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Infiniti KR15DDT specs: 1.5L (91.5 ci) 3-cylinder, 84 x 90.1 mm (3.3071 x 3.5472 in) bore and stroke, 8:1 compression. Rated 201 hp. DOHC.
The Infiniti KR15DDT is undersquare — the 3.5472" stroke exceeds the 3.3071" bore by 6.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5472" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 3 cylinders displaces 30.5 ci (500 cc).
8:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the KR family, the smallest at 91.5 ci. Factory fitments include the Infiniti QX50, Infiniti QX55.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5472" |
| Cylinders | 3 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 0.932 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 201 hp |
| Bore/stroke character | 0.932 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,547 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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