What is a Farnboro Engine Indicator and How is it Used?

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In summary, a Farnborough engine indicator was an early mechanical device used to measure the work done by the gas in an IC engine. It plotted pressure against volume in the cylinder over the engine cycle. However, with the availability of electronic pressure transducers, the use of Farnborough indicators has become obsolete as they are no longer necessary for measuring an indicating diagram.
  • #1
monty37
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what is a farnboro engine indicator and what is it used for?
 
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  • #2
For an IC engine, an "indicator diagram" is a plot of pressure against volume in the cylinder over the engine cycle, which measures the work done by the gas.

The Farnborough indicator was an early mechanical device to measure this, before electronic pressure transducers etc were available.

Googling for "Farnborough Indicator" will find you more details (note the correct spelling).
 
  • #3
I did find details but the principle ,experimental setup etc are not explained ,is this
indicator obsolete now ?
 
  • #4
Everyone uses pressure transducers now, these are read at high speed and correlated against crank angle electronically to give an indicating diagram.
 

FAQ: What is a Farnboro Engine Indicator and How is it Used?

What is a Farnboro engine indicator?

The Farnboro engine indicator is a device used to measure and record the pressure inside a cylinder of an internal combustion engine. It consists of a spring-loaded piston connected to a pen that traces a graph on a rotating drum, showing the pressure changes during the engine's operation.

How does a Farnboro engine indicator work?

The Farnboro engine indicator works by attaching the piston assembly to the cylinder head of the engine. As the piston moves up and down, it compresses the spring and moves the pen, creating a graph of the pressure changes. The rotating drum allows for multiple revolutions of the engine, providing a complete picture of the pressure throughout the entire cycle.

What is the purpose of using a Farnboro engine indicator?

The main purpose of using a Farnboro engine indicator is to measure the performance and efficiency of an internal combustion engine. By analyzing the pressure changes in the cylinder, engineers can identify any potential issues with the engine's operation and make necessary adjustments for improved performance.

Is the Farnboro engine indicator still used today?

While newer technologies have been developed for measuring engine performance, the Farnboro engine indicator is still used today in some applications. It is particularly useful for older or smaller engines that may not have built-in pressure sensors.

How accurate is the Farnboro engine indicator?

The accuracy of the Farnboro engine indicator depends on the skill of the operator and the condition of the device. With proper calibration and use, it can provide accurate and reliable measurements of engine performance. However, newer technologies such as digital pressure sensors may offer more precise readings.

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