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Mazda KL-DE (Miller Cycle) specs: 2.255L (137.6 ci) 6-cylinder, 84.5 x 67 mm (3.3268 x 2.6378 in) bore and stroke, 8:1 compression. Rated 210 hp. DOHC.
The Mazda KL-DE (Miller Cycle) is oversquare — the 3.3268" bore exceeds the 2.6378" stroke by 26.1% — a layout that favors airflow and RPM over leverage at the crank. The 2.6378" stroke does not reach 4,000 ft/min of mean piston speed until about 9,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 22.9 ci (376 cc).
8:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the K-Series family, the smallest at 137.6 ci. Factory fitments include the Mazda Millenia S.
| Displacement | 137.6 ci / 2.255 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 2.6378" |
| Cylinders | 6 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 1.261 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 210 hp |
| Bore/stroke character | 1.261 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,638 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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