Number of Piston Rings Calculator

✖Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.ⓘ Diameter of Cylinder Bore [D_i]			+10% -10%
✖Minimum axial thickness of piston ring is the minimum required length of a piston ring along the longitudinal length of the piston.ⓘ Minimum Axial Thickness of Piston Ring [h_min]			+10% -10%

✖Number of piston rings is the total number of piston rings used inside a cylinder block.ⓘ Number of Piston Rings [z]

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Formula

✖

Number of Piston Rings

Formula

`"z" = "D"_{"i"}/(10*"h"_{"min"})`

Example

`"4"="180mm"/(10*"4.5mm")`

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Number of Piston Rings Solution

STEP 0: Pre-Calculation Summary

Formula Used

Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring)
z = D_i/(10*h_min)
This formula uses 3 Variables

Variables Used

Number of Piston Rings - Number of piston rings is the total number of piston rings used inside a cylinder block.
Diameter of Cylinder Bore - (Measured in Meter) - Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder.
Minimum Axial Thickness of Piston Ring - (Measured in Meter) - Minimum axial thickness of piston ring is the minimum required length of a piston ring along the longitudinal length of the piston.

STEP 1: Convert Input(s) to Base Unit

Diameter of Cylinder Bore: 180 Millimeter --> 0.18 Meter (Check conversion here)
Minimum Axial Thickness of Piston Ring: 4.5 Millimeter --> 0.0045 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

z = D_i/(10*h_min) --> 0.18/(10*0.0045)

Evaluating ... ...

z = 4

STEP 3: Convert Result to Output's Unit

4 --> No Conversion Required

FINAL ANSWER

4 <-- Number of Piston Rings

(Calculation completed in 00.004 seconds)

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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!

< 11 Piston Rings Calculators

Radial Width of Piston Ring

Go Radial Width of Piston Ring = Diameter of Cylinder Bore*sqrt(3*Allowable Radial Pressure on Piston Ring/Permissible Tensile Stress for Ring)

Length of Ring Section of Piston

Go Length of Ring Section of Piston = Number of Piston Rings*Axial Thickness of Piston Ring+(Number of Piston Rings-1)*Width of Ring Groove

Number of Piston Rings

Go Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring)

Minimum Axial Thickness of Piston Ring given Cylinder Inner Diameter

Go Axial Thickness of Piston Ring = Diameter of Cylinder Bore/(10*Number of Piston Rings)

Minimum Gap between Free Ends of Ring before Assembly

Go Gap between free Ends of Piston Ring = 3.5*Radial Width of Piston Ring

Maximum Gap between Free Ends of Ring after Assembly

Go Gap between free Ends of Piston Ring = 0.004*Diameter of Cylinder Bore

Minimum Gap between Free Ends of Ring after Assembly

Go Gap between free Ends of Piston Ring = 0.002*Diameter of Cylinder Bore

Maximum Gap between Free Ends of Ring before Assembly

Go Gap between free Ends of Piston Ring = 4*Radial Width of Piston Ring

Minimum Axial Thickness of Piston Ring given Radial Width of Ring

Go Axial Thickness of Piston Ring = 0.7*Radial Width of Piston Ring

Minimum Width of Ring Groove

Go Width of Ring Groove = 0.75*Axial Thickness of Piston Ring

Maximum Width of Top Land

Go Width of Top Land = 1.2*Thickness of Piston Head

Number of Piston Rings Formula

Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring)
z = D_i/(10*h_min)

Piston rings types

In IC engines, two types of piston rings are used, viz., compression rings and oil scraper rings. The main function of compression rings is to maintain a seal between the cylinder wall and piston and prevent leakage of gas past the piston. They also transfer heat from the piston head to the cylinder wall. Piston rings also absorb fluctuations in side thrust. Oil scraper rings or oil control rings are provided below the compression rings. They provide proper lubrication of the cylinder liner and reduce frictional losses. Oil scraper rings allow a sufficient quantity of lubricating oil to move up during the upward stroke and at the same time, scrap the excess oil from the inner surface of the liner and send it back to the crankcase. This prevents the leakage of oil into the combustion chamber.

How to Calculate Number of Piston Rings?

Number of Piston Rings calculator uses Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring) to calculate the Number of Piston Rings, Number of piston rings is the total number of piston rings used with a single piston inside an engine cylinder. Number of Piston Rings is denoted by z symbol.

How to calculate Number of Piston Rings using this online calculator? To use this online calculator for Number of Piston Rings, enter Diameter of Cylinder Bore (D_i) & Minimum Axial Thickness of Piston Ring (h_min) and hit the calculate button. Here is how the Number of Piston Rings calculation can be explained with given input values -> 4.466667 = 0.18/(10*0.0045).

FAQ

What is Number of Piston Rings?

Number of piston rings is the total number of piston rings used with a single piston inside an engine cylinder and is represented as z = D_i/(10*h_min) or Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring). Diameter of Cylinder Bore is the internal surface diameter of an engine cylinder & Minimum axial thickness of piston ring is the minimum required length of a piston ring along the longitudinal length of the piston.

How to calculate Number of Piston Rings?

Number of piston rings is the total number of piston rings used with a single piston inside an engine cylinder is calculated using Number of Piston Rings = Diameter of Cylinder Bore/(10*Minimum Axial Thickness of Piston Ring). To calculate Number of Piston Rings, you need Diameter of Cylinder Bore (D_i) & Minimum Axial Thickness of Piston Ring (h_min). With our tool, you need to enter the respective value for Diameter of Cylinder Bore & Minimum Axial Thickness of Piston Ring and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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