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Suzuki G13A specs: 1.3L (79 ci) 4-cylinder, 74 x 77 mm (2.9134 x 3.0315 in) bore and stroke, 8.9:1 compression. Rated 63 hp, 1986–1989.
The Suzuki G13A is close to square: 2.9134" bore against 3.0315" stroke, within 3.9%, which splits the difference between a high-revving layout and a torque layout. The 3.0315" stroke does not reach 4,000 ft/min of mean piston speed until about 7,900 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).
8.9:1 is low by modern standards and generally happy on regular pump fuel.
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. 4 factory variants share these dimensions, rated at 63 hp across 1986–1989.
| Displacement | 79 ci / 1.3 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.0315" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.9:1 * |
| Bore/stroke ratio | 0.961 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 63 hp |
| Years | 1986–1989 |
| Bore/stroke character | 0.961 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,032 ft/min — conservative for a street engine |
| Displacement per cylinder | 19.8 ci |
| Static compression | 8.9:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1986 | 63 hp | G13A |
| 1987 | 63 hp | G13A |
| 1988 | 63 hp | G13A |
| 1989 | 63 hp | G13A |
1 factory vehicle, 1986–1989. Each year opens that model's engine table.