Estimated power of a motor needed for a ford focus

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Discussion Overview

The discussion centers around estimating the power of a starter motor needed for a Ford Focus with a specified engine size of 1798cc and 4 cylinders. Participants explore the necessary information and calculations required for this estimation, including torque and other engine specifications.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants seek clarification on whether the inquiry is about the power output of the engine itself or the power required for the starter motor.
  • One participant emphasizes the need for additional specifications, such as the diameter of the flywheel and the engine's compression ratio, to estimate the starter motor's power accurately.
  • Another participant points out that the torque values provided for different cylinder configurations lack context and may not be directly applicable to the starter motor calculation.
  • There is a suggestion that the original question was poorly posed, indicating a misunderstanding of the assignment's requirements.
  • Participants express the importance of adhering to forum rules regarding homework questions and suggest that the poster should attempt to solve the problem independently before seeking help.

Areas of Agreement / Disagreement

Participants generally agree that more information is needed to accurately estimate the power of the starter motor. However, there is disagreement regarding the relevance and interpretation of the provided torque values, as well as the clarity of the original question.

Contextual Notes

Limitations include the lack of specific details about the starter motor's design and the assumptions made regarding engine performance and torque calculations. The discussion does not resolve these uncertainties.

Who May Find This Useful

Individuals interested in automotive engineering, students working on related homework assignments, and those seeking to understand the relationship between engine specifications and starter motor requirements.

education1983
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How do I calculate the estimated power of a motor needed for a ford focus, engine size:1788cc, 4 cylinders??
 
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You need to provide some more information. Are you asking how much power a typical Ford 1.8L engine can produce? Or how much a 1.8L engine could theoretically produce? Or how much it actually produces? What information have you been given when you were asked this question?
 


I was told to choose a car, a petrol car, and using the engine size of the car(1798cc), work out the power of the starter motor the car would require. The cars specs are:

1798cc, 4 cylinders.
 


info given were:
2 cylinders= 125N.m
4 '' =80N.m
6 '' = 65N.m
 


education1983 said:
How do I calculate the estimated power of a motor needed for a ford focus, engine size:1788cc, 4 cylinders??

education1983 said:
I was told to choose a car, a petrol car, and using the engine size of the car(1798cc), work out the power of the starter motor the car would require. The cars specs are:

1798cc, 4 cylinders.

Your question was obviously poorly posed from the start since you mentioned nothing about the fact that you are sizing the starter motor and not the engine itself. It seems that this is a homework assignment and so we will have to ask you first, what have you done to try and solve the problem thus far?

By the way, the displacement of the engine alone is not enough to determine the required torque of the starter motor. You will probably need to know things like the diameter of the flywheel (pitch diameter), diameter of the starter's pinion gear (pitch diameter), the engine's compression ratio, and probably the engine's bore and stroke. This may give you a very rough estimate, assuming you're ignoring friction in the cylinder.
 


A good response from Mech Engineer.

Also, I'm sure you won't just have been told that "2 cylinders = 125Nm"; this itself is meaningless.

If indeed this is a homework question, I suggest you read the rules for posting such questions and then have a go at following them. Then you'll get all the help you could possibly need.
 


A vehicle's engine rotates at 5640 rpm and produces 62 hp. If the final drive ratio is 4.00 and the transmission gear ratio is 3.00, calculate the vehicle speed, in mph. The tire radius is 10.1 inches. Vehicle is at constant speed.
 


ashishbhagwat said:
A vehicle's engine rotates at 5640 rpm and produces 62 hp. If the final drive ratio is 4.00 and the transmission gear ratio is 3.00, calculate the vehicle speed, in mph. The tire radius is 10.1 inches. Vehicle is at constant speed.

Why don't you have a read of the rules we have here about homework questions? Remember, the ones you agreed to when signing up?
 

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