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Honda D13B specs: 1.3L (82 ci) 4-cylinder, 75 x 76 mm (2.9528 x 2.9921 in) bore and stroke, 9.2:1 compression. Rated 82 hp. SOHC. Rod ratio and piston speed.
The Honda D13B is close to square: 2.9528" bore against 2.9921" stroke, within 1.3%, which splits the difference between a high-revving layout and a torque layout. The 2.9921" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 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).
9.2:1 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, the smallest at 82 ci. Factory fitments include the Honda Civic.
| Displacement | 82 ci / 1.3 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 2.9921" |
| Cylinders | 4 |
| Compression ratio | 9.2:1 |
| Bore/stroke ratio | 0.987 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 82 hp |
| Bore/stroke character | 0.987 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.5 ci |
| Static compression | 9.2:1 — low by modern standards, generally happy on regular pump fuel |
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