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Infiniti VK50VE specs: 5.0L (305.1 ci) 8-cylinder, 95.5 x 87.7 mm (3.7598 x 3.4528 in) bore and stroke, 10.9:1 compression. Rated 390 hp. DOHC.
The Infiniti VK50VE is oversquare — the 3.7598" bore exceeds the 3.4528" stroke by 8.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.4528" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 38.1 ci (625 cc).
10.9:1 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 9 engines in the VK family, sitting between the 274 ci and 341.7 ci members. Factory fitments include the Infiniti FX50, Infiniti QX70.
| Displacement | 305.1 ci / 5 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 3.4528" |
| Cylinders | 8 |
| Compression ratio | 10.9:1 |
| Bore/stroke ratio | 1.089 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 390 hp |
| Bore/stroke character | 1.089 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,453 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.1 ci |
| Static compression | 10.9:1 — in the range that usually runs on pump premium |
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