
#1
Oct1308, 11:29 AM

P: 11

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




#2
Oct1308, 02:25 PM

Sci Advisor
PF Gold
P: 2,793

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?




#3
Oct1308, 02:42 PM

P: 11

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. 



#4
Oct1308, 02:45 PM

P: 11

estimated power of a motor needed for a ford focus
info given were:
2 cylinders= 125N.m 4 '' =80N.m 6 '' = 65N.m 



#5
Oct1308, 03:56 PM

Sci Advisor
PF Gold
P: 2,234

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. 



#6
Oct1408, 11:39 AM

Sci Advisor
PF Gold
P: 2,793

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. 



#7
Oct1508, 02:41 AM

P: 12

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.



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