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The same engine also has a main page: Honda J-series V6 11.2:1.
Acura J37A specs: 3.7L (225.7 ci) 6-cylinder, 93 x 90.7 mm (3.6614 x 3.5709 in) bore and stroke, 11.2:1 compression. Rated 300 hp. Rod ratio and piston speed.
The Acura J37A is close to square: 3.6614" bore against 3.5709" stroke, within 2.5%, which splits the difference between a high-revving layout and a torque layout. The 3.5709" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 37.6 ci (616 cc).
11.2:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 10 engines in the Honda J-series family, the largest at 225.7 ci. Factory fitments include the Acura MDX, Acura RL, Acura TL and 1 other.
| Displacement | 225.7 ci / 3.7 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.5709" |
| Cylinders | 6 |
| Compression ratio | 11.2:1 |
| Bore/stroke ratio | 1.025 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 300 hp |
| Bore/stroke character | 1.025 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,571 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.6 ci |
| Static compression | 11.2:1 — high enough that pump premium or better is normally required |
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