The Piston Compression Height is the distance between the piston head and the deck surface of the engine block. This height can be determined by measuring the length of a line drawn from the center of the top of the piston hole to the bottom of the hole. This number will be twice the amount of travel required for the compression release mechanism to activate.

For example, if the requirement was 100 mm (4 inches) of travel, then the compression height would be 200 mm (8 inches).

Compression heights vary depending on how the engine is built. If you look at any engine diagram, you will see that most have their pistons mounted in **cylindrical bores** with a flat spot where they meet the wrist pin. This is called the crown area. The compression height depends on what size piston you use. Smaller pistons require **shorter compression heights** while larger ones need longer strokes to provide **enough force** for which to open the valve at top dead center.

As an example, if you used.070-inch diameter pistons in **a 4.10-inch bore**, the total volume of the cylinder would be 0.70 x 4.10 x 52 = 92.4 cubic centimeters (cc).

A car's engine capacity, often known as displacement, is the total volume of all its cylinders. The piston has a displacement of 62.8 cubic inches. This means that the engine can pump 7.568 gallons of water per revolution of the crankshaft.

The figure you are looking for is called displacement volume. It is the amount of space the piston takes up when it is at the top of **its stroke**. In **this case**, it is 62.8 cubic inches.

Piston displacement volume is very important because it tells us how much air and fuel can be contained in the cylinder when the engine is at full load. If we had a small-displacement engine, it would be able to sustain full load for only a few seconds before running out of air. But since our engine has a large displacement, it will be able to run at full load for much longer periods of time.

In addition to telling us how much air and fuel can be contained in the cylinder, displacement volume also affects **sound production**. Smaller engines tend to be less loud than larger ones because they have **more efficient combustion cycles**. Less material needs to be moved around inside the engine as well because there's not as much pressure required to push the pistons around.

The quantity of work done is equal to the product of the force applied to the piston multiplied by the distance travelled by the piston. The pressure (P) exerted by the gas on the piston is equal to the force (F) exerted by the gas on the piston divided by **the surface area** (A) of the piston. If we assume that the piston is a sphere with **radius r**, then the surface area is 4*r^2."

The work can be found by multiplying the force applied to the piston by its distance travelled. So, if we assume that the force applied to the piston is given by F and its distance travelled is d, then the work done by the piston is Fd.

In our case, the force applied to the piston is given by P0Rt where R is the radius of the cylinder and t is the time taken for the piston to travel from its top dead center position to **its bottom dead center position**. Now, let's say that R = 1 cm and t = 5 cm. We would then have **P0 = 15 psi**. Since distance × force is constant, we can say that the work done by the piston is equal to P0(5 cm)2. This equals 75 joules.

So, work is defined as the product of force and displacement. In our case, the work done by the piston is 75 joules.