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Mazda S5-DPTS specs: 1.5L (91.5 ci) 4-cylinder, 78 x 78.4 mm (3.0709 x 3.0866 in) bore and stroke, 14.8:1 compression. Rated 105 hp. DOHC.
The Mazda S5-DPTS is close to square: 3.0709" bore against 3.0866" stroke, within 0.5%, which splits the difference between a high-revving layout and a torque layout. The 3.0866" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.9 ci (375 cc).
At 14.8:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 7 engines in the Skyactiv-D family, the smallest at 91.5 ci. Factory fitments include the Mazda 2, Mazda 3, Mazda CX-3.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 3.0709" |
| Stroke | 3.0866" |
| Cylinders | 4 |
| Compression ratio | 14.8:1 |
| Bore/stroke ratio | 0.995 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 105 hp |
| Bore/stroke character | 0.995 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,087 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 14.8:1 — high enough that pump premium or better is normally required |
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