A-Series Engine Capacities
Many questions exist regarding differing bore and stroke capacities of the A series motor for our Sprites and Midgets. The following tables lists the more common bore and stroke combinations, courtesy of Steve Koen.
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A series engine bore and stroke comparisons |
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Imperial |
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Nominal engine capacity |
948cc |
948cc |
998cc |
998cc |
1098cc |
1275cc |
1275cc |
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Std stroke |
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3.00 inches |
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3.00 inches |
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3.30 inches |
3.20 inches |
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Long stroke |
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3.30 inches |
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3.30 inches |
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3.30 inches |
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Std bore |
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2.48 inches |
2.48 inches |
2.54 inches |
2.54 inches |
2.54 inches |
2.78 inches |
2.78 inches |
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Capacity |
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57.8 cubic inches |
63.5 cubic inches |
60.9 cubic inches |
67.0 cubic inches |
67.0 cubic inches |
77.7 cubic inches |
80.0 cubic inches |
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+0.010" bore |
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2.49 inches |
2.49 inches |
2.55 inches |
2.55 inches |
2.55 inches |
2.79 inches |
2.79 inches |
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Capacity |
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58.4 cubic inches |
64.2 cubic inches |
61.3 cubic inches |
67.3 cubic inches |
67.3 cubic inches |
78.3 cubic inches |
80.6 cubic inches |
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+0.020" bore |
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2.50 inches |
2.50 inches |
2.56 inches |
2.56 inches |
2.56 inches |
2.80 inches |
2.80 inches |
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Capacity |
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58.7 cubic inches |
64.5 cubic inches |
61.9 cubic inches |
68.0 cubic inches |
68.0 cubic inches |
78.6 cubic inches |
80.9 cubic inches |
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+0.030" bore |
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2.51 inches |
2.51 inches |
2.57 inches |
2.57 inches |
2.57 inches |
2.81 inches |
2.81 inches |
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Capacity |
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59.2 cubic inches |
65.0 cubic inches |
62.4 cubic inches |
68.5 cubic inches |
68.5 cubic inches |
79.1 cubic inches |
81.5 cubic inches |
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+0.040" bore |
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2.52 inches |
2.52 inches |
2.58 inches |
2.58 inches |
2.58 inches |
2.82 inches |
2.82 inches |
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Capacity |
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59.7 cubic inches |
65.6 cubic inches |
62.9 cubic inches |
69.1 cubic inches |
69.1 cubic inches |
79.7 cubic inches |
82.1 cubic inches |
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+0.060" bore |
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2.54 inches |
2.54 inches |
2.60 inches |
2.60 inches |
2.60 inches |
2.84 inches |
2.84 inches |
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Capacity |
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60.8 cubic inches |
66.8 cubic inches |
63.9 cubic inches |
70.2 cubic inches |
70.2 cubic inches |
81.1 cubic inches |
83.5 cubic inches |
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73mm bore |
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n/a |
n/a |
n/a |
n/a |
n/a |
2.87 inches |
2.87 inches |
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Capacity |
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n/a |
n/a |
n/a |
n/a |
n/a |
83.0 cubic inches |
85.5 cubic inches |
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73.5mm bore |
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n/a |
n/a |
n/a |
n/a |
n/a |
2.89 inches |
2.89 inches |
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Capacity |
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n/a |
n/a |
n/a |
n/a |
n/a |
84.2 cubic inches |
86.7 cubic inches |
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74mm bore |
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n/a |
n/a |
n/a |
n/a |
n/a |
2.91 inches |
2.91 inches |
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Capacity |
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n/a |
n/a |
n/a |
n/a |
n/a |
85.3 cubic inches |
87.9 cubic inches |
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A series engine bore and stroke comparisons |
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Metric |
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Nominal engine capacity |
948cc |
948cc |
998cc |
998cc |
1098cc |
1275cc |
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