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Lexus 3GR-FSE specs: 3.0L (183 ci) 6-cylinder, 87.5 x 83 mm (3.4449 x 3.2677 in) bore and stroke. Rated 245 hp, 2006. Used in the Lexus GS.
The Lexus 3GR-FSE is oversquare — the 3.4449" bore exceeds the 3.2677" stroke by 5.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.2677" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 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).
It is one of 2 engines in the Lexus 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 | 3.4449" |
| Stroke | 3.2677" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.054 |
| Fuel type | gas |
|---|---|
| Advertised HP | 245 hp |
| Years | 2006 |
| Bore/stroke character | 1.054 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,268 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
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1 factory vehicle, 2006. Each year opens that model's engine table.