A Power stroke: When the piston reaches a point just before top dead center, the spark plug ignites the fuel mixture.

When the piston moves further down and the cylinder doesn't have anymore gases, fuel mixture starts to flow to the combustion chamber and the second process of fuel compression starts.

Operation: When the piston moves from bottom dead center ( BDC ) to top dead center ( TDC ) the fresh air and fuel mixture enters the crank chamber through the intake port.

When the piston is at bottom dead center, the burnt gases escape from the exhaust port.

When carburetors are used in aircraft with piston engines, special designs and features are needed to prevent fuel starvation during inverted flight.

When hydraulic pressure from the master cylinder acts upon the piston cup, the pistons are pushed toward the shoes, forcing them against the drum.

When the brakes are not being applied, the piston is returned to its original position by the force of the brake shoe return springs.

When the brake pedal of a modern vehicle with hydraulic brakes is pushed, ultimately a piston pushes the brake pad against the brake disc which slows the wheel down.

When the regulator valve V was opened, steam was let out of the boiler filling the space in the cylinder beneath the piston.

When a valve on the pipe was opened, the vacuum in the condenser would, in turn, evacuate that part of the cylinder below the piston.

When the piston, propelled by steam, reached the top of the cylinder, the steam inlet valve closed and the valve controlling the passage to the condenser opened.

When he soon improved the device by removing the poppet valve action, these three components became the piston valve, the slide valve, and the graduating valve.

When starting the engine, compressed air is admitted to whichever cylinder has a piston just over top dead center, forcing it downward.

When the rules prohibiting vertical pistons were lifted, bugles received two vertical piston valves.

When the barrel recoiled, the piston was pulled back by the barrel's recoil and thus pushed the oil through a small orifice and into a second cylinder placed underneath.

When the valve seat drops out of the cylinder head, it falls into the cylinder and damages the piston and cylinder head.

When the mainstage signal was received, pneumatic pressure was applied against the gas generator control valve actuator assembly which moved the piston and opened the fuel poppet.

When an automotive timing belt is replaced, care must be taken to ensure that the valve and piston movements are correctly synchronized.

When Watt sent someone to make a sketch of how this new engine worked, he discovered that the steam was condensed under a second piston and this was then pushed down when fresh steam entered the cylinder, forcing out the condensate.

When triggered by pressing a button, the piston springs up, creating suction that sucks the solder off the soldered connection.

When a compression release engine brake is active, a valve releases the pressure from the cylinder before the piston starts back down, so the slowing effect is present on the up stroke, but no accelerating effect is present on the down stroke and the net effect is the vehicle slows down.

When the throttle is closed, the relative manifold pressure drops below atmospheric pressure and the resulting pressure differential operates the blowoff valve's piston.

When an engine starts its exhaust stroke, the piston moves up the cylinder bore, decreasing the total chamber volume.

When the pressure behind the piston is released the piston is pushed back by the force of the pressure from the input.

When disruptive change has penetrated to the third level of social order, the process of disruption rapidly reaches a point of no return.

When a person has thoughtlessly or deliberately caused us pain or hardship it is not always easy to say, `` Just forget it ''.

When a city has arranged things like this you cannot easily change them.

When mold has more than one design cavity, make individual paper patterns.

When the resin has hardened, mix up another batch with a pigment added if you wish.

When the whole bottom has hardened, use a disk sander to feather the edges of the cloth at the keel line and near the spray rail.

When we look at countries like Iran, Iraq, Pakistan, and Burma, where substantial progress has been made in creating a minimum supply of modern men and of social overhead capital, and where institutions of centralized government exist, we find a second category of countries with a different set of problems and hence different priorities for policy.

When the information cell for Af has been determined, it is saved as a representation of Af.

) When the complete file has been read, the grammatical descriptions for all text forms found in the dictionary have been stored in the W-region ; ;

When a word represents a larger construction of which it is the only expressed part, it normally has more stress than it would have in fully expressed construction.

When ity is added, real clearly has two syllables.

When dealing with the actual relation of philosophy to the sociology of knowledge, or better the role of philosophy in assisting research on the social sources of ideas, one has to become necessarily selective.

When all has been said, however, the big branch store remains a major break with history in the development of American retailing.

When all of the rinse water has passed from the reservoir to the tubs the main drains are lowered to permit complete draining of the tubs.

When this water level has been reached, inject steam into the wheel until the temperature reaches that shown in Column B of Table 2.

When this water level has been reached, inject steam until the temperature is that shown in Column Aj.

When this water level has been reached inject steam until the temperature is that shown in Column Aj.

When the policy has been chosen, the state of the product can be obtained from the state of the feed by repeated application of the transformation ( 1 ) ; ;

When Af has been found it may be transferred into the storage location of Af and the whole calculation repeated.

When they do that my wife has to drive me to work in the big car.

When that fear has been removed by faith in Jesus Christ, when we know that He is our Savior, that He has paid our debt with His blood, that He has met the demands of God's justice and thus has turned His wrath away -- when we know that, we have peace with God in our hearts ; ;

" When the tone poem moves into the blues, " our American friend ... has succumbed to a spasm of homesickness.