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Acura JNC1 specs: 3.5L (213.1 ci) 6-cylinder, 91 x 89.5 mm (3.5827 x 3.5236 in) bore and stroke, 10.5:1 compression. DOHC. Rod ratio and piston speed.
The Acura JNC1 is close to square: 3.5827" bore against 3.5236" stroke, within 1.7%, which splits the difference between a high-revving layout and a torque layout. The 3.5236" stroke puts mean piston speed at 4,000 ft/min around 6,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 35.5 ci (582 cc).
Static compression of 10.5:1 on aluminum heads is moderate for the displacement, which is deliberate on a boosted engine — the turbo supplies the rest of the effective ratio, and static compression plus boost together set the fuel requirement.
It is one of 10 engines in the Honda J-series family, sitting between the 182.9 ci and 225.7 ci members. Factory fitments include the Acura TLX Type S, Acura MDX Type S.
| Displacement | 213.1 ci / 3.5 L |
|---|---|
| Bore | 3.5827" |
| Stroke | 3.5236" |
| Cylinders | 6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.017 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Induction | twin-turbocharged |
| Fuel type | gas |
| Bore/stroke character | 1.017 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,524 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.5 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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