Length of Piston Skirt given Side Thrust Calculator

✖Side thrust on piston is the perpendicular force acting onto the piston perpendicular to the piston central axis.ⓘ Side thrust on piston [F_a]			+10% -10%
✖Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them.ⓘ Bearing Pressure for Piston Skirt [P_b]			+10% -10%
✖Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.ⓘ Diameter of Cylinder Bore [D_i]			+10% -10%

✖Length of piston skirt is the total length of a piston skirt used for bearing side thrust.ⓘ Length of Piston Skirt given Side Thrust [l_s]

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Formula

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Length of Piston Skirt given Side Thrust

Formula

`"l"_{"s"} = "F"_{"a"}/("P"_{"b"}*"D"_{"i"})`

Example

`"175.6944mm"="12.65kN"/("0.4N/mm²"*"180mm")`

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Length of Piston Skirt given Side Thrust Solution

STEP 0: Pre-Calculation Summary

Formula Used

Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore)
l_s = F_a/(P_b*D_i)
This formula uses 4 Variables

Variables Used

Length of Piston Skirt - (Measured in Meter) - Length of piston skirt is the total length of a piston skirt used for bearing side thrust.
Side thrust on piston - (Measured in Newton) - Side thrust on piston is the perpendicular force acting onto the piston perpendicular to the piston central axis.
Bearing Pressure for Piston Skirt - (Measured in Pascal) - Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them.
Diameter of Cylinder Bore - (Measured in Meter) - Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.

STEP 1: Convert Input(s) to Base Unit

Side thrust on piston: 12.65 Kilonewton --> 12650 Newton (Check conversion here)
Bearing Pressure for Piston Skirt: 0.4 Newton per Square Millimeter --> 400000 Pascal (Check conversion here)
Diameter of Cylinder Bore: 180 Millimeter --> 0.18 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

l_s = F_a/(P_b*D_i) --> 12650/(400000*0.18)

Evaluating ... ...

l_s = 0.175694444444444

STEP 3: Convert Result to Output's Unit

0.175694444444444 Meter -->175.694444444444 Millimeter (Check conversion here)

FINAL ANSWER

175.694444444444 ≈ 175.6944 Millimeter <-- Length of Piston Skirt

(Calculation completed in 00.004 seconds)

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Created by Saurabh Patil

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

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< 8 Piston Skirt Calculators

Length of Piston Skirt given Allowable Bearing Pressure

Go Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt)

Side Thrust on Piston

Go Side thrust on piston = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore^2*Maximum Gas Pressure inside Cylinder/4

Length of Piston Skirt given Side Thrust

Go Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore)

Side Thrust on Piston Skirt

Go Side thrust on piston = Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore*Length of Piston Skirt

Total Length of Piston

Go Length of Piston = Width of Top Land+Length of Ring Section of Piston+Length of Piston Skirt

Minimum Length of Piston Skirt

Go Length of Piston Skirt = 0.65*Diameter of Cylinder Bore

Maximum Length of Piston Skirt

Go Length of Piston Skirt = 0.8*Diameter of Cylinder Bore

Maximum Total Length of Piston

Go Length of Piston = 1.5*Diameter of Cylinder Bore

Length of Piston Skirt given Side Thrust Formula

Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore)
l_s = F_a/(P_b*D_i)

Piston Skirt

The cylindrical portion of the piston between the last scrapper ring and the open end is called the piston skirt. The piston skirt acts as a bearing surface for the side thrust. The length of the skirt should be such that the bearing pressure due to side thrust is restricted to 0.2 MPa on the projected area. In high-speed engines, the bearing pressure up to 0.5 MPa is allowed to reduce the weight of the reciprocating piston. The maximum side thrust will occur during the expansion stroke

How to Calculate Length of Piston Skirt given Side Thrust?

Length of Piston Skirt given Side Thrust calculator uses Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore) to calculate the Length of Piston Skirt, Length of piston skirt given side thrust is the total length of the piston skirt. Length of Piston Skirt is denoted by l_s symbol.

How to calculate Length of Piston Skirt given Side Thrust using this online calculator? To use this online calculator for Length of Piston Skirt given Side Thrust, enter Side thrust on piston (F_a), Bearing Pressure for Piston Skirt (P_b) & Diameter of Cylinder Bore (D_i) and hit the calculate button. Here is how the Length of Piston Skirt given Side Thrust calculation can be explained with given input values -> 157338.3 = 12650/(400000*0.18).

FAQ

What is Length of Piston Skirt given Side Thrust?

Length of piston skirt given side thrust is the total length of the piston skirt and is represented as l_s = F_a/(P_b*D_i) or Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore). Side thrust on piston is the perpendicular force acting onto the piston perpendicular to the piston central axis, Bearing Pressure for Piston Skirt is the compressive force acting on the contact area between two components having relative motion between them & Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.

How to calculate Length of Piston Skirt given Side Thrust?

Length of piston skirt given side thrust is the total length of the piston skirt is calculated using Length of Piston Skirt = Side thrust on piston/(Bearing Pressure for Piston Skirt*Diameter of Cylinder Bore). To calculate Length of Piston Skirt given Side Thrust, you need Side thrust on piston (F_a), Bearing Pressure for Piston Skirt (P_b) & Diameter of Cylinder Bore (D_i). With our tool, you need to enter the respective value for Side thrust on piston, Bearing Pressure for Piston Skirt & Diameter of Cylinder Bore and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Length of Piston Skirt?

In this formula, Length of Piston Skirt uses Side thrust on piston, Bearing Pressure for Piston Skirt & Diameter of Cylinder Bore. We can use 3 other way(s) to calculate the same, which is/are as follows -

Length of Piston Skirt = 0.8*Diameter of Cylinder Bore
Length of Piston Skirt = 0.65*Diameter of Cylinder Bore
Length of Piston Skirt = Coefficient of Friction for Piston Skirt*pi*Diameter of Cylinder Bore*Maximum Gas Pressure inside Cylinder/(4*Bearing Pressure for Piston Skirt)

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