See other engines in this family
Ram Viper 8.0 specs: 488 ci (8.0L) 10-cylinder, 4.00 x 3.878 in (101.6 x 98.5 mm) bore and stroke, 9.6:1 compression. Rated 300 hp. OHV.
The Ram Viper 8.0 is close to square: 4" bore against 3.878" stroke, within 3.1%, which splits the difference between a high-revving layout and a torque layout. The 3.878" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 10 cylinders displaces 48.8 ci (800 cc).
9.6:1 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 3 engines in the Viper family, the smallest at 488 ci. Factory fitments include the Ram 2500, Ram 3500.
| Displacement | 488 ci / 8 L |
|---|---|
| Bore | 4" |
| Stroke | 3.878" |
| Cylinders | 10 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.031 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 300 hp |
| Bore/stroke character | 1.031 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,878 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 48.8 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.