Taper is the difference between the largest diameter at the top of the cylinder measurement and the smallest measurement at the bottom of the cylinder.
Ovality is cause by uneven pressure through the piston as it goes u and down in the cylinder.
Taper is caused by the piston ring as they rub against the cylinder wall.
Taper and Ovality are measured using a cylinder bore gauge, for taper you move the gauge up and down slowly and take the measurement at the top, middle and bottom, for ovality measure it just below the piston ring mark move it up and down slowly taking measurements and at 90 degree angles to each other
Piston side clearence is the space between the piston rings and the ring grooves.
The valves.
The difference between the intake and exhaust valves is that the intake valves are bigger to allow for less resistance and easier flow into the engine of the fuel.
The exhaust valves will reach temperatures 900 degrees celcius, the intake valve will reach around 250 degrees celcius .
The pistons in a four stroke engine must be able to with stand 300 degrees and must be able to cope with speeds of 30 meters/second(around 108kp/h) or around 7,500rpm
We have piston ring end gap clearance because the piston moves fast and generates alot of heat so the piston ring needs room to expand.
If the piston ring end gap clearance is too small then there isn't enough room for the the piston ring to expand.
Aluminium cylinder heads usually have a steel shim between the valve spring and cylinder head surface because the valve springs move at such a high speed that the could damage the aluminium cylinder head where as steel is alot stronger and can handle the pressure.
The term S.I means Spark Ignition.
The term C.I means Compression Ignition
The purpose of a core plug is to act as an expansion plug on the side of the block that protects the engine block when the water freeze's as water expands when it freeze's, this usually happens when there isn't enough anti-freeze in the water in a cold enviroment
The valves.
The difference between the intake and exhaust valves is that the intake valves are bigger to allow for less resistance and easier flow into the engine of the fuel.
The exhaust valves will reach temperatures 900 degrees celcius, the intake valve will reach around 250 degrees celcius .
We have piston ring end gap clearance because the piston moves fast and generates alot of heat so the piston ring needs room to expand.
If the piston ring end gap clearance is too small then there isn't enough room for the the piston ring to expand.
The term S.I means Spark Ignition.
The term C.I means Compression Ignition
The purpose of a core plug is to act as an expansion plug on the side of the block that protects the engine block when the water freeze's as water expands when it freeze's, this usually happens when there isn't enough anti-freeze in the water in a cold enviroment
Crankshafft run-out is how much the crankshaft itself is bent from when it was originally made we measure the crankshaft run-out with the D.T.I
How come Intake valves are bigger than exhaust valves ?. Normally exhaust valve are much bigger due to the fact that it can expel out more gas. Since the temperature varies in the ratio of 3:1, why the Intake must be bigger than Exhaust if Intake valve need less resistance?
ReplyDeletethe intake valves are larger as the unburnt gas has more volume than the burnt gas and that is why the exhaust valve is smaller it is also smaller so that back pressure can be maintained at the correct level in the exhaust piping
ReplyDeleteI like this information, its good.
ReplyDelete