| Model | Horsepower | Year(s) |
|---|---|---|
| P-50 | 20 | 1930,1931,1932 |
| P-65 | 21.4 | 1933 |
| P-70 | 21.4 | 1934 |
| P-75 | 22 | 1935 |
| P-80 | 22 | 1936 |
| PA-50 | 20 | 1930,1931,1932 |
| PE-50 | 20 | 1930,1931,1932 |
| PO-10 | 22 | 1940 |
| PO-15 | 22 | 1941,1942,1943,1944,1945,1946,1947,1948,1949,1950 |
| PO-37 | 22 | 1937 |
| PO-38 | 22 | 1938 |
| PO-39 | 22 | 1939 |
| PR-40 | 16.5 | 1928 |
| PR-50 | 24 | 1930 |
| PR-55 | 27 | 1931 |
| PR-60 | 27 | 1932 |
| PR-65 | 27 | 1933 |
| QD-10 | 10 | 1949,1950 |
| QD-11 | 10 | 1949,1950 |
| QD-12 | 10 | 1951,1952 |