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Honda ECA1 specs: 1.0L (61 ci) 3-cylinder, 72 x 81.5 mm (2.8346 x 3.2087 in) bore and stroke, 10.8:1 compression. Rated 73 hp, 2000–2006.
The Honda ECA1 is undersquare — the 3.2087" stroke exceeds the 2.8346" bore by 11.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2087" stroke does not reach 4,000 ft/min of mean piston speed until about 7,500 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 3 cylinders displaces 20.3 ci (333 cc).
10.8:1 is in the range that usually runs on pump premium.
7 factory variants share these dimensions, rated at 73 hp across 2000–2006.
| Displacement | 61 ci / 1 L |
|---|---|
| Bore | 2.8346" |
| Stroke | 3.2087" |
| Cylinders | 3 |
| Configuration | I3 |
| Compression ratio | 10.8:1 |
| Bore/stroke ratio | 0.883 |
| Fuel type | gas |
|---|---|
| Advertised HP | 73 hp |
| Years | 2000–2006 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2000 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2001 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2002 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2003 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2004 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2005 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
| 2006 | ECA1 net | 73 @ 5700 | 91 lb-ft @ 2000 | 10.8:1 |
Factory specification sheet.
| Bore/stroke character | 0.883 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,209 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.3 ci |
| Static compression | 10.8:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2000 | 73 hp | ECA1 |
| 2001 | 73 hp | ECA1 |
| 2002 | 73 hp | ECA1 |
| 2003 | 73 hp | ECA1 |
| 2004 | 73 hp | ECA1 |
| 2005 | 73 hp | ECA1 |
| 2006 | 73 hp | ECA1 |
1 factory vehicle, 2000–2006. Each year opens that model's engine table.