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Hyundai D4HB specs: 2.2L (134.3 ci) 4-cylinder, 85.4 x 96 mm (3.3622 x 3.7795 in) bore and stroke, 16:1 compression. Rated 200 hp. Rod ratio and piston speed.
The Hyundai D4HB is undersquare — the 3.7795" stroke exceeds the 3.3622" bore by 11.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7795" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.6 ci (550 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 2 engines in the R family, the largest at 134.3 ci. Factory fitments include the Hyundai Santa Fe, Kia Sorento, Kia Carnival and 1 other.
| Displacement | 134.3 ci / 2.2 L |
|---|---|
| Bore | 3.3622" |
| Stroke | 3.7795" |
| Cylinders | 4 |
| Compression ratio | 16:1 |
| Bore/stroke ratio | 0.89 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 200 hp |
| Bore/stroke character | 0.890 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,780 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.6 ci |
| Static compression | 16:1 — high enough that pump premium or better is normally required |
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