Steam Engine Size and Horse Power
Make Size, B x S HP Cubic Inch HP/Cu. In.
1915 20th Century 6 1/16 x 10 16 288.7 0.055
7 x 10 20 384.8 0.052
7 ½ x 10 25 441.8 0.057
1907- 11 Advance 7 1/4 x 10 10 412.8 0.024
7 5/8 x 10 12 456.6 0.026
6 ¼ & 9 x 9 14 (T. C.) 276.1 & 572.6 0.025
8 1/2 x 10 16 567.5 0.028
7 ¼ & 10 ¼ x 9 18 (T. C.) 371.5 & 742.6 0.024
9 x 10 20 636.2 0.031
7 5/8 & 10 ¼ x 10 21 (T. C.) 456.6 & 825.2 0.023
9 x 11 22 699.8 0.031
9 & 12 x 10 26 (T. C.) 636.2 & 1131 0.020
10 x 12 30 942.5 0.032
9 & 13 x 12 35 (T. C.) 763.4 & 1592.8 0.023
9 & 12 x 11 30 (T. C.) 699.8 & 1244.1 0.021
9 & 13 x 13 40 (T. C.) 827.1 & 1725.5 0.024
1914-21 Adv-Rum 8 1/2 x 10 16 567.5 0.028
9 x 10 20 636.2 0.031
9 x 11 22 699.8 0.031
10 x 12 25 942.5 0.027
1913, 14 Avery 6 x 10 (2) 20 565.5 0.035
7 x 10 (2) 30 769.7 0.039
7 x 10 (2) 40 769.7 (200#) 0.052
10 x10 25-75 785.4 0.032
Make Size, B x S HP Cubic Inch HP/Cu. In.
1916 Avery 8 ¼ x 10 16 (175#) 534.6 0.030
8 ¾ x 10 20 (175#) 601.3 0.033
10 x 10 25 (175#) 785.4 0.032
1912 Baker 8 ¾ x 10 ¼ 16 (140#) 616.4 0.026
9 ¼ x 10 18 (140#) 817.3 0.022
10 x 10 20 (140#) 785.4 0.025
10 ¾ x 10 ½ 25 (140#) 953 0.026
1921 Baker 5 ½ & 9 ¼ x 8 20 (T. C., 300#) 190.1 & 537.6 0.053
1887 Buffalo-Pitts 5 ½ x 9 6 213.8 0.028
6 ½ x 9 8 298.7 0.027
7 ½ x 10 10 441.8 0.023
8 ¼ x 10 13 534.6 0.024
9 x 10 18 636.2 0.028
1912 Buffalo-Pitts 7 x 10 10 384.9 0.026
6 x 10 (2) 14 565.5 0.025
8 1/2 x 10 15 567.5 0.026
6 1/4 x 10 (2) 18 613.6 0.029
8 1/2 x 12 18 680.9 0.026
9 ¼ x 12 20 806.4 0.025
10 x 12 25 942.5 0.027
7 x 10 (2) 25 769.7 0.032
11 ¼ x 12 30 1192.8 0.025
7 ¾ x 12 (2) 35 1132.2 0.031
1906 Case 14 x 14 40-150 (160#) 2155.1 0.0696
Make Size, B x S HP Cubic Inch HP/Cu. In.
1913 Case 6 x 8 18 (140#) 226.2 0.080
7 ¼ x 10 30 (140#) 412.8 0.073
8 1/4 x 10 40 (140#) 534.6 0.075
9 x 10 50 (150#) 636.2 0.079
10 x 10 60 (140#) 785.4 0.076
11 x 11 80 (150#) 1045.4 0.077
12 x 12 110 (160#) 1357.2 0.081
1919 Case 7 ¼ x 10 15 412.8 0.036
8 ¼ x 10 20 534.6 0.037
9 x 10 25 636.2 0.039
10 x 10 30 785.4 0.038
10 x 11 33 863.9 0.038
11 x 11 40 1045.4 0.038
12 x 12 55 (160#) 1357.2 0.040
1908 Colean 6 x 10 (2) 18 565.5 0.032
7 x 10 (2) 25 769.6 0.032
7 1/2 x 10 (2) 30 883.6 0.034
5 x 8 (Sta.) 6 157.0 0.038
6 x9 (Sta.) 8 254.5 0.031
7 x 10 (Sta.) 11 384.9 0.029
7 ½ x 9 12 397.6 0.030
8 x 10 15 502.7 0.030
8 1/2 x 10 17 567.5 0.030
9 x 12 20 763.4 0.026
Make Size, B x S HP Cubic Inch HP/Cu. In.
