[Illustration: FIG. 71.—DIAGRAM OF VALVE SETTING.]
Air, 1, 41, 42, 46, 87, 89, 114 — carburetted, 42, 97 — lock, 72 — pump, 50 — — hand, 50 — scavenging, 16, 35, 84, 85, 87, 88, 89 — to petrol ratio, 42 — valve, automatic extra, 43, 49 — velocity, 46, 70 — volume of, relative to petrol vapour, 42, 108 — weight of, relative to petrol vapour, 42
Armature of magneto, 52, 54 — relative speeds of engine and magneto, 54, 55
Automatic extra-air valve, 43, 49 — inlet valve, 82, 84, 88
Balance, perfect, 76 — want of, 75, 76 — weight, 25
Burning, rate of, of mixture, 1, 57 — of deflector, 91
Carbon brush, 53, 55, 116 — deposit, 63, 78
Carburettor, 5, 8, 42, 82 — jet type, 42 — multiple jet, 47, 94 — points of a good, 49 — recent improvements in, 47 — spray type, 42 — surface type, 42 — wick type, 42
Circulation, forced, 71 — local, 73 — pump, 71 — thermo-syphon, 69
cylinder walls, 17 — of valve tappet, 29 — space, 4, 105, 107
Coil ignition, 57, 59, 61 — — system, wiring diagram for, 61 — non-trembler, 59 — supplementary, for starting, 58 — trembler pattern, 57, 61
Compression, meaning of, 3 — pressure, 82, 83, 105 — stroke, 6, 80
Connecting rod, 4, 21, 96 — — forces acting on, 20 — — phosphor bronze, 20, 22 — — steel, 23
Contact breaker, low tension, 53 — — wipe form of, 58 — screws, platinum tipped, 53, 57
Crank chamber, 8, 39 — — gas-tight, 81, 82, 96 — cheeks or webs, 24 — motor-cycle, 23 — pin, 24 — radius, 4 — shaft, 23, 28, 77, 89
Crank shaft, balancing the, 25, 76 — — vibration of, 76 — — whipping of, 76
Cycle, four-stroke, 5 — motor, 10, 11 — Otto, 5 — two-stroke, 80
Cylinder, 5, 9 — aeroplane engine, 15, 16 — air-cooled, 11, 15 — barrel, 12 — built-up, 16 — castings, 11 — head, detachable, 32, 78 — jackets, 12, 15, 69 — L-headed, 16 — pump, 87, 88, 107 — revolving, 10 — T-headed, 15 — water-cooled, 8, 32, 82, 96 — working, 81, 87, 107
Cylinders, cast _en bloc_, 16, 77 — cast in pairs, 16 — cast separately, 16 — choosing the number of, 75 — firing order of, 60
Defective coil, 114, 116 — ignition system, 114 — magneto, 114, 116 — sparking plug, 113, 114 — valve, 113, 114, 116
Deflector, 81, 87, 93, 96 — overheating of, 84, 91
Description of a typical petrol engine, 8
Diagram, indicator, 92, 102 — for four-stroke engine, 105 — for two-stroke engine, 106 — for valve setting, 116 — work, 103