The boys' book of engine-building; . less attention after it isstarted. The Parts of a Gas Engine.—There are fivemain parts to this gas engine and these are (i)the cylinder; (2) the piston with its connectingrod; (3) the crankshaft; (4) the flywheel and(5) the base. Then there are five auxiliary, or smaller, parts,but these are just as important as the main parts,in fact they are the very vitals of the these parts are: (1) the inlet valve; (2)the exhaust valve; (3) the camshaft and cam;(4) the timing gears, and (5) the igniter. The Cylinder.—This can be made of an ironpipe but it
The boys' book of engine-building; . less attention after it isstarted. The Parts of a Gas Engine.—There are fivemain parts to this gas engine and these are (i)the cylinder; (2) the piston with its connectingrod; (3) the crankshaft; (4) the flywheel and(5) the base. Then there are five auxiliary, or smaller, parts,but these are just as important as the main parts,in fact they are the very vitals of the these parts are: (1) the inlet valve; (2)the exhaust valve; (3) the camshaft and cam;(4) the timing gears, and (5) the igniter. The Cylinder.—This can be made of an ironpipe but it must be bored out true and it an inside diameter of 1 inch, make it 2%inches long and thread one end of it as shown inFig 71. Get a screw cap to fit it and drill a /4-inch holethrough the opposite sides of the wall, drill an-other %-inch hole through the center of the headof the cap and thread all of them to fit a %6-inchpipe. The first two holes are for the inlet andthe exhaust valves which let in the fresh gas and. to 1 1 1 ^ £ 1 1 >^tV s N\ /sdV? 1 \ viLis o/ ^ 8 1 CO 1 217 218 The Boys Book of Engine-Building let out the burned gases. The hole in the headof the cap is for the igniter. Drill a %-inch hole % inch back from the frontend of the cylinder and through the wall andthread it for an oil cup. These can be boughtready made with screw tops for 25 cents each. The Inlet and Exhaust Valves.—A simple wayto make both the inlet and the exhaust valves,if you havent a lathe, is to take a /46-inch elbowfor each one (see Chapter VI). Thread one of the ends on the outside and thenream it out to form a beveled edge as shown inFigs. 71 and 72, to form a seat, as it is a Vi 6-inch hole through the elbow forthe valve stem so that it will be exactly in thecenter of the end of the elbow that is beveledout. Make a valve head of a disk of soft steel Viqinch thick and % inch in diameter and bevel therim so that it will fit accurately in the beveledend of
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