Engine rpm Solution

STEP 0: Pre-Calculation Summary
Formula Used
Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter
Erpm = (MPH*ig*336)/D
This formula uses 4 Variables
Variables Used
Engine RPM - (Measured in Radian per Second) - Engine RPM is defined as the number of rotations of the engine crankshaft in one minute.
Speed of vehicle in mph - (Measured in Meter per Second) - Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour.
Gear Ratio of Transmission - Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.
Tire Diameter - (Measured in Meter) - Tire diameter is defined as the diameter of the tire that is propelled by the engine power.
STEP 1: Convert Input(s) to Base Unit
Speed of vehicle in mph: 60 Mile per Hour --> 26.8224 Meter per Second (Check conversion here)
Gear Ratio of Transmission: 2.55 --> No Conversion Required
Tire Diameter: 76 Centimeter --> 0.76 Meter (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Erpm = (MPH*ig*336)/D --> (26.8224*2.55*336)/0.76
Evaluating ... ...
Erpm = 30238.7267368421
STEP 3: Convert Result to Output's Unit
30238.7267368421 Radian per Second -->288758.569993113 Revolution per Minute (Check conversion here)
FINAL ANSWER
288758.569993113 288758.6 Revolution per Minute <-- Engine RPM
(Calculation completed in 00.004 seconds)

Credits

Created by Syed Adnan
Ramaiah University of Applied Sciences (RUAS), bangalore
Syed Adnan has created this Calculator and 200+ more calculators!
Verified by Anshika Arya
National Institute Of Technology (NIT), Hamirpur
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22 Fundamentals of IC Engine Calculators

Overall heat transfer coefficient of IC engine
Go Overall Heat Transfer Coefficient = 1/((1/Heat Transfer Coefficient on Gas Side)+(Thickness of Engine Wall/Thermal conductivity of material)+(1/Heat Transfer Coefficient on Coolant Side))
Fuel Jet Velocity
Go Fuel jet velocity = Coefficient of Discharge*sqrt(((2*(Fuel injection pressure-Pressure of charge inside the cylinder))/Fuel Density))
Rate of convection heat transfer between engine wall and coolant
Go Rate of Convection Heat Transfer = Convection Heat Transfer Coefficient*Surface Area of Engine Wall*(Engine Wall Surface Temperature-Temperature of Coolant)
Mass of air taken in each cylinder
Go Mass of air taken in each cylinder = (Intake air pressure*(Clearance volume+Displaced volume))/([R]*Intake air temperature)
Heat transfer across engine wall given overall heat transfer coefficient
Go Heat Transfer across Engine Wall = Overall Heat Transfer Coefficient*Surface Area of Engine Wall*(Gas side temperature-Coolant Side Temperature)
Power produced by IC engine given work done by engine
Go Power produced by IC engine = Work done per operating cycle*(Engine speed in rps/Crankshaft revolutions per power stroke)
Engine displacement given number of cylinders
Go Engine Displacement = Engine bore*Engine bore*Stroke Length*0.7854*Number of Cylinders
Rate of cooling of engine
Go Rate of Cooling = Rate of Cooling Constant*(Engine Temperature-Engine surrounding Temperature)
Time taken for engine to cool
Go Time taken to cool Engine = (Engine Temperature-Final Engine Temperature)/Rate of Cooling
Engine rpm
Go Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter
Kinetic energy stored in flywheel of IC engine
Go Kinetic energy stored in the flywheel = (Flywheel moment of inertia*(Flywheel angular velocity^2))/2
Swept Volume
Go Swept volume = (((pi/4)*Inner Diameter of Cylinder^2)*Stroke Length)
Work done per operating cycle in IC engine
Go Work done per operating cycle = Mean effective pressure in pascals*Displacement volume of piston
Brake output per displacement of piston
Go Brake output per displacement = Brake power per cylinder per stroke/Displaced volume
Engine specific volume
Go Engine specific volume = Displaced volume/Brake power per cylinder per stroke
Brake specific power
Go Brake specific power = Brake power per cylinder per stroke/Area of Piston
Equivalence ratio
Go Equivalence ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio
Brake work per cylinder per stroke
Go Brake work per cylinder per stroke = Bmep*Displaced volume
Compression Ratio given Clearance and Swept Volume
Go Compression Ratio = 1+(Swept volume/Clearance volume)
Engine Capacity
Go Engine capacity = Swept volume*Number of Cylinders
Mean piston speed
Go Mean Piston Speed = 2*Stroke Length*Engine Speed
Peak torque of engine
Go Peak Torque of Engine = Engine Displacement*1.25

Engine rpm Formula

Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter
Erpm = (MPH*ig*336)/D

What is engine rpm?

The full form of RPM stands for “revolution/rotations per minute.” It signifies the speed at which the rotation of the crank in the engine takes place — resulting in the deliverability of power to the rear wheels via a gearbox. Every rotation of the crank results in the movement of the gearbox such that it translates to the speed of the engine. The higher the RMP, the more significant is the speed of the bike, in turn, more significant is the fuel consumptions as well.

How to Calculate Engine rpm?

Engine rpm calculator uses Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter to calculate the Engine RPM, The Engine rpm formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox. Engine RPM is denoted by Erpm symbol.

How to calculate Engine rpm using this online calculator? To use this online calculator for Engine rpm, enter Speed of vehicle in mph (MPH), Gear Ratio of Transmission (ig) & Tire Diameter (D) and hit the calculate button. Here is how the Engine rpm calculation can be explained with given input values -> 2.8E+6 = (26.8224*2.55*336)/0.76.

FAQ

What is Engine rpm?
The Engine rpm formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox and is represented as Erpm = (MPH*ig*336)/D or Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter. Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour, Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox & Tire diameter is defined as the diameter of the tire that is propelled by the engine power.
How to calculate Engine rpm?
The Engine rpm formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox is calculated using Engine RPM = (Speed of vehicle in mph*Gear Ratio of Transmission*336)/Tire Diameter. To calculate Engine rpm, you need Speed of vehicle in mph (MPH), Gear Ratio of Transmission (ig) & Tire Diameter (D). With our tool, you need to enter the respective value for Speed of vehicle in mph, Gear Ratio of Transmission & Tire Diameter 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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