’ d' gas ‘inside.: If ‘mixture -were to be ignited the cylinder would explode. . The engine is capable of controlling that -explosion through the use of valves, hich allow gas to enter and xhaust to escape, ‘and a xpansion' ‘of gases, _ this. energy ‘In most . ‘engines, . : ‘cylinder contains: 1 exhaust valve. 1 intake valve SSF tf IS 7 at iA Nil Wo! NS L Ate woe All "HEE 1 piston with connecting rod HN There are 88,636 cars on the Narth Shore. How many cars did you work on - or sell last month? If your car adits on this page. every Car owner on the North Shore could see il Call display advertising 980-0511 ‘piston which, driven:by the.» tran> air fuel mixture. Each | connecting - -rod connects the piston to the crankshaft. This crankshaft . moves up to compress the air in the is the “backbone”—of—your engine. It is rotated at thousands of times per minute by the up and down motion of the pistons. ‘Astroke cycle ‘ Each up and down motion of the piston is called a stroke, most if not all, automobile engines require 4 strokes to complete one cycle. . “Bach series of 4 strokes results in 2 revolutions of the crankshaft. This cycle goes something like this. Intake: The intake valve (the one which allows the gas to enter the combustion chamber) opens, the piston moves down drawing in the INTAKE ns x Compression: Both valves are closed and the piston and gas mixture combustion chamber. COMPRESSION Power: With both valves still closed the piston up, and the air and“gas mixture com-— pressed, the spark plug sparks igniting the fuel causing an explosion of sorts, which forces the piston back down. Heart Fund At Crystal Glass we have glass for every purpose As well as sunroofs. we can handle any custom orders, including mirrors, tabletops. sxylites. picture glass. Autoplan claims We can heip you quickly and efficiently at any one of our tive locations = Swtall crags 152 Pemberton, North Van 980-4804 | 1O9Ob Maan Vancouver BC 679-6868 Gos Bless 68/5 au Hetle a wh ing shots Saattey 506-5102 King ( rae Vittwy B25 Agnes St Now West 8 C §26-1651 57H 2O4ASI Langoy 8 ¢ 630-6277 Exhaust: As the piston begins its journey back up, the exhaust valve opens and the piston pushes the burnt. | gas out. Then the intake valve opens and the piston - draws in the air-fuel mixture _and it starts all over again: © EXHAUST ‘These strokes ‘happen thousands of times per “minute. The connecting. rod transfers this up and down motion of the piston to the. the” rotary motion of crankshaft. This action is similar to the action of your legs as they pedal : a bicycle. This then is a very simple explanation of how one piston works to move your car. There are of course many different methods of achieving this end result and different methods of opening and closing the valves. CONTINUED ON PAGE 44 we ee ‘ews * seam é * ‘Pressure test& - cooling system _ analysis! “Classic & Thoroughbred We are pleased to offer the following fine motor cars for your consideration: 1975 BMW 5301. Auto, Ak, Leather, Sunroof Superb Condition 1977 L82 CORVETTE Excellent Condition 1978 HONDA ACCORD. | 5 Speed - As New 1978 SAAB TURBO ‘With P7 Tires | Low Mileage 1977 SAAB EMS Classic & Thoroughbred flotors Ltd. 740 Marine Drive, North Vancouver . D.L. No. 01288A. 984-0211 THE BRAKE DOCTOR includes inspection of all road test. one thing never business. els Stes ht Mech ® have 4 “ aft ME BObIemn ee PRESENTS Your Basic Brake Job from 747° (premium quality lining extra) relining front and rear brakes rebuilding wheel cylinders, machining drums, flushing bleeding hydraulic system, complete brake hardware and . hydraulic lines, adjusting parking brake and After 22 years experience, every kind of brake problém imaginable. But changes - guarantee is still the bottom line of our I've dealt with a personal North Van Auto Brake 1175 West 15th, N.V. (just off Pemberton) 985-8705 Open Mon. thru Fri.