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Honda LDA specs: 1.3L (81.7 ci) 4-cylinder, 73 x 80 mm (2.8740 x 3.1496 in) bore and stroke, 10.8:1 compression. Rod ratio and piston speed worked out.
The Honda L-series (LDA) is undersquare — the 3.1496" stroke exceeds the 2.874" bore by 8.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.1496" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 20.4 ci (335 cc).
10.8:1 is in the range that usually runs on pump premium.
It is one of 8 engines in the L-series family, the smallest at 81.7 ci.
| Displacement | 81.7 ci / 1.3 L |
|---|---|
| Bore | 2.874" |
| Stroke | 3.1496" |
| Cylinders | 4 |
| Compression ratio | 10.8:1 |
| Bore/stroke ratio | 0.912 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.912 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.4 ci |
| Static compression | 10.8:1 — in the range that usually runs on pump premium |
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