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Nissan VQ37VHR specs: 3.7L (225.8 ci) 6-cylinder, 95.5 x 86 mm (3.7598 x 3.3858 in) bore and stroke, 11:1 compression. Rated 330 hp. DOHC.
The Nissan VQ37VHR is oversquare — the 3.7598" bore exceeds the 3.3858" stroke by 11.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.6 ci (617 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 14 engines in the VQ family, sitting between the 121.9 ci and 243.8 ci members. Factory fitments include the Nissan 370Z, Infiniti G37, Infiniti M37 and 7 others.
| Displacement | 225.8 ci / 3.7 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 3.3858" |
| Cylinders | 6 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.11 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 330 hp |
| Bore/stroke character | 1.110 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.6 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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