1896 Frick 10 x 12 25 942.5 0.027
10 x 16 30 1256.4 0.024
11 x 16 40 1520.5 0.026
1912 Frick 4 ½ x 7 (Sta.) 4 111.3 0.036
5 x 8 (Sta.) 6 157.0
6 x9 (Sta.) 8 254.5
7 x 9 9 346.4
7 x 10 (Sta.) 10 384.9
7 ½ x 9 10 397.6
8 x 10 (Sta.) 15 502.7
8 ½ x 10 16 (135#) 567.5 0.028
9 x 10 18 (135#) 636.2
9 ½ x 10 20 (135#) 708.8
7 x 10 (2) 30 (135#) 769.7
8 x 10 (2) 35 (160#) 1005.3
9 x 12 (Sta.) 22 763.4
10 x 12 (Sta.) 25 942.5
10 x 16 (Sta.) 35 1256.6
11 x 16 (Sta.) 40 1520.5 0.026
1909 Gaar-Scott 5 ½ x 10 6 323.9 0.019
6 ½ x 11 8 365 0.022
7 x 11 10 423.3 0.024
7 ¾ x 11 13 518.9 0.025
8 ¼ x 11 16 588 0.027
8 ½ x 11 18 624.2 0.029
Make Size, B x S HP Cubic Inch HP/Cu. In.
1909 Gaar-Scott 9 ¼ x 11 22 739.2 0.030
(cont.)
6 ¾ x 11 (2) 22 787.3 0.028
7 x 11 (2) 25 846.7 0.030
8 ½ & 13 x 11 30 (T. C.) 624.2 & 1460 0.024
11 x 12 32 1140.4 0.028
6 ½ & 10 x 11 (2) 40 (T. C.) 365 & 863.9 0.027
1910 Geiser 7 x 9 10 346.4 0.029
7 1/2 x 10 14 441.8 0.032
8 x 10 15 502.7 0.030
8 1/2 x 10 16 567.5 0.028
8 3/4 x 10 18 601.3 0.030
9 1/2 x 10 22 708.8 0.031
10 x 10 25 785.4 0.032
8 1/2 x 10 (2) 35 1134.9 0.031
1913 Geiser 7 ¾ x 10 14 471.7 0.030
8 ¾ x 10 20 601.3 0.033
6 ½ x 10 (2) 20 663.7 0.030
9 ½ x 10 22 708.8 0.031
7 x 10 (2) 22 769.7 0.029
10 x 10 25 785.4 0.032
1911 Huber 7 x 8 8 307.9 0.026
7 ½ x 8 10 353.4 0.028
8 x 8 12 402.1 0.030
8 ½ x 10 16 567.5 0.028
9 x 11 18 699.8 0.026
9 ½ x 11 20 779.7 0.032
Make Size, B x S HP Cubic Inch HP/Cu. In.
1911 Huber (cont.) 10 x 12 25 942.5 0.027
11 x 12 30 1140.4 0.026
1923 Jumbo 7 7/8 x 11 15 535.8 0.028
(Harrison Machine
Works) 8 1/4 x 11 17 588 0.029
8 3/4 x 11 1/4 20 676.5 0.030
1914 Minneapolis 8 1/2 x 10 16 567.5 0.028
8 1/2 x 11 18 624.2 0.029
9 1/4 x 11 20 739.2 0.027
9 1/2 x 11 22 779.7 0.028
10 x 11 25 863.9 0.029
11 x 11 30 1045.4 0.029
12 x 12 35 1357.2 0.026
8 1/4 & 12 x 11 30 (T. C.) 588 & 1244.1 0.026
1926 Minneapolis 9 ¼ x 11 20 739.2 0.027
10 x 11 24 863.9 0.028
1894 N-S 6 x 9 6 254.5 0.024
7 x 10 10 384.8 0.026
7 1/2 x 10 13 441.8 0.029
7 3/4 x 10 15 471.7 0.032
8 x 12 16 603.2 0.027
8 ½ x 11 18 624.2 0.029
1902 N-S 7 ¼ x 10 10 412.83 0.024
7 3/4 x 10 13 471.7 0.028
8 x 12 16 603.2 0.027
8 ¼ x 12 18 641.5 0.028
8 ½ x 12 20 680.9 0.029
Make Size, B x S HP Cubic Inch HP/Cu. In.
