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Infiniti VH41DE specs: 4.1L (252 ci) 8-cylinder, 93 x 76 mm (3.6614 x 2.9921 in) bore and stroke, 10.5:1 compression. Rated 266 hp. DOHC.
The Infiniti VH41DE is oversquare — the 3.6614" bore exceeds the 2.9921" stroke by 22.4% — a layout that favors airflow and RPM over leverage at the crank. The 2.9921" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 31.5 ci (516 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 3 engines in the VH family, the smallest at 252 ci. Factory fitments include the Infiniti Q45.
| Displacement | 252 ci / 4.1 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.9921" |
| Cylinders | 8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.224 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 266 hp |
| Bore/stroke character | 1.224 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 31.5 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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