See other engines in this family
The same engine also has a main page: Honda J-series V6 11.2:1.
Acura J37A4 specs: 3.7L (223 ci) 6-cylinder, 90 x 96 mm (3.5433 x 3.7795 in) bore and stroke, 11.2:1 compression. Rated 305 hp, 2009–2014.
The Acura J37A4 is undersquare — the 3.7795" stroke exceeds the 3.5433" bore by 6.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7795" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 37.2 ci (609 cc).
11.2:1 is high enough that pump premium or better is normally required.
6 factory variants share these dimensions, rated at 305 hp across 2009–2014.
| Displacement | 223 ci / 3.7 L |
|---|---|
| Bore | 3.5433" |
| Stroke | 3.7795" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 11.2:1 |
| Bore/stroke ratio | 0.938 |
| Fuel type | gas |
|---|---|
| Redline | 6,700 rpm (factory limit) |
| Advertised HP | 305 hp |
| Years | 2009–2014 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2009 | J37A4 net | 305 @ 6200 | 273 lb-ft @ 5000 | 11.2:1 |
| 2010 | J37A4 net | 305 @ 6300 | 273 lb-ft @ 5000 | 11.2:1 |
| 2011 | J37A4 net | 305 @ 6300 | 273 lb-ft @ 5000 | 11.2:1 |
| 2012 | J37A4 net | 305 @ 6300 | 273 lb-ft @ 5000 | 11.2:1 |
| 2013 | J37A4 net | 305 @ 6300 | 273 lb-ft @ 5000 | 11.2:1 |
| 2014 | J37A4 net | 305 @ 6300 | 273 lb-ft @ 5000 | 11.2:1 |
Factory specification sheet.
| Bore/stroke character | 0.938 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,780 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.2 ci |
| Static compression | 11.2:1 — high enough that pump premium or better is normally required |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2009 | 305 hp | J37A4 |
| 2010 | 305 hp | J37A4 |
| 2011 | 305 hp | J37A4 |
| 2012 | 305 hp | J37A4 |
| 2013 | 305 hp | J37A4 |
| 2014 | 305 hp | J37A4 |
1 factory vehicle, 2009–2014. Each year opens that model's engine table.