1902 N-S (cont.) 9 1/4 x 12 25 806.4 0.031
9 3/4 x 12 30 895.9 0.033
1908 N-S 7 7/8 x 11 (2) 35-120 1071.6 0.033
1910 N-S 7 7/8 x 11 (2) 35-120 1071.6 0.033
8 x 12 16 603.2 0.027
8 1/2 x 12 20 680.9 0.029
9 1/4 x 12 25 806.4 0.031
9 3/4 x 12 30 895.9 0.033
5 3/4 x 10 (2) 16 519.3 0.031
6 3/8 x 10 (2) 20 638.4 0.031
6 3/4 x 10 (2) 25 715.7 0.035
7 1/4 x 11 (2) 30 908.2 0.033
1914 N-S 7 3/4 x 10 13-39 471.7 0.028
8 x 12 16-48 603.2 0.027
8 1/2 x 12 20-60 680.9 0.029
9 1/4 x 12 25-75 806.4 0.031
9 3/4 x 12 30-90 895.9 0.033
5 3/4 x 10 (2) 16-48 519.3 0.031
6 3/8 x 10 (2) 20-60 638.4 0.031
6 3/4 x 10 (2) 25-75 715.7 0.035
7 1/4 x 11 (2) 30-90 908.2 0.033
1915 N-S 7 ¾ x 10 13-40 471.7 0.028
8 x 12 16-50 603.2 0.027
8 1/2 x 12 20-70 680.9 0.029
Make Size, B x S HP Cubic Inch HP/Cu. In.
1915 N-S (cont.) 9 1/4 x 12 25-85 806.4 0.031
9 3/4 x 12 30-98 895.9 0.033
5 3/4 x 10 (2) 16-50 519.3 0.031
6 3/8 x 10 (2) 20-70 638.4 0.031
6 3/4 X 10 (2) 25-85 715.7 0.035
7 7/8 x 11 (2) 30-98 (132 HP) 1071.6 (2887 Ft Lbs) 0.028 (0.123)
(Wade’s engine-same as 35-120) Recorded at Rock River Thresheree, September 5, 2005
1917, 18 N-S 7 3/4 x 12 13-40 566.1 0.023
8 x 12 16-50 603.2 0.027
8 1/2 x 12 20-70 680.9 0.029
9 1/4 x 12 25-85 806.4 0.031
9 3/4 x 12 30-98 895.9 0.033
6 1/4 x 12 (2) 16-60 736.3 0.022
6 3/8 x 10 (2) 20-75 638.4 0.031
7 X 10 (2) 25-85 769.6 0.032
1920 N-S 8 x 12 16-50 603.2 0.027
8 1/2 x 12 20-70 680.9 0.029
9 1/4 x 12 25-85 806.4 0.031
6 1/4 x 10 (2) 16-60 613.6 0.026
7 x 10 (2) 25-90 769.6 0.032
8 1/2 x 12 20-70 680.9 0.029
9 1/4 x 12 25-85 806.4 0.031
6 1/4 x 10 (2) 16-60 613.6 0.026
6 5/8 x 10 (2) 20-75 689.4 0.029
7 x 10 (2) 25-90 769.6 0.032
Make Size, B x S HP Cubic Inch HP/Cu. In.
1903 Northwest 8 ½ x 10 16 (120#) 567.5 0.028
9 x 10 18 (120#) 636.2 0.028
9 ½ x 10 20 (120#) 708.8 0.028
9 ½ x 10 25 (150#) 708.8 0.035
7 ¾, & 10 ¾ x 10 20 (T.C., 120#) 471.7 & 1076.5 0.021
7 ¾ & 11 ¼ X 10 22 (T.C., 120#) 471.7 & 1268.9 0.024
8 ¼ & 12 x 10 25 (T.C., 120#) 534.6 & 1131 0.023
8 ¼ & 12 x 10 30 (T.C., 150#) 534.6 & 1131 0.028
1917 Port Huron 8 ½ X 10 20-60 (175#) 567.5 0.035
6 & 9 x 10 16-50 (T. C., 175#)) 282.7 & 636.2 0.028
6 1/2 & 9 3/4 x 10 19-65 (T. C., 175#) 331.8 & 746.6 0.029
7 1/2 & 11 x 10 24-75 (T. C., 175#) 441.8 & 950.3 0.027
8 1/2 & 13 1/4 x 10 32-100 (T. C., 175#) 567.5 & 1378.9 0.028
1905 Reeves 6 3/8 x 8 (2) 13 510.7 0.025
6 1/8 x 11 (2) 16 648.2 0.025
6 1/2 x 12 (2) 20 796.4 0.025
7 x 13 (2) 25 1000.6 0.025
7 5/8 x 14 (2) 32 1278.6 0.025
6 3/8 & 9 5/8 x 10 13 (C. C.) 319.2 & 727.6 0.020
6 3/4 & 11 x 11 16 (C. C.) 393.6 & 1045.4 0.020
7 1/4 & 12 x 12 20 (C. C.) 495.4 & 1357.2 0.020
7 3/4 & 13 x 13 25 (C. C.) 613.3 & 1725.5 0.020
8 1/2 & 14 & 14 32 (C. C.) 794.4 & 2155.1 0.020
1913 Reeves 9 & 14 ¾ x 15 40 (C. C.) 954.3 & 2563.1 0.021
Make Size, B x S HP Cubic Inch HP/Cu. In.
