What do piston do in a car?
A piston draws air into the cylinder through an intake port. The intake valve closes and the air/fuel mixture compresses as the piston moves back up. Once the mixture is fully compressed, it is ignited and explodes forcing the piston down (this is known as the power stroke). An exhaust valve opens and the burned gases are expelled out of the cylinder as the piston moves back up to complete its cycle.
This is different from a heart valve. A heart valve would be similar to a bicycle tire pump though. As the piston draws air into the air chamber,the valve opens to allow the air to fill the chamber. the piston then, changes direction and pushes that valve closed and opens another valve to allow the air to be pushed out the air line. The difference is in the valves. a bicycle pump uses check valves. Check valves allow flow in one direction.
The bottom of the piston is connected to the crankshaft. This is what is moved by the piston. The top of the piston is a chamber in which gas is ignited to push the piston down. There are 4 cycles in most engines (like car engines.) If you want to know more, including specifics, go to: http://en.wikipedia.org/wiki/Four-stroke_engine
burning fuel in the cylinder gets hot and expands the expansion pushes against the piston the piston moves pushing on the piston rod the piston rod moves pushing on the crankshaft eccentric the crankshaft eccentric rotates the crankshaft the rotations of the crankshaft pass through the transmission to the wheels to move the car.
Car engines burn fuel in cylinders. When the fuel burns the air in the cylinders expands. The expanding air pushes down on a piston. The piston pushes down on a crankshaft. Then the piston comes back up. The piston going down and up makes the crankshaft rotate. This rotating motion is transferred to the wheels of the car. That pushes the car along. Thus the fuel burning in the cylinders pushes the pistons. Without Petrol…
What happens in the brake system of a car from the time a driver steps on the brake pedal to the time the car stops?
First the driver puts pressure in the foot brake, which then pushes a small piston, the piston then exerts pressure in the brake fluid. Then the increased pressure is transmitted through the fluid in the brake lines to a larger piston within the wheels of the car. Each piston pushes in a brake pad which the rubs against the brake disc, and the wheels motion is slowed down by the force of friction.
piston slap is when the piston inside the cylinder is somewhat smaller than the cylinder bore. when the piston moves up and down, it ends up moving side to side too. this causes a knocking/slapping sound as the piston slams into the cylinder walls. this can cause harm if the play between the piston and bore are significant, otherwise it's nothing to worry about. if the car is hammering you might want to take it…
Worn piston rings will cause your car to burn oil. It will smoke, and you'll have to add oil frequently. Additionally, the performance will fall off as compression is lost past the worn rings. There may be a "slapping" sound as the piston skirts slap the cylinder walls, and this will occur in cases of advanced ring wear.
Out of car method. Remove the head and sump Undo the con rods from the crank, then slide the con rod & piston out. In car method. Drain the coolant Remove the cylinder head(s) Raise the car. Drain the oil Remove the sump. Undo the con rods from the crank. Push up the piston and con rod assembly. On some vehicles it is not possible to remove the sump in situation. A good home workshop…
The piston has the same function whether diesel or petrol. The piston is forced down the cylinder when the petrol mixture ignites and expands. That in turn presses on the connecting rod which in turn pushes on the crankshaft. The crankshaft changes the up and down movement of the piston into a rotational movement which makes the car go.
Seems to me the valve guide seats are worn. these are small angular sleeves that fit between the valve stem and the head(guide), if they are worn, this allows for oil to seep down thru your valves and onto your piston,when the piston fires, it not only burns the gas, but the oil that has seeped onto the piston,replacing them, the head needs to be off of the car.