Connecting rod length to crank radius ratio Solution

STEP 0: Pre-Calculation Summary
Formula Used
Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine
R = r/rc
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/rc --> 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)

Credits

Created by Syed Adnan
Ramaiah University of Applied Sciences (RUAS), bangalore
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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

Connecting rod length to crank radius ratio Formula

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

What is the advantage of having connecting rod length to crank radius ratio?

The connecting rod length to crank radius ratio is usually defined as R. For a fixed volumetric capacity of the engine, a longer stroke allows for a smaller bore (under square). The advantage is a lower surface area in the combustion chamber and correspondingly less heat loss. This will improve the thermal efficiency within the combustion chamber. The disadvantage is that the longer stroke, the higher piston speed and higher friction losses, which reduce the effective engine power.

If the stroke is reduced, the bore diameter must be increased and the engine will be over square. This results in lower friction losses but increases heat transfer losses. Most of the modern automobile engines are near square, with some slightly over square and some slightly under square.

How to Calculate Connecting rod length to crank radius ratio?

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

FAQ

What is Connecting rod length to crank radius ratio?
The Connecting rod length to crank radius ratio 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/rc 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 Connecting rod length to crank radius ratio?
The Connecting rod length to crank radius ratio 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 Connecting rod length to crank radius ratio, you need Connecting rod length (r) & Crank Radius of Engine (rc). 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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