1914 Rumely 8 ¾ x 10 ¼ 16 616.3 0.026
10 x 10 ¼ 20 805.0 0.025
6 ¼ x 10 ¼ (2) 16 628.9 0.025
6 ½ x 12 (2) 20 796.4 0.025
10 3/8 x 11 25 930 0.027
1912 Russell 5 x 7 6 137.4 0.044
6 x 8 8 226.2 0.035
7 1/2 x 10 12 441.8 0.027
8 x 10 15 502.7 0.030
8 1/4 x 12 18 641.5 0.031
9 x 13 20 827 0.024
10 x 13 25 1021 0.024
1920 Russell 7 1/2 x 10 12-36 441.8 0.027
8 x 10 16-48 502.7 0.032
8 1/4 x 12 20-60 641.5 0.031
9 x 13 25-75 827 0.030
10 x 13 30-90 1021 0.029
1914 Sawyer- 7 x 10 30 384.8 0.078
Massey
8 x 10 51 (175#) 502.7 0.101
9 x 10 60 (175#) 636.2 0.094
9 x 11 68 (175#) 699.8 0.097
9 1/2 x 11 76 (175#) 779.7 0.097
7 1/2 & 11 x 10 82 (175#) (T. C.) 441.8 & 950.3 0.093
7 3/4 & 12 1/2 x 11 100 (175#) (T. C.) 518.9 & 1349.9 0.096
12 x 14 115 (172#) 1583.4 0.073
Make Size, B x S HP Cubic Inch HP/Cu. In.
1886 Westinghouse 4 ½ x 5 4 (110#) 79.5 0.050
5 ½ x 7 6 (110#) 166.3 0.036
7 x 7 10 (110#) 269.4 0.037
8 x 8 15 (110#) 402.1 0.037
The engine sizes listed are from catalogs on line @ steamcatalogs.com
Compound calculation: Divide HP by smaller cylinder cu. In. x 2 (for 2 cyl. X 4)
The actual force is the same for High and Low pressure pistons
The last six entries are included for interest only
1953 Skinner (LMC) 22.5 & 55 x 26 (x4) 3500 (470#) 37,900.3 & 243,635.8 0.046
S.S. Badger
Unaflow vertical 4 cyl. High pr. Up = 364.43 sq.in 470# steam = 171282.1 lbs pressure
Steeple Compound
Low pr Dn = 2342.65 sq.in 73.12# steam = 171282.1 lbs pressure
6.5” Rod = 33.183 s.i. (est.) Stroke = 26”
1862 U.S.S.Monitor 40 x 22 (2) 400 (40#) 55292.16 0.00723
13 1/2” trunk = 143.14 sq. in.
1911 Filer & Stowell 12 x 24 89 (100#) 2,714.3 0.033
30 x 60 895 (100#) 42,411.6 0.021
1911 Titanic 54 x 75 15,000 (215#) 171,767 0.022
Triple expanding 84 x 75 415,634
Vertical 4 cyl. 97 x 75(x2) 1,108,474
Compound
High pr. Dn = 2,290.23 sq. in 215# steam = 492,399.5 lbs pressure
High pr. Up = 2,101.53 sq. in 215# steam = 451,828.9 lbs pressure
Int. pr. Dn = 5,541.78 sq. in 78# steam = 432,259 lbs pressure
Int. pr. Up = 5,353.08 sq. in 78# steam = 417,540.2 lbs pressure
Low pr. Dn = 14,779.7 sq. in 24# steam = 354,712.8
Low pr. Up = 14,591 sq. in 24# steam = 350,184
15.5” Rod = 188.7 sq. in (est.) Stroke = 75”
Two engines = 30,000 plus one turbine @ 16,000 for a total of 46,000 horsepower
Make Size, B x S HP Cubic Inch HP/Cu. In.
Mikado 1003 28 x 30 (2) 3000 (170#) 36,945 0.081
Big Boy 23 ¾ x 32 (4) 6300 (300#) 56,706 0.111
Revised November 9, 2020
Terry Jones
