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Ram 37 Magnum specs: 226 ci (3.7L) 6-cylinder, 3.661 x 3.575 in (93 x 90.8 mm) bore and stroke, 9.7:1 compression. Rated 215 hp. Rod ratio and piston speed.
The Ram 37 Magnum is close to square: 3.6614" bore against 3.5748" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.5748" 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 37.7 ci (617 cc).
9.7:1 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 13 engines in the Magnum family, the smallest at 226 ci. Factory fitments include the Ram 1500.
| Displacement | 226 ci / 3.7 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.5748" |
| Cylinders | 6 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.024 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 215 hp |
| Bore/stroke character | 1.024 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,575 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.7 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
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