Nissan RB25DE NEO Specs
Nissan RB25DE NEO engine specs: 152.4 ci (2.5L), 6-cylinder, 3.3858" bore x 2.8228" stroke, 10.5:1 compression.
Dimensions
| Displacement | 152.4 ci / 2.5 L |
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| Bore | 3.3858" |
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| Stroke | 2.8228" |
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| Cylinders | 6 |
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| Compression ratio | 10.5:1 |
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| Bore/stroke ratio | 1.199 |
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Construction
| Block material | cast iron |
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| Head material | aluminum |
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| Valvetrain | DOHC |
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| Fuel type | gas |
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| Advertised HP | 197 hp |
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What these numbers mean
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,823 ft/min — conservative for a street engine |
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| Displacement per cylinder | 25.4 ci |
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| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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