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Harley-Davidson 45 Engine Displacement
1. |
Find your bore size in Column 1. |
2. |
Move right to Column 2 to the exact size for boring (decimal) |
3. |
Select your stroke in Columns 3 through 7 |
Bore,
|
Bore,
|
3-13/16"†
|
4-7/16"††
|
4-9/16"‡
|
4-5/8"‡‡
|
4-13/16"‡‡
|
Std. |
2.745" |
45.12" |
52.52" |
54.00" |
54.74" |
56.96" |
+.010 |
2.755 |
45.45 |
52.91 |
54.4 |
55.14 |
57.38 |
.020 |
2.765 |
45.78 |
53.29 |
54.79 |
55.54 |
57.79 |
.030 |
2.775 |
46.12 |
53.68 |
55.19 |
55.94 |
58.21 |
.040 |
2.785 |
46.45 |
54.06 |
55.59 |
56.35 |
58.63 |
.050 |
2.795 |
46.78 |
54.45 |
55.99 |
56.75 |
59.05 |
.060 |
2.805 |
47.12 |
54.84 |
56.39 |
57.16 |
59.48 |
.070 |
2.815 |
47.46 |
55.24 |
56.79 |
57.57 |
59.90 |
.080 |
2.825 |
47.79 |
55.63 |
57.20 |
57.98 |
60.63 |
.090 |
2.835 |
48.13 |
56.02 |
57.60 |
58.39 |
60.76 |
.100 |
2.845** |
48.47 |
56.42 |
58.01 |
58.80 |
61.19 |
.130 |
2.875+ |
49.50 |
57.61 |
59.24 |
60.05 |
62.48 |
.140 |
2.885 |
49.84 |
58.02 |
59.65 |
60.47 |
62.92 |
.150 |
2.895++ |
50.19 |
58.42 |
60.06 |
60.89 |
63.36 |
* |
All 1929-73 D, R, W, G, K & KH 45 & 54" motors are the same bore size |
** |
Largest commercially-available 45 piston oversize |
+ |
Norton 750cc Atlas or Indian Scout 45 piston, pin must be adapted to fit, will have temperature problems in std. cylinders; not safe for 120-39/391 (WR) casting |
++ |
Absolute upper bore limit of all 45 type cylinders, not recommended |
† |
Std. stroke, all 1929-2000 D, R, W, G, K & XL flywheels
|
†† |
Indian Chief 74" flywheels |
‡ |
1954-56 KH flywheels |
‡‡ |
Available from KNS Cycle, must use Sportster rods & special 1¼" crank-pin |
For metric piston sizes, 70mm = +.010, 71mm = +.050, 72mm = +.090" |
"Harley-Davidson" name for reference purposes only. Not affiliated with Harley-Davidson Motor Co. | ||||||
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