportionately.Ifa4—cylindermotorisratedat25horsepoweritisnotsafetotakeitforgrantedthatdoublethenumberofcylinderswillgive50horsepower.Generallyspeaking，eightcylinders，thebore，strokeandspeedbeingthesame，willgivedoublethepowerthatcanbeobtainedfromfour，butthisdoesnotalwaysholdgood.Justwhythisexceptionshouldoccurisnotexplainablebyanyacceptedrule.
HorsePowerandSpeed.