Leonard Joseph Zengel
Birthplace: Dayton, Ohio
Born: March 15, 1887
Died: September 24, 1963
Len Zengel
Leonard Joseph Zengel
Birthplace: Dayton, Ohio
Born: March 15, 1887
Died: September 24, 1963
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| Track | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Elgin | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | |
| Indianapolis | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Philadelphia | 2 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | |
| Santa Monica | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Chassis | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Chadwick | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| Marmon | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| National | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | |
| Stutz | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Engine | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Chadwick | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| Marmon | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| National | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | |
| Wisconsin | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |