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Acura D17A specs: 1.7L (103.7 ci) 4-cylinder, 75 x 94.4 mm (2.9528 x 3.7165 in) bore and stroke, 9.9:1 compression. Rated 130 hp. Rod ratio and piston speed.
The Acura D17A is undersquare — the 3.7165" stroke exceeds the 2.9528" bore by 20.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7165" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 25.9 ci (425 cc).
9.9:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 5 engines in the Honda D-series family, the largest at 103.7 ci. Factory fitments include the Honda Civic, Acura EL.
| Displacement | 103.7 ci / 1.7 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 3.7165" |
| Cylinders | 4 |
| Compression ratio | 9.9:1 |
| Bore/stroke ratio | 0.795 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 130 hp |
| Bore/stroke character | 0.795 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,717 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 25.9 ci |
| Static compression | 9.9:1 — in the range that usually runs on pump premium |
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