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Mechanical Efficiency of IC engine Formula

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Mechanical Efficiency (in %) is the ratio of the power delivered by a mechanical system to the power supplied to it. Check FAQs

η m = (\frac{BP}{IP}) \cdot 100

η_m - Mechanical Efficiency?BP - Brake Power?IP - Indicated Power?

Mechanical Efficiency of IC engine Example

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Here is how the Mechanical Efficiency of IC engine equation looks like with Values.

Here is how the Mechanical Efficiency of IC engine equation looks like with Units.

Here is how the Mechanical Efficiency of IC engine equation looks like.

61.1111 = (\frac{0.55}{0.9}) \cdot 100

61.1111 = (\frac{0.55kW}{0.9kW}) \cdot 100

61.1111 = (\frac{0.55}{0.9}) \cdot 100

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Mechanical Efficiency of IC engine Solution

Follow our step by step solution on how to calculate Mechanical Efficiency of IC engine?

FIRST Step Consider the formula

η m = (\frac{BP}{IP}) \cdot 100

Next Step Substitute values of Variables

∴

η m = (\frac{0.55kW}{0.9kW}) \cdot 100

Next Step Convert Units

∴

η m = (\frac{550W}{900W}) \cdot 100

Next Step Prepare to Evaluate

∴

η m = (\frac{550}{900}) \cdot 100

Next Step Evaluate

∴

η m = 61.1111111111111

LAST Step Rounding Answer

∴

η m = 61.1111

Mechanical Efficiency of IC engine Formula Elements

Variables

Mechanical Efficiency

Mechanical Efficiency (in %) is the ratio of the power delivered by a mechanical system to the power supplied to it.

Symbol: η_m

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 100.

Formulas to find Mechanical Efficiency

Brake Power

Brake Power is the power available at the crankshaft.

Symbol: BP

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Brake Power

Indicated Power

Indicated Power is the total power produced due to combustion of fuel within the IC engine's cylinder in one complete cycle neglecting any losses.

Symbol: IP

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Indicated Power

Other formulas in Important Formulas of Engine Dynamics category

Go Brake Power given Mean Effective Pressure

BP = (P mb \cdot L \cdot A \cdot (N))

Go Brake Power given Mechanical Efficiency

BP = (\frac{η m}{100}) \cdot IP

Go Indicated Power given Mechanical Efficiency

IP = \frac{BP}{\frac{η m}{100}}

Go Indicated Thermal Efficiency given Indicated Power

IDE = (\frac{IP}{m f \cdot CV}) \cdot 100

How to Evaluate Mechanical Efficiency of IC engine?

Mechanical Efficiency of IC engine evaluator uses Mechanical Efficiency = (Brake Power/Indicated Power)*100 to evaluate the Mechanical Efficiency, The Mechanical Efficiency of IC Engine formula is defined as the ratio of brake power to the indicated power of an IC engine. Mechanical Efficiency is denoted by η_m symbol.

How to evaluate Mechanical Efficiency of IC engine using this online evaluator? To use this online evaluator for Mechanical Efficiency of IC engine, enter Brake Power (BP) & Indicated Power (IP) and hit the calculate button.

FAQs on Mechanical Efficiency of IC engine

What is the formula to find Mechanical Efficiency of IC engine?

The formula of Mechanical Efficiency of IC engine is expressed as Mechanical Efficiency = (Brake Power/Indicated Power)*100. Here is an example- 550 = (550/900)*100.

How to calculate Mechanical Efficiency of IC engine?

With Brake Power (BP) & Indicated Power (IP) we can find Mechanical Efficiency of IC engine using the formula - Mechanical Efficiency = (Brake Power/Indicated Power)*100.

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