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Engine rpm Formula

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Engine RPM is defined as the number of rotations of the engine crankshaft in one minute. Check FAQs

ω e = \frac{MPH \cdot i g \cdot 336}{D}

ω_e - Engine RPM?MPH - Speed of Vehicle?i_g - Gear Ratio of Transmission?D - Tire Diameter?

Engine rpm Example

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With units

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Here is how the Engine rpm equation looks like with Values.

Here is how the Engine rpm equation looks like with Units.

Here is how the Engine rpm equation looks like.

288758.57 = \frac{60 \cdot 2.55 \cdot 336}{76}

288758.57rev/min = \frac{60mi/h \cdot 2.55 \cdot 336}{76cm}

288758.57 = \frac{60 \cdot 2.55 \cdot 336}{76}

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Engine rpm Solution

Follow our step by step solution on how to calculate Engine rpm?

FIRST Step Consider the formula

ω e = \frac{MPH \cdot i g \cdot 336}{D}

Next Step Substitute values of Variables

∴

ω e = \frac{60mi/h \cdot 2.55 \cdot 336}{76cm}

Next Step Convert Units

∴

ω e = \frac{26.8224m/s \cdot 2.55 \cdot 336}{0.76m}

Next Step Prepare to Evaluate

∴

ω e = \frac{26.8224 \cdot 2.55 \cdot 336}{0.76}

Next Step Evaluate

∴

ω e = 30238.7267368421rad/s

Next Step Convert to Output's Unit

∴

ω e = 288758.569993113rev/min

LAST Step Rounding Answer

∴

ω e = 288758.57rev/min

Engine rpm Formula Elements

Variables

Engine RPM

Engine RPM is defined as the number of rotations of the engine crankshaft in one minute.

Symbol: ω_e

Measurement: Angular VelocityUnit: rev/min

Note: Value should be greater than 0.

Formulas to find Engine RPM

Speed of Vehicle

Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour.

Symbol: MPH

Measurement: SpeedUnit: mi/h

Note: Value should be greater than 0.

Formulas to find Speed of Vehicle

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.

Symbol: i_g

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Gear Ratio of Transmission

Tire Diameter

Tire Diameter is defined as the diameter of the tire that is propelled by the engine power.

Symbol: D

Measurement: LengthUnit: cm

Note: Value should be greater than 0.

Formulas to find Tire Diameter

Other formulas in Important Formulas of Engine Dynamics category

Go Beale Number

B n = \frac{HP}{P \cdot SV p \cdot f e}

Go Friction Power

FP = IP - BP

Go Swept Volume

V s = (((\frac{π}{4}) \cdot {D ic}^{2}) \cdot L)

Go Mean piston speed

s p = 2 \cdot L \cdot N

How to Evaluate Engine rpm?

Engine rpm evaluator uses Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter to evaluate 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 ω_e symbol.

How to evaluate Engine rpm using this online evaluator? To use this online evaluator for Engine rpm, enter Speed of Vehicle (MPH), Gear Ratio of Transmission (i_g) & Tire Diameter (D) and hit the calculate button.

FAQs on Engine rpm

What is the formula to find Engine rpm?

The formula of Engine rpm is expressed as Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter. Here is an example- 2.8E+6 = (26.8224*2.55*336)/0.76.

How to calculate Engine rpm?

With Speed of Vehicle (MPH), Gear Ratio of Transmission (i_g) & Tire Diameter (D) we can find Engine rpm using the formula - Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter.

Can the Engine rpm be negative?

No, the Engine rpm, measured in Angular Velocity cannot be negative.

Which unit is used to measure Engine rpm?

Engine rpm is usually measured using the Revolution per Minute[rev/min] for Angular Velocity. Radian per Second[rev/min], Radian per Day[rev/min], Radian per Hour[rev/min] are the few other units in which Engine rpm can be measured.

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Engine rpm Formula

Engine rpm Example

Engine rpm Solution

Engine rpm Formula Elements

Other formulas in Important Formulas of Engine Dynamics category

How to Evaluate Engine rpm?

FAQs on Engine rpm

Variable Name