BOURKE CYCLE FORMULA

TABLE I
RANGE OF BORE SIZES BASED ON STROKE

STROKE IN INCHES STROKE TO BORE RATIO @ 1 TO 1.333 STROKE TO BORE RATIO @ 1 TO 1.667
0.250 0.333” 0.417”
0.375 0.500” 0.625”
0.500 0.667” 0.833”
0.625 0.833” 1.042”
0.750 1.000” 1.250”
0.875 1.167” 1.458”
1.000 1.333” 1.667”
1.125 1.500” 1.875”
1.250 1.667” 2.083”
1.375 1.833” 2.292”
1.500 2.000” 2.500”
1.625 2.167” 2.708”
1.750 2.333” 2.917”
1.875 2.500” 3.125”
2.000 2.667” 3.333”
2.125 2.833” 3.542”
2.250 3.000” 3.750”
2.375 3.167” 3.958”
2.500 3.333” 4.167”
2.625 3.500” 4.375”
2.750 3.667” 4.583”
2.875 3.833” 4.792”
3.000 4.000” 5.000”
3.125 4.167” 5.208”
3.250 4.333” 5.417”
3.375 4.500” 5.625”
3.500 4.667” 5.833”
3.625 4.833” 6.042”
3.750 5.000” 6.250”
3.875 5.167” 6.458”
4.000 5.333” 6.667”

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