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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