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Nissan L28ET specs: 2.8L (168 ci) 6-cylinder, 86 x 79 mm (3.3858 x 3.1102 in) bore and stroke, 7.4:1 compression. SOHC. Rod ratio and piston speed worked out.
The Nissan L28ET is oversquare — the 3.3858" bore exceeds the 3.1102" stroke by 8.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.1102" stroke does not reach 4,000 ft/min of mean piston speed until about 7,700 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 28.0 ci (459 cc).
Static compression of 7.4:1 is low 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 9 engines in the L-series family, the largest at 168 ci.
| Displacement | 168 ci / 2.8 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.1102" |
| Cylinders | 6 |
| Compression ratio | 7.4:1 |
| Bore/stroke ratio | 1.089 |
| Valvetrain | SOHC |
|---|---|
| Induction | turbocharged |
| Fuel type | gas |
| Bore/stroke character | 1.089 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.0 ci |
| Static compression | 7.4:1 — low by modern standards, generally happy on regular pump fuel |
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