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Mazda SH-VPTS specs: 2.191L (134 ci) 4-cylinder, 86 x 94.2 mm (3.3858 x 3.7087 in) bore and stroke, 14.4:1 compression. Rated 175 hp. DOHC.
The Mazda SH-VPTS is undersquare — the 3.7087" stroke exceeds the 3.3858" bore by 8.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7087" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.5 ci (549 cc).
At 14.4:1 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, sitting between the 91.5 ci and 201.4 ci members. Factory fitments include the Mazda CX-5, Mazda6, Mazda3.
| Displacement | 134 ci / 2.191 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.7087" |
| Cylinders | 4 |
| Compression ratio | 14.4:1 |
| Bore/stroke ratio | 0.913 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 175 hp |
| Bore/stroke character | 0.913 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,709 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.5 ci |
| Static compression | 14.4:1 — high enough that pump premium or better is normally required |
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