Question
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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.

Ask by Stuart Reyes. in Canada
Dec 09,2024

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Tutor-Verified Answer

Answer

The stroke length of the engine is approximately 0.04 feet.

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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:
  1. Each cylinder produces a power stroke once every two revolutions (for a four-stroke engine).
  2. 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.

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