Bulletin . ther cycle so lar asthe cylinder functions are concerned. For example, Figure3 indicates an engine that does not have as many valves asthe others we have examined but it has something in place of them. It is a two-cycle engine, so called because it cancarry out all the necessary series of cylinder operations intwo strokes instead of four. This is done by utilizing theother end of the cylinder, which in a single acting four-cycle engine is idle, or what is the same thing, by utilizinga closed crank case, or what is likewise equivalent in vervlarge engines by adding pumps, one for air
Bulletin . ther cycle so lar asthe cylinder functions are concerned. For example, Figure3 indicates an engine that does not have as many valves asthe others we have examined but it has something in place of them. It is a two-cycle engine, so called because it cancarry out all the necessary series of cylinder operations intwo strokes instead of four. This is done by utilizing theother end of the cylinder, which in a single acting four-cycle engine is idle, or what is the same thing, by utilizinga closed crank case, or what is likewise equivalent in vervlarge engines by adding pumps, one for air and one forgas. The lunction of these pumps or the crank case, orthe forward end of the cylinder if closed, is to get readythe mixture so that it can be putf ed into the cylinder duringa portion of the stroke without using up a whole to the hgure it will appear that the piston isfitted with a lip G which in the position shown is justunderneath a slot in the cylinder marked I, communicating. Fig L RE 3. with the passage B, C, D, to the forward end of the cylin-der and communicating likewise at the bottom of B withan inlet valve A. Tliis inlet valve is of the automatic sortiiaving no cams to open it. Just at the bottom of the cyl-inder there is another slot connecting with the exhaust pipemarked E. Imagine the piston to move to the left, thenwhatever is in the cylinder wlien the piston covers the slotsor ports, I and E, will be compressed. At the same timethere will be a suction in the chamber B and C and liftingthe valve A, allowing mixture to follow in behind thepiston in the chamber D while the compression is going onto the left. When this compression is all over, the igniter,placed at F, will tire the charge, the piston will move tothe right expanding the hot gases on the left hand side andcompressing the mixture on the right hand side in D, C, B. When the piston has reached the point of uncovering E,the high pressure hot gases will rush out through theexhau
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Keywords: ., bookce, massachusettsinstituteoftechnology, steamengineindicator
