See other engines in this family
Toyota 1JZ specs: 2.5L (152.3 ci) 6-cylinder, 86 x 71.5 mm (3.3858 x 2.8150 in) bore and stroke, 10:1 compression. Rated 180-200 hp. DOHC.
The Toyota 1JZ is oversquare — the 3.3858" bore exceeds the 2.815" stroke by 20.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.815" stroke does not reach 4,000 ft/min of mean piston speed until about 8,550 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 25.4 ci (416 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 2 engines in the 1JZ family, all of them 152.3 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated from 180 to 200 hp. Factory fitments include the Toyota Chaser, Toyota Cresta, Toyota Mark II and 6 others.
| Displacement | 152.3 ci / 2.5 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 2.815" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.203 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 180–200 hp |
| Bore/stroke character | 1.203 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,815 ft/min — conservative for a street engine |
| Displacement per cylinder | 25.4 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.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 180 hp | 1JZ-GE (Gen 1) |
| — | 200 hp | 1JZ-GE (Gen 2), 1JZ-FSE |