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Mitsubishi 6G72 specs: 3.0L (183 ci) 6-cylinder, 91.1 x 76 mm (3.5866 x 2.9921 in) bore and stroke, 8.9:1 compression. Built 1988.
The Mitsubishi 6G72 is oversquare — the 3.5866" bore exceeds the 2.9921" stroke by 19.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.9921" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.5 ci (500 cc).
8.9:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Mitsubishi 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 2.9921" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 8.9:1 * |
| Bore/stroke ratio | 1.199 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Firing order | 1-2-3-4-5-6 |
| Years | 1988 |
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 8.9:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1988. Each year opens that model's engine table.