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Honda A20A3 specs: 2.0L (119 ci) 4-cylinder, 82.7 x 91 mm (3.2559 x 3.5827 in) bore and stroke, 9.4:1 compression. Rated 110-120 hp, 1985–1989.
The Honda A20A3 is undersquare — the 3.5827" stroke exceeds the 3.2559" bore by 9.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5827" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 29.8 ci (488 cc).
9.4:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Honda 119ci family, all of them 119 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated from 110 to 120 hp across 1985–1989.
| Displacement | 119 ci / 2 L |
|---|---|
| Bore | 3.2559" |
| Stroke | 3.5827" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.4:1 * |
| Bore/stroke ratio | 0.909 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 110–120 hp |
| Years | 1985–1989 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1986 | A20A3 net | 110 @ 5500 | — | — |
| 1987 | A20A3 net | 110 @ 5500 | — | — |
Factory specification sheet.
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,583 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 29.8 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1985 | 110 hp | A20A3 |
| 1986 | 110 hp | A20A3 |
| 1987 | 110 hp | A20A3 |
| 1988 | 120 hp | A20A3 |
| 1989 | 120 hp | A20A3 |
2 factory vehicles, 1985–1989. Each year opens that model's engine table.