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Kia D1.5 CRDi specs: 1.5L (91.54 ci) 4-cylinder, 75 x 84.5 mm (2.9528 x 3.3268 in) bore and stroke, 16:1 compression. Rated 115 hp. DOHC.
The Kia D1.5 CRDi is undersquare — the 3.3268" stroke exceeds the 2.9528" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3268" stroke does not reach 4,000 ft/min of mean piston speed until about 7,200 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 16:1 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 13 engines in the Smartstream family, sitting between the 61.02 ci and 213.58 ci members. Factory fitments include the Kia Seltos (India).
| Displacement | 91.54 ci / 1.5 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 3.3268" |
| Cylinders | 4 |
| Compression ratio | 16:1 |
| Bore/stroke ratio | 0.888 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 115 hp |
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,327 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 16:1 — high enough that pump premium or better is normally required |
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