Question
Calculate the indicated horsepower of the following engine:
5 cylinders,
a stroke length of 0.77 feet,
a bore of 3.8 inches,
operating at 3090 rpm ,
and has an indicated mean effective pressure (IMEP) of 960 psi per cylinder.
5 cylinders,
a stroke length of 0.77 feet,
a bore of 3.8 inches,
operating at 3090 rpm ,
and has an indicated mean effective pressure (IMEP) of 960 psi per cylinder.
Ask by Bob Johnston. in Canada
Dec 09,2024
Upstudy AI Solution
Tutor-Verified Answer
Answer
The indicated horsepower of the engine is approximately 1.61 horsepower.
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Beyond the Answer
To calculate the indicated horsepower (IHP) of the engine, we can use the formula:
where:
- IMEP = indicated mean effective pressure (psi),
-
= displacement volume (cubic feet), - n = engine speed (rpm).
First, we need to calculate the displacement volume for one cylinder using the formula:
Given:
- Bore = 3.8 inches = 3.8/12 feet = 0.3167 feet,
- Stroke = 0.77 feet.
Plugging in the values:
Now for 5 cylinders:
Now putting all values into the indicated horsepower formula:
- IMEP = 960 psi,
- n = 3090 rpm.
Finally:
So, the indicated horsepower of the engine is approximately 88.46 HP.