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Ram 47 Powertech V8 specs: 287 ci (4.7L) 8-cylinder, 3.661 x 3.413 in (93 x 86.7 mm) bore and stroke, 9:1 compression. Rated 235 hp. SOHC.
The Ram 47 Powertech V8 is oversquare — the 3.6614" bore exceeds the 3.4134" stroke by 7.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4134" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 35.9 ci (588 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 8 engines in the PowerTech family, the largest at 287 ci. Factory fitments include the Dodge Ram 1500, Dodge Dakota, Dodge Durango and 1 other.
| Displacement | 287 ci / 4.7 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.4134" |
| Cylinders | 8 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.073 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 235 hp |
| Bore/stroke character | 1.073 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.9 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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