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Mazda G6 specs: 2.6L (159 ci) 4-cylinder, 92 x 98 mm (3.6220 x 3.8583 in) bore and stroke, 8.4:1 compression. Rated 121 hp, 1989–1993.
The Mazda 159ci (G6) is undersquare — the 3.8583" stroke exceeds the 3.622" bore by 6.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8583" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 39.8 ci (651 cc).
8.4:1 is low by modern standards and generally happy on regular pump fuel.
5 factory variants share these dimensions, rated at 121 hp across 1989–1993.
| Displacement | 159 ci / 2.6 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.4:1 * |
| Bore/stroke ratio | 0.939 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 121 hp |
| Years | 1989–1993 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1989 | G6 net | 121 @ 4600 * | 149 lb-ft @ 3500 * | 8.4:1 * |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.939 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 39.8 ci |
| Static compression | 8.4:1 — 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 |
|---|---|---|
| 1989 | 121 hp | G6 |
| 1990 | 121 hp | G6 |
| 1991 | 121 hp | G6 |
| 1992 | 121 hp | G6 |
| 1993 | 121 hp | G6 |
1 factory vehicle, 1989–1993. Each year opens that model's engine table.