. Factory and industrial management. 334 THE MOTOR BOAT. 335 sequent generation of heat clue to the combustion of the fuel causes asudden rise of pressure which amounts to an explosion. The ignitionis usually so timed that the maximum pressure is reached just as thepiston starts on its downward stroke. During the succeeding downward stroke, the products of combus-tion expand, driving the piston and giving the power to the the piston has reached nearly the end of the expansion stroke theexhaust valve opens, and the pressure within the cylinder rapidly fallsto that of the atmosphere,
. Factory and industrial management. 334 THE MOTOR BOAT. 335 sequent generation of heat clue to the combustion of the fuel causes asudden rise of pressure which amounts to an explosion. The ignitionis usually so timed that the maximum pressure is reached just as thepiston starts on its downward stroke. During the succeeding downward stroke, the products of combus-tion expand, driving the piston and giving the power to the the piston has reached nearly the end of the expansion stroke theexhaust valve opens, and the pressure within the cylinder rapidly fallsto that of the atmosphere, which it has practically reached when theexpansion stroke is completed. The cylinder is cleared during thenext up-stroke of the piston, and the following stroke begins the cycleonce more b\- drawing in a cbarije of fuel and DAiMi^EK /- AiNU 12-HUKSE-i0\VKK ilAKINE MOTOR. I^ORT SIDE. In the two-cycle engine the exhaust stroke and the suction strokeare eliminated by drawing the charge into a chamber enclosing thecrank, and called the crank case. On the up-stroke of the piston avacuum is formed in the crank case, drawing in a charge of fuel andair, which on the next down-stroke is compressed to about two to six 336 THE ENGINEERING MAGAZINE. pounds per square the piston is nearly attl^ bottom of its stroke, ituncovers a port leading tothe crank case and theslig-htly compressed chargerushes into the and expansionfollow, and just before theport to the crank is opened, aport on the opposite side ofthe cylinder is uncoveredthrough which the exhaustgases escape, and the freshcharge entering the cyl-inder is deflected towardthe head by a plate on thepiston and drives out thebalance of the exhaust. Theengine is therefore valve-less and receives an impulseat each revolution. For the pu
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
