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Honda D14A specs: 1.4L (85.4 ci) 4-cylinder, 75 x 79 mm (2.9528 x 3.1102 in) bore and stroke, 9.1:1 compression. Rated 75 hp. Rod ratio and piston speed.
The Honda D14A is undersquare — the 3.1102" stroke exceeds the 2.9528" bore by 5.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.1102" stroke does not reach 4,000 ft/min of mean piston speed until about 7,700 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 21.4 ci (350 cc).
9.1:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 19 engines in the D-series family, sitting between the 82 ci and 103.7 ci members. Factory fitments include the Honda Civic.
| Displacement | 85.4 ci / 1.4 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 3.1102" |
| Cylinders | 4 |
| Compression ratio | 9.1:1 |
| Bore/stroke ratio | 0.949 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 75 hp |
| Bore/stroke character | 0.949 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
| Displacement per cylinder | 21.4 ci |
| Static compression | 9.1:1 — low by modern standards, generally happy on regular pump fuel |
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