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Mazda KL-ZE specs: 2.497L (152.4 ci) 6-cylinder, 84.5 x 74.2 mm (3.3268 x 2.9213 in) bore and stroke, 10:1 compression. Rated 164-200 hp. DOHC.
The Mazda KL-ZE is oversquare — the 3.3268" bore exceeds the 2.9213" stroke by 13.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.9213" stroke does not reach 4,000 ft/min of mean piston speed until about 8,200 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 3 engines in the K-Series family, the largest at 152.4 ci. 4 factory variants share these dimensions, rated from 164 to 200 hp. Factory fitments include the Mazda MX-6, Mazda 626, Ford Probe GT and 12 others.
| Displacement | 152.4 ci / 2.497 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 2.9213" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.139 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 164–200 hp |
| Bore/stroke character | 1.139 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,921 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 |
|---|---|---|
| — | 164 hp | KL-ZE |
| — | 190 hp | KL-ZE |
| — | 199 hp | KL-ZE |
| — | 200 hp | KL-ZE, KL-ZE/DE, KL-DE/ZE, KL-DE |