Question
Calculate the stroke length (in feet) of an engine with the following parameters:
6 cylinders,
has an indicated mean effective pressure (IMEP) of 1510 psi per cylinder,
a bore of 3.8 inches,
operating at 1270 rpm ,
and operates at 1900 horsepower.
Round to 2 decimal places.
6 cylinders,
has an indicated mean effective pressure (IMEP) of 1510 psi per cylinder,
a bore of 3.8 inches,
operating at 1270 rpm ,
and operates at 1900 horsepower.
Round to 2 decimal places.
Ask by Stuart Reyes. in Canada
Dec 09,2024
Upstudy AI Solution
Tutor-Verified Answer
Answer
The stroke length of the engine is approximately 0.04 feet.
Solution

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The Deep Dive
To find the stroke length of the engine, we can use the formula for horsepower (
) in terms of the dimensions and performance of the engine:
where:
-
is the horsepower (1900 HP) -
is the indicated mean effective pressure (1510 psi) -
is the area of the piston (in square inches) -
is the stroke length (in inches) -
is the engine speed (number of power strokes per minute)
Since this is a 6-cylinder engine, each cylinder works in a two-stroke cycle for every crankshaft rotation, meaning effective power strokes per minute for a four-stroke engine is half the RPM.
Let’s find the area
first:
where
is the bore in inches.
Given:
- Bore
= 3.8 inches
Thus,
Effective Power Strokes
For a 6-cylinder engine at 1270 RPM:
- Each cylinder produces a power stroke once every two revolutions (for a four-stroke engine).
- Thus total effective strokes (assuming a four-stroke engine) =
Rearranging the Horsepower Formula
We need to express stroke length
:
Plugging in the numbers:
Giving,
Calculating:
To convert to feet:
So, the stroke length of the engine is approximately 0.31 feet when rounded to two decimal places.