See other engines in this family
Toyota 1GR-FE specs: 4.0L (241.4 ci) 6-cylinder, 94 x 95 mm (3.7008 x 3.7402 in) bore and stroke, 10:1 compression. Rated 236 hp. Rod ratio and piston speed.
The Toyota 1GR-FE is close to square: 3.7008" bore against 3.7402" stroke, within 1.1%, which splits the difference between a high-revving layout and a torque layout. The 3.7402" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 40.2 ci (659 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 11 engines in the GR V6 family, the largest at 241.4 ci. Factory fitments include the Toyota Tacoma, Toyota 4Runner, Toyota FJ Cruiser and 3 others.
| Displacement | 241.4 ci / 4 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.7402" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.989 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 236 hp |
| Bore/stroke character | 0.989 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,740 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.2 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.