Ratio of cylinder bore to piston stroke Calculator

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Engine Performance Parameters

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For 4 Stroke Engine

For 2 Stroke Engine

✖Connecting rod length is defined as the total length of the connecting rod of an iC engine.ⓘ Connecting rod length [r]			+10% -10%
✖Crank Radius of Engine is the length of the crank of an engine. It is the distance between crank center and crank pin, i.e. half stroke.ⓘ Crank Radius of Engine [r_c]			+10% -10%

✖Connecting rod length to crank radius ratio is defined as the ratio of connecting rod length to the crankshaft radius of an IC engine.ⓘ Ratio of cylinder bore to piston stroke [R]

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Formula

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Ratio of cylinder bore to piston stroke

Formula

`"R" = "r"/"r"_{"c"}`

Example

`"1.090909"="150mm"/"137.5mm"`

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Ratio of cylinder bore to piston stroke Solution

STEP 0: Pre-Calculation Summary

Formula Used

Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine
R = r/r_c
This formula uses 3 Variables

Variables Used

Connecting rod length to crank radius ratio - Connecting rod length to crank radius ratio is defined as the ratio of connecting rod length to the crankshaft radius of an IC engine.
Connecting rod length - (Measured in Meter) - Connecting rod length is defined as the total length of the connecting rod of an iC engine.
Crank Radius of Engine - (Measured in Meter) - Crank Radius of Engine is the length of the crank of an engine. It is the distance between crank center and crank pin, i.e. half stroke.

STEP 1: Convert Input(s) to Base Unit

Connecting rod length: 150 Millimeter --> 0.15 Meter (Check conversion here)
Crank Radius of Engine: 137.5 Millimeter --> 0.1375 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R = r/r_c --> 0.15/0.1375

Evaluating ... ...

R = 1.09090909090909

STEP 3: Convert Result to Output's Unit

1.09090909090909 --> No Conversion Required

FINAL ANSWER

1.09090909090909 ≈ 1.090909 <-- Connecting rod length to crank radius ratio

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Engine Performance Parameters » For 4 Stroke Engine » Ratio of cylinder bore to piston stroke

Credits

Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

Syed Adnan has created this Calculator and 200+ more calculators!

Verified by Kartikay Pandit

National Institute Of Technology (NIT), Hamirpur

Kartikay Pandit has verified this Calculator and 400+ more calculators!

< 24 For 4 Stroke Engine Calculators

Volumetric efficiency of IC engine

Go Volumetric efficiency of IC engine = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/(Air density at intake*Theoretical volume of engine*Engine speed in rps)

Rate of heat conduction of engine wall

Go Rate of Heat Conduction of Engine Wall = ((-Thermal conductivity of material)*Surface Area of Engine Wall*Temperature Difference across Engine Wall)/Thickness of Engine Wall

Brake power measured with dynamo meter

Go Brake power measured with dynamo meter = (pi*Pulley diameter*(Engine speed in rps*60)*(Dead weight-Spring scale reading))/60

Indicated Power of Four-stroke Engine

Go Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)

Volumetric Efficiency for 4S engines

Go Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Air density at intake*Piston Swept Volume*(Engine Speed)))*100

Brake Mean Effective Pressure of 4S Engines given Brake power

Go Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))

Work done per cycle in ic engine

Go Work done per cycle in ic engine = (Indicated engine power*Crankshaft revolutions per power stroke)/Engine Speed in rpm

Fuel conversion efficiency

Go Fuel conversion efficiency = Work done per cycle in ic engine/(Mass of fuel added per cycle*Heating value of the fuel)

Combustion efficiency

Go Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)

Intake air mass of engine cylinder

Go Mass of air at intake = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/Engine Speed in rpm

Bmep given engine torque

Go Bmep = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed

Displaced volume in engine cylinder

Go Displaced volume = (Piston stroke*pi*(Engine cylinder bore in meter^2))/4

Intake air density

Go Air density at intake = Intake air pressure/([R]*Intake air temperature)

Thermal efficiency of IC engine

Go Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle

Volumetric efficiency of IC engine given actual volume of engine cylinder

Go Volumetric efficiency of IC engine = Actual volume of intake air/Theoretical volume of engine

Connecting rod length to crank radius ratio

Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine

Ratio of cylinder bore to piston stroke

Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine

Total cylinder volume of IC engine

Go Total volume of an engine = Total number of cylinders*Total volume of engine cylinder

Fuel conversion efficiency given thermal conversion efficiency

Go Fuel conversion efficiency = Combustion efficiency*Thermal conversion efficiency

Frictional power of engine

Go Frictional power of engine = Indicated Power of Engine-Brake power of engine

Actual intake air volume per cylinder

Go Actual volume of intake air = Mass of air at intake/Air density at intake

Horsepower of engine

Go Horsepower of engine = (Engine Torque*Engine RPM)/5252

Indicated mean effective pressure given mechanical efficiency

Go Imep = Bmep/Mechanical efficiency of ic engine

Frictional mean effective pressure

Go Fmep = Imep-Bmep

Ratio of cylinder bore to piston stroke Formula

Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine
R = r/r_c

Why is the ratio of cylinder bore to piston stroke significant?

The ratio of cylinder bore to piston stroke is most of the time defined as the Greek letter zeta ζ. For passenger road vehicles the bore to stroke ratio is usually from 0.8 to 1.2. When the bore is equal to the stroke, B = S, the engine is called square engine. If the stroke is higher than the bore the engine is under square. If the length of the stroke is less than the bore diameter the engine is called over square.

How to Calculate Ratio of cylinder bore to piston stroke?

Ratio of cylinder bore to piston stroke calculator uses Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine to calculate the Connecting rod length to crank radius ratio, The Ratio of cylinder bore to piston stroke formula is defined as the ratio of the connecting rod length to the crankshaft radius of an IC engine. Connecting rod length to crank radius ratio is denoted by R symbol.

How to calculate Ratio of cylinder bore to piston stroke using this online calculator? To use this online calculator for Ratio of cylinder bore to piston stroke, enter Connecting rod length (r) & Crank Radius of Engine (r_c) and hit the calculate button. Here is how the Ratio of cylinder bore to piston stroke calculation can be explained with given input values -> 1.090909 = 0.15/0.1375.

FAQ

What is Ratio of cylinder bore to piston stroke?

The Ratio of cylinder bore to piston stroke formula is defined as the ratio of the connecting rod length to the crankshaft radius of an IC engine and is represented as R = r/r_c or Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine. Connecting rod length is defined as the total length of the connecting rod of an iC engine & Crank Radius of Engine is the length of the crank of an engine. It is the distance between crank center and crank pin, i.e. half stroke.

How to calculate Ratio of cylinder bore to piston stroke?

The Ratio of cylinder bore to piston stroke formula is defined as the ratio of the connecting rod length to the crankshaft radius of an IC engine is calculated using Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine. To calculate Ratio of cylinder bore to piston stroke, you need Connecting rod length (r) & Crank Radius of Engine (r_c). With our tool, you need to enter the respective value for Connecting rod length & Crank Radius of Engine 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 Connecting rod length to crank radius ratio?

In this formula, Connecting rod length to crank radius ratio uses Connecting rod length & Crank Radius of Engine. We can use 1 other way(s) to calculate the same, which is/are as follows -

Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine

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