Back Pressure when Exhaust Valve Opens Calculator

✖Gas Load on Exhaust Valve is the amount of force acting on the inner side of the exhaust valve due to the back pressure or cylinder pressure when the exhaust valve opens.ⓘ Gas Load on Exhaust Valve [P_g]			+10% -10%
✖Diameter of Valve Head is the diameter of the top part of valve of an IC engine, valve intakes and exhausts gases to and from an engine.ⓘ Diameter of Valve Head [d_v]			+10% -10%

✖Back Pressure on Engine Valve is the pressure exerted onto the valve when it opens.ⓘ Back Pressure when Exhaust Valve Opens [P_b]

⎘ Copy

👎

Formula

LaTeX

Reset

👍

Download Design of IC Engine Components Formula PDF PDF Image

Back Pressure when Exhaust Valve Opens Solution

STEP 0: Pre-Calculation Summary

Formula Used

Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2)
P_b = (4*P_g)/(pi*d_v^2)
This formula uses 1 Constants, 3 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Back Pressure on Engine Valve - (Measured in Pascal) - Back Pressure on Engine Valve is the pressure exerted onto the valve when it opens.
Gas Load on Exhaust Valve - (Measured in Newton) - Gas Load on Exhaust Valve is the amount of force acting on the inner side of the exhaust valve due to the back pressure or cylinder pressure when the exhaust valve opens.
Diameter of Valve Head - (Measured in Meter) - Diameter of Valve Head is the diameter of the top part of valve of an IC engine, valve intakes and exhausts gases to and from an engine.

STEP 1: Convert Input(s) to Base Unit

Gas Load on Exhaust Valve: 1680 Newton --> 1680 Newton No Conversion Required
Diameter of Valve Head: 50 Millimeter --> 0.05 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_b = (4*P_g)/(pi*d_v^2) --> (4*1680)/(pi*0.05^2)

Evaluating ... ...

P_b = 855616.974062029

STEP 3: Convert Result to Output's Unit

855616.974062029 Pascal -->0.855616974062029 Megapascal (Check conversion here)

FINAL ANSWER

0.855616974062029 ≈ 0.855617 Megapascal <-- Back Pressure on Engine Valve

(Calculation completed in 00.004 seconds)

You are here -

Home » Physics » IC Engine » Design of IC Engine Components » Rocker Arm » Mechanical » Force on Rocker Arm of Valves » Back Pressure when Exhaust Valve Opens

Credits

Created by Saurabh Patil

Shri Govindram Seksaria Institute of Technology and Science (SGSITS ), Indore

Saurabh Patil has created this Calculator and 700+ more calculators!

Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

Anshika Arya has verified this Calculator and 2500+ more calculators!

< Force on Rocker Arm of Valves Calculators

Back Pressure when Exhaust Valve Opens

LaTeX Go Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2)

Initial Spring Force on Exhaust Valve

LaTeX Go Spring Force on Rocker Arm Valve = (pi*Maximum Suction Pressure*Diameter of Valve Head^2)/4

Gas Load on Exhaust Valve when it Opens

LaTeX Go Gas Load on Exhaust Valve = (pi*Back Pressure on Engine Valve*Diameter of Valve Head^2)/4

Downward Inertia Force on Exhaust Valve as it Moves Upwards

LaTeX Go Inertia Force on Valve = Mass of Valve*Acceleration of Valve

Back Pressure when Exhaust Valve Opens Formula

LaTeX Go

Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2)
P_b = (4*P_g)/(pi*d_v^2)

Valve gear mechanism for a vertical engine with overhead valves

The camshaft is rotated by means of a belt drive from the crankshaft. As the camshaft rotates, the cam pushes the follower and the push rod upwards. The rocker arm is pivoted at its center by means of a fulcrum pin. When the right end of the rocker arm is pushed up by the push rod, the left end moves downward. This compresses the spring and pushes the valve rod down in the cylinder, thereby causing the valve to open. When the follower moves over the circular portion of the cam, the spring expands and closes the valve. The spring pushes the left end of the rocker arm upward. This causes the right end to move downward and keeps the follower in contact with the cam. It should be noted that the valve is closed by a helical compression spring.

How to Calculate Back Pressure when Exhaust Valve Opens?

Back Pressure when Exhaust Valve Opens calculator uses Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2) to calculate the Back Pressure on Engine Valve, Back pressure when exhaust valve opens is the pressure exerted onto the exhaust valve at the inner portion when it opens. Back Pressure on Engine Valve is denoted by P_b symbol.

How to calculate Back Pressure when Exhaust Valve Opens using this online calculator? To use this online calculator for Back Pressure when Exhaust Valve Opens, enter Gas Load on Exhaust Valve (P_g) & Diameter of Valve Head (d_v) and hit the calculate button. Here is how the Back Pressure when Exhaust Valve Opens calculation can be explained with given input values -> 8.6E-7 = (4*1680)/(pi*0.05^2).

FAQ

What is Back Pressure when Exhaust Valve Opens?

Back pressure when exhaust valve opens is the pressure exerted onto the exhaust valve at the inner portion when it opens and is represented as P_b = (4*P_g)/(pi*d_v^2) or Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2). Gas Load on Exhaust Valve is the amount of force acting on the inner side of the exhaust valve due to the back pressure or cylinder pressure when the exhaust valve opens & Diameter of Valve Head is the diameter of the top part of valve of an IC engine, valve intakes and exhausts gases to and from an engine.

How to calculate Back Pressure when Exhaust Valve Opens?

Back pressure when exhaust valve opens is the pressure exerted onto the exhaust valve at the inner portion when it opens is calculated using Back Pressure on Engine Valve = (4*Gas Load on Exhaust Valve)/(pi*Diameter of Valve Head^2). To calculate Back Pressure when Exhaust Valve Opens, you need Gas Load on Exhaust Valve (P_g) & Diameter of Valve Head (d_v). With our tool, you need to enter the respective value for Gas Load on Exhaust Valve & Diameter of Valve Head and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search