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Plymouth EDZ specs: 148 ci (2.4L) 4-cylinder, 3.445 x 3.976 in (87.5 x 101 mm) bore and stroke, 9.4:1 compression. Rated 150 hp. Rod ratio and piston speed.
The Plymouth Chrysler EDZ (EDZ) is undersquare — the 3.9764" stroke exceeds the 3.4449" bore by 13.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.9764" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 37.0 ci (606 cc).
9.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
2 factory variants share these dimensions, rated at 150 hp. Factory fitments include the Plymouth Breeze, Plymouth Voyager.
| Displacement | 148 ci / 2.4 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.9764" |
| Cylinders | 4 |
| Compression ratio | 9.4:1 |
| Bore/stroke ratio | 0.866 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150 hp |
| Bore/stroke character | 0.866 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,976 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.0 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 150 hp | EDZ |
| — | 150 hp | EDZ |