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Nissan R16 specs: 98 ci 4-cylinder, 87.2 x 66.8 mm (3.4331 x 2.6299 in) bore and stroke, 9:1 compression. Rated 96 hp, 1965–1970. Used in the Datsun Roadster.
The Nissan 98ci (R16) is oversquare — the 3.4331" bore exceeds the 2.6299" stroke by 30.5% — a layout that favors airflow and RPM over leverage at the crank. The 2.6299" stroke does not reach 4,000 ft/min of mean piston speed until about 9,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.5 ci (401 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Nissan 98ci family, all of them 98 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 96 hp across 1965–1970.
| Displacement | 98 ci |
|---|---|
| Bore | 3.4331" |
| Stroke | 2.6299" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.305 |
| Fuel type | gas |
|---|---|
| Advertised HP | 96 hp |
| Years | 1965–1970 |
| Bore/stroke character | 1.305 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,630 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.5 ci |
| Static compression | 9:1 — 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 |
|---|---|---|
| 1965 | — | R16 |
| 1966 | 96 hp | R16 |
| 1967 | 96 hp | R16 |
| 1968 | 96 hp | R16 |
| 1969 | 96 hp | R16 |
| 1970 | 96 hp | R16 |
1 factory vehicle, 1965–1970. Each year opens that model's engine table.