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Infiniti VK45DD specs: 4.5L (274.6 ci) 8-cylinder, 93 x 82.7 mm (3.6614 x 3.2559 in) bore and stroke, 11:1 compression. Rated 276 hp. DOHC.
The Infiniti VK45DD is oversquare — the 3.6614" bore exceeds the 3.2559" stroke by 12.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.2559" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 34.3 ci (562 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
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 Cima (Japan), Infiniti F50 Cima (Japan only), Infiniti Q45 (Japan).
| Displacement | 274.6 ci / 4.5 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.2559" |
| Cylinders | 8 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.125 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 276 hp |
| Bore/stroke character | 1.125 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,256 ft/min — conservative for a street engine |
| Displacement per cylinder | 34.3 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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