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Honda EV1 specs: 1.3L (81.9 ci) 4-cylinder, 74 x 78 mm (2.9134 x 3.0714 in) bore and stroke. Used in the Honda Civic. Rod ratio and piston speed worked out.
The Honda E-series (EV1) is undersquare — the 3.0714" stroke exceeds the 2.9134" bore by 5.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.0714" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 20.5 ci (336 cc).
It is one of 10 engines in the E-series family, the smallest at 81.9 ci.
| Displacement | 81.9 ci / 1.3 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.0714" |
| Cylinders | 4 |
| Bore/stroke ratio | 0.949 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.949 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.5 ci |
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1 factory vehicle, 1984–1987. Each year opens that model's engine table.