Question 1

What Is Cylinder Block?

Accepted Answer

Cylinder blocks are a fixed, integral part of the crank mechanism hereinafter referred to as the KM, which connects the engine cylinders. It is made by casting from cast iron. Sometimes the cylinder block is cast from cast aluminum as well as magnesium alloys. In the cylinder block, the crankshaft is mounted on special supporting surfaces.

The upper part of the cylinder blocks is closed with the cylinder head. And the crankcase is attached to the bottom of the cylinder block. All major engine components are installed on or in the engine block. These components, including the cylinder holes, are machined very precisely.

They must be thinking enough to contain the pressures of the burning fuel mixture. Tight fit musts are ensured between the cylinder base and the piston rings to enable the piston rings to seals the combustible gas.

If the cylinders become oval due to wear, some gas is released through the piston rings. The gas leaking through the piston rings is called a blow-by. Blow-by reduces the efficiencies of an engine. Finishing on the cylinder walls also affects the ring seal.

Question 2

Materials of Cylinder Block and Liner:

Accepted Answer

Typically, manufacturers sometimes use gray cast iron for cylinder blocks when nickel and chromium are added. Nowadays, they also use aluminum to reduce weight and improve performance. However, aluminum blocks use cast iron or steel sleeves on the cylinder. Most engines prefer cast iron for the cylinder walls as it has fewer wear properties.

Some small engines use chromium for plating the cylinder walls to reduce wear and increase service life. Depending on the working volume & other technical and operational characteristics of the purpose, there are several layout options for the arrangement of the engine cylinders, as well as a number of materials for the manufacture of blocks and cylinders. Since different pressure conditions arise in the cylinder above the piston cavity, the inner surface of the cylinder wall is exposed to flame and hot gases, the temperature of which ranges from 1500-2500 °C; such a part must be high Made of high strength material with mechanical strength.

The sliding speeds of the piston rings on the cylinder walls are quite large, ranging from 12 to 15 m / s, so the rigidity in the inner walls of the cylinders must have increased. In this case, the services life of the cylinder line) will increase, & the part will be more resistants to various types of wear, abrasives, corrosive, and erosion. If the surface of the cylinder blocks has worn out beyond the permissible limit as determined by the cylinder block defects method, it is necessary to repair cylinder blocks.

Question 3

Composition of Cylinder Block:

Accepted Answer

The structure of the cast-iron cylinder block is as follows:

Iron 95%
Carbon 2.2%
Silicon 1.2%
Manganese 0.63%
Sulfur 0.12%
Phosphorus 0.85%

A typical aluminum alloy for the cylinder block and piston is specified below:

Aluminum 91%
Tin 2%
Copper 7%

Question 4

Construction of Cylinder Block:

Accepted Answer

In addition, the head is attached to the top surface of the cylinder block with studs/bolts. Gaskets are used between the head and the block to provide a seal to prevent leakage of gases. In addition, the block also has ports, oil passages, and water jackets carved inside it to provide lubrication and cooling. However, some cylinder blocks also have a camshaft and provisions for mounting the relevant parts. In addition, the L-head engine block also has openings for valves and valve ports.

Question 5

Functions of Cylinder Block:

Accepted Answer

The cylinder block is the main stationary body of an automobile engine and serves as the foundation. They serve as support and enclosure for the moving parts. Nowadays, the cylinder block and crankcase are cast together in a single casting, which gives a rigid structure.

The cylinder blocks may also have a separate crankcase for the crankshaft, which is mainly limited to larger engines and marine and stationary engines. A separate aluminum crankcase made of aluminum is preferred due to its low weight, cheap and quick replacement.

Question 6

Types of Engine and Cylinder Block:

Accepted Answer

Engine blocks are classified based on the configuration of the engine cylinders. The following are the types of engine blocks:

#1. V Engine Cylinder

This is the popular engine cylinder type and is widely used nowadays. In this configuration, the engines are arranged in two rows. The two lines are set at an angle to each other. The angles V is kept small, usually 15° to 20°, because the larger angle makes it more difficult to balance the engine. It is difficult to balance this type of engine with the counterweight on the crankshaft.

The crankshaft consists of only two cranks, in which the connecting rods from the opposing cylinders are connected to the same crankpin in two rows. Each of the two connecting rods is connected to a crankpin. There are different types of V engines; for heavy vehicles, V16s, V8s, and for small motorcycles, V4s are used as cylinder blocks.

#2. Opposed and Boxer Engine Cylinder

The Boxer engine is basically a flat pressed V engine. These cylinder blocks consist of two rows of two cylinders, each facing each other. This design is also known as a pancake engine. This requires very little headroom so that the engine compartment can be very compact. The Volkswagen engines have this type of arrangement of 4 cylinders. It is air-cooled and is mounted at the rear of the car. This engine block is also used on Porsche and Subaru, and some other higher engines.

#3. Inline Engine Cylinder

Inline engine cylinder block, series of the cylinders arranged in such a way that they run in a single line. Automobiles with this type of engine block work smoothly; This is the reason why they are mostly used where high rpm is required. It is mostly used in passenger cars.

Question 7

Problems of Cylinder Block:

Accepted Answer

External engine coolant leak:- This leak can be from the water pump, radiator, heater core, or a loose hose. Sometimes it can also be due to engine block due to cracks.

Worn/Cracked Cylinder:- After the cylinder has been in operation for a long time, wear inside the cylinder is a common phenomenon. This can damage the smooth machined wall. This affects the sealing by piston rings. These problems can be solved by increasing the bore size.

Porous Engine Block:- This engine block failure is usually caused by a contaminant entering the metal. This often happens during the manufacturing process. There is no solution to this problems because this problem is because the cylinder block originated from it.

What Is Cylinder Block? | Materials of Cylinder Block and Liner | Construction of Cylinder Block