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Honda ED EM EW specs: 1.5L (90.8 ci) 4-cylinder, 74 x 86.5 mm (2.9134 x 3.4055 in) bore and stroke. Used in the Honda Civic. SOHC. Rod ratio and piston speed.
The Honda ED EM EW is undersquare — the 3.4055" stroke exceeds the 2.9134" bore by 14.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4055" 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 4 cylinders displaces 22.7 ci (372 cc).
It is one of 10 engines in the E-series family, sitting between the 81.9 ci and 97.6 ci members.
| Displacement | 90.8 ci / 1.5 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.4055" |
| Cylinders | 4 |
| Compression ratio | 7.9–9.2:1 (published figures vary) |
| Bore/stroke ratio | 0.855 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 0.855 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,406 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.7 ci |
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1 factory vehicle, 1984–1987. Each year opens that model's engine table.