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Suzuki G13BA specs: 1.3L (79 ci) 4-cylinder, 74 x 75.5 mm (2.9134 x 2.9724 in) bore and stroke, 9.5:1 compression. Rated 66 hp, 1989–1995.
The Suzuki G13BA is close to square: 2.9134" bore against 2.9724" stroke, within 2.0%, which splits the difference between a high-revving layout and a torque layout. The 2.9724" stroke does not reach 4,000 ft/min of mean piston speed until about 8,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 19.8 ci (324 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 3 engines in the Suzuki 79ci family, all of them 79 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated at 66 hp across 1989–1995.
| Displacement | 79 ci / 1.3 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 2.9724" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.98 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 66 hp |
| Years | 1989–1995 |
| Bore/stroke character | 0.980 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 2,972 ft/min — conservative for a street engine |
| Displacement per cylinder | 19.8 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1989 | — | G13BA |
| 1992 | 66 hp | G13BA |
| 1993 | 66 hp | G13BA |
| 1994 | 66 hp | G13BA |
| 1995 | 66 hp | G13BA |
2 factory vehicles, 1989–1995. Each year opens that model's engine table.